JP2848946B2 - Television signal processing circuit - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a signal processing circuit for television signals.

More specifically, regardless of whether the input television signal is a high-definition television signal or a current standard television signal, signal processing is performed for both cases to obtain a high-quality image. The present invention relates to a signal processing circuit that outputs a television signal as described above.

[Conventional technology]

In recent years, as television screens have become larger, higher quality of displayed images has been demanded. In response to this demand, various high-definition television systems are being studied. As a transmission system for high-definition television signals in Japan,
MUSE (Multiple Sub-Nyquist Sampling) developed by NHK
Encording) method is a typical example. Below, this M
The USE method will be described as an example.

The MUSE system is described in the document "NHK Technical Research Journal, Showa 62, Vol. 39, No. 2, 172, P18-P53".

This MUSE system uses 1125 scanning lines and a frame frequency of 30.
Hz interlaced scanning, high-definition television signals with a screen aspect ratio of 16: 9 (hereinafter referred to as 1125/30 signals), on the encoder side, in the moving picture, every other pixel every horizontal period In a still image, a band compression method is performed by multiplex sub-sampling in which pixels are thinned out every other pixel so as to make one cycle of two frames.

As a result, a still image signal band of 24 MHz and a moving image signal band of 16 M
It is possible to transmit a Hz signal after compressing the band to 8 MHz.

The 1125/30 signal (hereinafter referred to as M
The MUSE decoder that receives the USE signal) includes two signal processing circuits for still image processing and moving image processing, a motion detection circuit for determining a still image / moving image, a frequency conversion circuit, and the like. The signal is restored and a 1125/30 signal that can be displayed on a 16: 9 aspect ratio display is output.

In addition, a method of converting a MUSE signal into a signal that can be displayed on a current television receiver or a progressive scanning television receiver has been developed.

This MUSE signal has 525 scanning lines and a frame frequency of 30H.
z, interlaced scanning television signal (hereinafter 525/3
As a conventional example of a method of converting into a television signal of 525 scanning lines, a frame frequency of 60 Hz, and progressive scanning (hereinafter, referred to as a 525/60 signal), “Kasezawa et al. / NTSC converter "Technical Report of the Institute of Television Engineers of Japan, VOL.14, NO.8 pp13-18".

The MUSE / NTSC converter for EDTV described in this has the following two major features.

One is that it can convert 1125/30 signals to 525/60 signals and output them. Secondly, by using a frame memory, aliasing interference caused by band compression in the encoder is removed. Hereinafter, this converter will be described with reference to FIG.

FIG. 11 is a block diagram showing a conventional EDTV-compatible MUSE / NTSC converter.

In FIG. 11, 74 is an input terminal, 75 is an amplifier circuit, 76
Is an A / D converter, 77 is an automatic level control circuit (hereinafter referred to as ALC circuit), 78 is a nonlinear processing circuit, 7
9 is a frame memory, 80 is a horizontal low-pass filter (hereinafter referred to as a horizontal LPF), 81 is an aliasing removal circuit, 82 is a vertical low-pass filter (hereinafter referred to as a vertical LPF), 83 is a contour emphasis circuit, 84 , 89,90,91 are time axis conversion circuits, 85,92 are D /
The A converters 86, 87, 88, 93, 94 and 95 are output terminals.

The analog MUSE signal input from input terminal 74 is ALC
By controlling the amplification factor of the amplifier circuit 75 with a control signal from the circuit 77, the signal is supplied to the A / D converter 76 while keeping the signal level constant.

The MUSE signal converted to a digital signal by the A / D converter 76 is subjected to signal processing for returning a nonlinearly processed signal state to a linear state on the transmission side in a nonlinear processing circuit 78, so that transmission is performed by FM. , It is possible to remove the triangular noise generated.

Thereafter, the MUSE signal subjected to the non-linear processing is converted to a horizontal LPF 8
0 and supplied to the frame memory 79. The horizontal LPF 80 performs horizontal LPF processing on both the incoming signal and the signal delayed by one frame period in the frame memory 79.

The aliasing removal circuit 81 has a motion detection unit based on a difference between two frames and a mixing processing unit. In the mixing processing unit, the signal of the current frame for a moving image and the average value of the current frame for a still image and the previous frame are compared. The signal and the signal are mixed according to the motion detection signal. In the still image signal, the current frame and 1
By averaging the signal before the frame, aliasing interference caused by frame offset subsampling that occurs in band compression processing in the encoder can be removed.

After that, the vertical LPF 82 creates a 525/60 signal and a 525 scanning line signal whose scanning line center of gravity matches the MUSE signal having 1125 scanning lines. The contour emphasizing circuit 83 performs a process of emphasizing edges on the luminance signal output from the vertical LPF.

The time axis conversion circuit 84 of the next stage has a memory,
Write the incoming signal with a clock synchronized with the signal,
Read with a clock synchronized with the signal. With this process,
The incoming signal is output as a 525/60 signal.

Then, the 525/60 signal is input to the D / A converter 85,
It is converted to an analog signal. The 525/60 signal is also supplied to time axis conversion circuits 89, 90, 91. Time axis conversion circuit 8
In 9,90,91, the read frequency is converted to the above time axis conversion circuit 84.
By setting to 1/2 of the reading frequency of the signal and reading every other scanning line by interlaced scanning,
Create a 525/30 signal.

Then, the 525/30 signal is input to the D / A converter 92 and is converted into an analog signal.

[Problems to be solved by the invention]

The MUSE decoder in the above conventional example performs a moving image process and a still image process on each of the luminance signal and the color difference signal,
Since the signal processing is such that switching is performed depending on the presence or absence of image movement, the image quality is very high, but the circuit scale is very large.

The MUSE / NTSC converter for EDTV in the above conventional example has a smaller circuit size than the MUSE decoder, but in order to improve the image quality, the MUSE signal restoration processing or the aliasing component due to the frame offset sub-sampling of the still image. , A frame memory having a large circuit scale is used.

Furthermore, the MUSE decoder and the MUSE / NTSC converter compatible with EDTV are receivers that support only MUSE signals.
5/30 signal, the current standard television signal (eg NTSC
There is also a problem that the television signal cannot be received.

An object of the present invention is to solve the above-mentioned problem, realize a MUSE signal restoration process, and a conversion process to a 525/30 signal without using a frame memory, with a smaller circuit scale, and furthermore, a MUSE signal And a television signal processing circuit that can receive both standard and current standard television signals, convert any one of them to a 525/60 signal that can display high-quality images, and output it Is to do.

[Means for solving the problem]

To achieve the above object, according to the present invention, a MUSE signal is input, the MUSE signal is subjected to in-field signal processing, and a first television signal according to a current standard television signal scanning method and a current television signal. Down-conversion for generating at least a television signal in accordance with a standard television signal scanning method and a second television signal having an interlaced structure inverted with respect to each field with respect to the first television signal. Means for selectively inputting a current standard television signal and an output signal of the down-conversion means, and performing a process between frames or fields in accordance with the motion of an image; If the input signal is the same in-field processing and the output signal of the down-conversion means is input, the first television ® tone signal and a second television signal by respective video signal processing in the same field processing for combining, 52
An EDTV processor that outputs a 5/60 signal and a television signal processing circuit were configured.

[Action]

The down-conversion means receives the MUSE signal, performs signal processing in the field on both the signal processed by the still image on the transmission side and the signal processed by the moving image, restores the MUSE signal, and converts the signal to a 525/30 signal. And outputs two 525/30 signals with the scan line structure reversed for each field.

The EDTV processor selects the two 525/30 signals output from the down-conversion means when receiving the MUSE signal, and selects the current standard television signal when receiving the current standard television signal. Then, processing between frames (or fields) is performed on the still image signal, and processing within the field, that is, so-called motion adaptive type high quality processing is performed on the moving image signal, and a 525/60 signal is output.

As described above, by integrating the down-converting means and the EDTV processor, it is possible to cope with both the input signals of the MUSE signal and the current standard television signal.

Further, when the MUSE signal is received, the down-conversion means performs the signal processing only in the field, so that the decoding processing of the MUSE signal and the conversion processing to the 525/30 signal can be performed with a simple circuit configuration.

Furthermore, the aliasing component and the noise component in the still image of the MUSE signal can be suppressed by the still image inter-frame signal processing of the EDTV processor.

Furthermore, for the moving image of the MUSE signal, the first television signal and the second television signal created from the MUSE signal are re-synthesized by in-field processing of the EDTV processor to convert the 525/60 signal. Can be output.

As a result, aliasing components and noise components can be suppressed for still images, and the decrease in vertical resolution can be reduced for moving images, making it possible to display high-quality images of MUSE signals.
It can output 525/60 signals.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the description of this embodiment, an NTSC composite color television signal (hereinafter, referred to as a 525/30 color signal), which is a 525/30 signal, will be described as an example of a current standard television signal. In addition, a high-definition television signal and a transmission signal thereof will be described using an NHK 1125/30 signal and a MUSE signal as examples.

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a down-conversion means (hereinafter referred to as a down-conversion means).
2 is an EDTV processor, 3 is a motion adaptive luminance signal color signal separation circuit (hereinafter referred to as an adaptive YC separation circuit), and 4 is a motion adaptive scan line interpolation circuit (hereinafter, referred to as a down converter).
5 is a scanning line interpolation circuit, and 6 is a scanning line interpolation circuit.
Is a luminance signal color signal separating means in the field for a moving image signal (hereinafter referred to as moving image YC separating means), 7 is a moving image signal interpolation signal creating means (hereinafter referred to as moving image interpolating means), and 8 and 9 are input terminals. , 10, 15, 21, and 27 are selection circuits.

11 is a frame memory, 12 is an addition circuit, 13 is a subtraction circuit,
14 is a luminance signal chrominance signal separation circuit for a moving image signal in the field (hereinafter referred to as a moving image YC separation circuit), 16 is a motion detection circuit, 17, 18, and 22 are mixing circuits, 19 is a field memory, and 20 is a moving image signal. Interpolation signal creation circuit (hereinafter referred to as video interpolation circuit), 23 and 26 are double speed conversion circuits, 24 is color demodulation circuit, 25 is interpolation signal creation circuit (hereinafter referred to as interpolation circuit), and 28 and 29 are output terminals It is.

The input terminal 8 is connected to a current standard television signal.
A 525/30 color signal is input, and a MUSE signal is input to an input terminal 9.

First, the operation of this embodiment when a 525/30 color signal is input will be described. In this case, the selection circuits 10, 15, 21, and 27 having the two input terminals a and b all operate to select and output the signal on the a side (open circle side).

The 525/30 color signal from the input terminal 8 is
And is output as it is by the operation of the selection circuit 10. The 525/30 color signal output from the selection circuit 10 is
It is supplied to the motion detection circuit 16.

The motion detection circuit 16 uses the correlation between the frames,
The moving image portion and the still image portion of the image are discriminated, and a motion signal (Ks) for controlling the adaptive YC separation circuit 3 and a motion signal (Ki) for controlling the adaptive scanning line interpolation circuit 4 are output.

The motion detection circuit 16 generates a motion signal by performing temporal and spatial processing based on, for example, a signal obtained by processing a low-pass filter (hereinafter, referred to as an LPF) of an inter-frame difference signal. The LPF processing can limit the band to about 1.5 MHz or less so that the color signal component of the 525/30 color signal and the aliasing component in the still image of the MUSE signal do not affect the motion detection.

On the other hand, the 525/30 color signal from the selection circuit 10 is branched and supplied to the adaptive YC separation circuit 3.

In the adaptive YC separation circuit 3, first, the 525/30 color signal is supplied to the frame memory 11, the addition circuit 12, and the subtraction circuit 13, and a one-frame sum signal and a one-frame difference signal are created.

Here, in the 525/30 color signal, the phase of the color subcarrier is reversed in one frame due to the standard of the NTSC system, so that for a still image, the luminance is obtained by creating a one-frame sum signal. A color signal can be obtained by creating a signal and a difference signal between one frame.

In addition, taking the sum and difference between one frame suppresses noise components having no correlation between the frames. Therefore, the frame sum signal and the frame sum signal composed of the frame memory 11, the addition circuit 12, and the subtraction circuit 13 The difference signal creation unit
It also has a noise removal effect.

The output signal from the adding circuit 12 is a luminance signal for a still image (hereinafter, referred to as a Y signal for a still image (YF)), and the subtracting circuit 13
Is output as a still image color signal (hereinafter, referred to as a still image C signal (CF)) (here, YF, C
Note that capital letters are used as F in F).

On the other hand, the 525/30 color signal from the selection circuit 10 is further branched and supplied to the moving image YC separation means 6.

The moving image YC separation means 6 includes a moving image YC separation circuit 14 and a selection circuit 15, and an incoming signal is input to the moving image YC separation circuit 14 and the b side of the selection circuit 15.

In the YC separation circuit for video 14, the 525/30 color signal
The YC separation filter process in the field is performed, and a luminance signal for a moving image (hereinafter, referred to as a Y signal for a moving image (Yf)) and a color signal for a moving image (hereinafter, referred to as a C signal for a moving image (Cf)) are output. Note that the lowercase letters are used as f in Yf and Cf). The output moving image Y signal (Yf) is supplied to the selection circuit 15.
And is output as it is by the operation of the selection circuit 15.

The still image Y signal (YF) and the moving image Y signal (Yf) are input to the mixing circuit 17, and the still image C signal (CF) and the moving image C signal (Cf) are input to the mixing circuit 18. Enter

In each of the mixing circuits 17 and 18, the still image signal and the moving image signal are mixed so that the mixing ratio changes depending on the degree of movement of the motion signal (Ks) created by the motion detection circuit 16, and a luminance signal (hereinafter, referred to as a luminance signal). 525 / 30Y signal) and color signal (hereinafter 525 / 30Y signal)
/ 30C signal).

Here, the mixing circuits 17 and 18 mainly select and output the still image signal when the movement of the motion signal (Ks) is small, and mainly select the moving image signal when the movement of the motion signal (Ks) is large. Operate to select and output. This is seen in current television signal receivers. It is possible to prevent image quality deterioration such as dot disturbance or cross color caused by incomplete YC separation.

Next, the 525 / 30Y signal output from the mixing circuit 17 is supplied to the adaptive scanning line interpolation circuit 4.

In the adaptive scanning line interpolation circuit 4, the 525 / 30Y signal is first input to the field memory 19. The field memory 19 delays the Y signal by one field period and outputs the signal as a still image interpolation scanning line signal.

On the other hand, the 525 / 30Y signal output from the mixing circuit 17 is supplied to the moving image interpolation means 7. The moving image interpolation means 7 includes a moving image interpolation circuit 20 and a selection circuit 21.

The moving image interpolation circuit 20 generates and outputs an interpolated scanning line signal by calculating the average of the upper and lower two lines using, for example, a line memory. The moving image interpolation scanning line signal is input to the a side of the selection circuit 21, and is output as it is by the operation of the selection circuit 21.

The mixing circuit 22 inputs the still image interpolation scanning line signal and the moving image interpolation scanning line signal, and uses the motion signal (Ki) generated by the motion detection circuit 16 in the same manner as the mixing operation in the mixing circuits 17 and 18. Then, the two signals are mixed and output.

Thereafter, the output signal of the mixing circuit 17 is input to the double speed conversion circuit 23 as an actual scanning line signal of luminance (hereinafter, referred to as Y), and the output signal of the mixing circuit 22 is input as a Y interpolation scanning line signal. After time compression to 2, the actual scanning line signal and the interpolated scanning line signal are output alternately for each scanning line.
It outputs to the output terminal 28 as a luminance signal (hereinafter, referred to as a 525 / 60Y signal) of 525 scanning lines, a frame frequency of 60 Hz, and progressive scanning.

On the other hand, the 525 / 30C signal from the mixing circuit 18 is
Supplied to

The color demodulation circuit 24 demodulates the 525 / 30C signal modulated by the 3.58 MHz color subcarrier and outputs it as a baseband 525 / 30C signal.

The 525 / 30C signal output from the color demodulation circuit 24 is output to a scanning line interpolation circuit 5 comprising an interpolation circuit 25 and a double speed conversion circuit 26.
Is input to In the interpolation circuit 25, similarly to the video interpolation circuit 20, for example, an interpolation scanning line signal is created using a line memory.

Thereafter, in the double speed conversion circuit 26, the actual scanning line signal of the color (hereinafter referred to as C) output from the mixing circuit 18 and the interpolation scanning line signal of C from the interpolation circuit 25 are input, and the double speed conversion circuit 23 A double-speed conversion operation similar to the operation described above is performed, and a 525 scanning line, a frame frequency of 60 Hz, and a progressive scanning color signal (hereinafter, referred to as a 525 / 60C signal) are output.

Then, the 525 / 60C signal is input to the a side of the selection circuit 27, output as it is by the operation of the selection circuit 27, and output from the output terminal 29.

As a result, it is possible to obtain a high-quality image without deterioration in image quality such as line flicker and a decrease in vertical resolution due to interlaced scanning, which is observed in current receivers.

As described above, in the present embodiment, when a 525/30 color signal is input, the YC separation process and the scanning line interpolation process are performed according to the motion, so that the image quality degradation that occurs in the current standard speed television receiver is performed. And a 525/60 signal capable of displaying a high-quality image can be obtained.

Next, an operation in the present embodiment when a MUSE signal is input will be described. In this case, the selection circuits 10, 15, 21, 2
All 7 operate to select and output the signal on the b side (black circle side).

The MUSE signal input from the input terminal 9 is supplied to the downconverter 1.
Apply signal processing in the field to the signal,
Conversion to signals and 525/60 signals.

The detailed circuit operation of the down converter 1 will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of the downconverter 1. As shown in FIG.

In the figure, 1 is a down converter, 9 is an input terminal, 30 is a non-linear processing circuit, 31 is a field interpolation filter processing circuit (hereinafter, referred to as a two-dimensional filter), and 33 is a scanning line vertical centroid conversion filter (hereinafter, referred to as a two-dimensional filter). Vertical LPF), 34,
35 and 36 are speed conversion circuits, and 32, 37, 38 and 39 are output terminals.

The MUSE signal input to the input terminal 9 is first supplied to the nonlinear processing circuit 30. The non-linear processing circuit 30 performs a non-linear characteristic filtering process on the MUSE signal transmitted by FM modulation to reduce triangular noise due to FM transmission and a noise component that is conspicuous in a portion where the amplitude of the video signal is small.

Then, the MUSE nonlinearly processed by the two-dimensional filter 31
The signal is subjected to interpolation by a two-dimensional filter in the field. With this process, a 1125/30 signal is created and output.

1125/30 signal output from 2D filter 31 is vertical L
Supplied to PF33. The vertical LPF filter 33 creates, from the 1125/30 signal, a luminance signal and a chrominance signal in which the center of gravity of the scanning line in the vertical direction of the screen matches the 525/60 signal in the same field, and outputs them.

The 525/60 signal output from the vertical LPF 33, the luminance signal and the chrominance signal whose scanning line center of gravity is matched are supplied to the speed conversion circuit 34 and converted into 525/60 signals, respectively.
The 525 / 60Y signal is output to the speed conversion circuits 35 and 36, and the 525 / 60C signal is output to the output terminal 39.

In the speed conversion circuit 35, the number of scanning lines is reduced to 1/2 for the 525 / 60Y signal, the number of scanning lines is 525, and the frame frequency is 30H.
z, interlaced scanning television signal (525/30
−AY signal) and outputs it to the output terminal 37.

On the other hand, in the speed conversion circuit 36, the input 525 / 60Y signal is shifted from the timing of thinning out the scanning lines in the speed conversion circuit 35 by 1H (H is one horizontal scanning cycle) period of the 525/60 signal.
Decrease the number of signal scanning lines by half.

As a result, 525 / 30-AY output from the speed conversion circuit 35
A signal is an interlaced scanning television signal (hereinafter referred to as a 525 / 30-BY signal) in which the number of scanning lines is 525, the frame frequency is 30 Hz, and the scanning line structure is reversed in the same field.
Is generated and output to the output terminal 38.

Only by performing signal processing in the field in this way, 52
Since a 5/30 signal or a 525/60 signal is created, the MUSE signal can be decoded with a simple circuit configuration.

Here, the output signal of the two-dimensional filter 31 is output to an output terminal.
By extracting the color signals from the 32 and subjecting them to the time axis expansion processing of the color signals and the line-sequential decoding processing, 1125/30 signals to be output to a high-definition television display can be obtained.

As described above, the still image signal in the MUSE system is band-compressed by frame offset subsampling. For this reason, if decoding processing is performed on the MUSE signal by only the field interpolation processing as in the two-dimensional filter 31, there is a problem that aliasing interference in a still image portion cannot be removed and image quality deteriorates. This will be described with reference to FIG.

FIG. 3 shows 1125 output from the two-dimensional filter 31.
FIG. 10 is a diagram illustrating a distribution of aliasing components when the / 30 signal is a still image.

In the figure, the horizontal axis represents horizontal frequency, and the vertical axis represents time frequency. In the field interpolation processing in the two-dimensional filter 31, as shown in FIG. 3, a band limitation of about 16 MHz is performed in the horizontal frequency axis direction, but no band limitation is performed in the time axis frequency direction.

Therefore, the output signal includes all the aliasing components due to the frame offset sub-sampling such as a and b near the time frequency of 15 Hz and c and d near the 45 Hz in FIG. Therefore, the aliasing component appears as flicker interference on the screen.

As a countermeasure against this interference, the EDTV compatible MU shown in the conventional example
In the SE / NTSC converter, a frame memory is provided after the field interpolation processing to remove aliasing components.
In this embodiment, the aliasing component is removed by using the frame memory 7 in the EDTV processor 2 at the subsequent stage. The details will be described later.

FIG. 4 shows the scanning line structure (cross-sectional view of the scanning line) of the 525 / 60Y signal, FIG. 5 (A) shows the 525 / 30-AY signal, and FIG. 5 (B) shows the 525 / 30-BY signal.

4 and 5, the horizontal axis represents the time axis, and the vertical axis represents the vertical direction of the screen. For convenience of the following description, the M-th and M + 1-th lines on the screen are still image signals, and the M + 2 and M + 3 lines are moving-image signals.
A state in which the image information of the still image signal is constant irrespective of time change (Mth line: pixels a0 → a0 → a0, M + 1th line:
Pixels b0 → b0 → b0) Image state of moving image signal changes with time (M + 2 line: pixels c0 → c1 → c2, M + 3)
Line: pixels d0 → d1 → d2) are shown.

Also, it can be seen from FIG. 4 that the 525 / 60Y signal in FIG. 2 has a progressive scanning line structure. 5 (a) and 5 (b), the 525 / 30-A signal and the 525 / 30-
It can be seen that the B signals each have a scanning line structure of interlaced scanning, and that their phase relationship is reversed with respect to each other field by field.

The above is the operation of the down converter 1. The output signals from the output terminals 37, 38, and 39 are supplied to the EDTV processor 2 in FIG.

The 525 / 30-AY signal output from the output terminal 37 in FIG. 2 is input to the b side of the selection circuit 10 in FIG.
Is output as it is by the operation of.

First, the 525 / 30-AY signal output from the selection circuit 10 is
As in the case where the 525/30 color signal is input, the signal is supplied to the frame memory 11 and the addition circuit 12, and a one-frame sum signal is created.

Here, by taking the sum between one frame, it is possible to remove the aliasing component of the frame offset sub-sampling by the above-described field interpolation processing.

This will be described with reference to FIG. 6 and FIG.

FIG. 6 is a frequency characteristic diagram showing a signal pass band when a frame sum is obtained. In the figure, the horizontal axis represents the response, and the vertical axis represents the time frequency.

By taking the frame sum, the area indicated by α in FIG. 6 becomes the pass band, and the shaded area shown by β becomes the cutoff area.
Here, when FIG. 6 is compared with FIG. 3 described above, the frequency position where the aliasing component of the frame offset sub-sampling of the still picture signal exists, which is shown in FIG. Matches.

That is, by taking the sum between frames, it is possible to remove the aliasing component.

In addition, taking the sum between frames makes it possible to remove noise components for the same reason as when a 525/30 color signal is input.

Returning to FIG. On the other hand, 525 /
The 30-AY signal is branched and supplied to the moving image YC separation means 6. Since the selection circuit 15 included in the moving image YC separation means 6 selects the signal on the input terminal b side, the 525 / 30-AY signal is output as it is.

Then, in the mixing circuit 17, the 525/30 output from the adding circuit 12 from which the aliasing component and the noise component have been removed is removed.
-AY signal and 525/30 output from moving image YC separation means 6-
The AY signal is mixed and output according to the motion signal (Ks) from the motion detection circuit 16.

Thereafter, the output signal from the mixing circuit 17 is delayed by one field period by the field memory 19 and supplied to the mixing circuit 22.

On the other hand, 525 / 30-BY output from down converter 1
The signal is input to the b side of the selection circuit 21 in the moving image interpolation means 7, and is supplied to the mixing circuit 22 as it is by the operation of the selection circuit 21.

The mixing circuit 22 converts the two incoming signals into a motion detection circuit 16
Are mixed and output according to the motion signal (Ki).

Thereafter, the output signal from the mixing circuit 17 was input to the double speed conversion circuit 23 as a Y actual scanning line signal, and the output signal from the mixing circuit 22 was input as a Y interpolation scanning line signal. Then, the actual scanning line signal and the interpolation scanning line signal are
By outputting alternately for each scanning line, the signal is output to the output terminal 28 as a 525 / 60Y signal.

On the other hand, the 525 / 60C signal output from the down converter 1 is input to the b side of the selection circuit 27, output as it is by the operation of the selection circuit 27, and output from the output terminal 29 as a 525 / 60C signal.

The signal processing of the EDTV processor 2 when the MUSE signal is input will be described in more detail with reference to FIG. 7 and FIG.

(7-1) to (7-4) of FIG. 7 correspond to FIG.
The 525 / 30-AY signal and the 525 / 30-BY signal in FIG.
FIG. 3 shows a scanning line structure diagram of a signal of each circuit portion in the EDTV processor 2 when input to the TV processor 2.

In FIG. 7, for simplicity, as in FIG. 5, the M-th and M + 1-th lines are still image signals, and the M + 2 and M + 3 lines are moving image signals. The double circle signal indicates that the aliasing component and the noise component have been removed by the sum between frames.

In FIG. 1, a signal obtained by subjecting a 525 / 30-AY signal (the signal (a) in FIG. 5) to aliasing and noise components removal is input to a mixing circuit 17 as a still image signal. The signal (a) that has passed through the YC separation means 6 is input as a moving image signal. Then, they are mixed by the motion signal (Ks), and the output signal becomes the signal (7-1) in FIG.

Signal output from mixing circuit 17 (FIG. 7 (7-1))
Is delayed by one field period by the field memory 19 to become a signal (7-2). The signal output from the field memory 19 ((7-
2)) is input as a still image signal and passed through the selection circuit 21
The 525 / 30-BY signal (the signal (b) in FIG. 5) is input as a moving image signal.

Then, they are mixed by the motion signal (Ki), and the output signal becomes the signal of FIG. 7 (7-3). Then, the mixing circuit 17
7 (7-1) is input to the double speed conversion circuit 23 as an actual scanning line signal, and the signal of FIG. 7 (7-3) from the mixing circuit 22 is input as an interpolation scanning line signal. Then, interpolation processing is performed by the double speed conversion circuit 23, and the output is the 525 / 60Y signal of FIG. 7 (7-4).

The signal shown in FIG. 7 (7-4) is added to the still image signal of the 525 / 60Y signal output from the double speed conversion circuit 34 (FIG. 2) shown in FIG. The signal has been subjected to the removal processing and the noise component removal processing.

That is, once the 525 / 60Y signal created by the downconverter 1 is converted into a 525 / 30-AY signal and a 525 / 30-BY signal and processed by the EDTV processor 2, a still image has aliasing components, 525 / 60Y signals can be obtained with high image quality without removing noise and noise components and without lowering the resolution of moving images.

By the way, the moving image YC in the present embodiment shown in FIG.
As described above, the separating means 6 includes the moving image YC separating circuit 14 and the selecting circuit 15, but is not limited to this structure.

The reason for using the selection circuit 15 here is that the YC separation circuit for video
If 14 is, for example, a simple line comb filter, the MU
This is because, when the SE signal is input, the vertical resolution of the moving image signal is prevented from being reduced by the line comb filter processing.

On the other hand, the moving image YC separation circuit
JP-A-63-142792 discloses an in-field vertical correlation adaptive comb filter (hereinafter referred to as an adaptive comb filter) that detects a plurality of vertical correlations and performs a comb filter process between signals having a low vertical resolution. ) Does not significantly degrade the vertical resolution of the moving image.

Therefore, if a slight reduction in resolution is allowed, the selection circuit 15
, And the moving image YC separation means 60 can be realized with a circuit configuration including only an adaptive comb filter.

As described above, in the present embodiment, when the MUSE signal is received, the downconverter 1 performs signal processing only within the field, so that the MUSE signal is decoded with a small circuit scale and converted into a 525/30 signal. Processing can be performed.

In addition, by integrating the down converter 1 and the EDTV processor 2, the MUSE signal and the current standard television signal (525/30
Color signal).

Furthermore, since the aliasing component and the noise component in the still image of the MUSE signal can be suppressed by the still image inter-frame signal processing of the EDTV processor 2, a 525/60 signal capable of reproducing a high-quality image can be created. .

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 8 is a block diagram showing another embodiment of the present invention.

The present embodiment is characterized in that the removal processing of the still image aliasing component of the MUSE signal and the noise removal processing, which are the features of the embodiment of FIG. 1, are performed not only on the Y signal but also on the C signal.

8, reference numeral 40 denotes a down converter, 41 denotes an EDTV processor, 42 denotes a motion adaptive luminance signal separation circuit (hereinafter referred to as an adaptive Y separation circuit), and 43 denotes a motion adaptive color signal separation circuit (hereinafter referred to as adaptive C separation). Reference numeral 44 denotes a motion adaptive scanning line interpolation circuit (hereinafter, referred to as an adaptive scanning line interpolation circuit), and reference numeral 45 denotes a color signal demodulation circuit (hereinafter, referred to as a color demodulation circuit).

46, 52, 57 and 61 are selection circuits, 47 is a luminance signal separating means for moving picture signal in the field (hereinafter referred to as moving picture Y separating means), and 48 is a color signal separating circuit for moving picture signal in the field (hereinafter referred to as moving picture). C is a C separation circuit), 49 is a moving image interpolation means,
Reference numeral 50 denotes a motion detection circuit, and reference numeral 51 denotes a moving image signal in-field luminance signal separation circuit (hereinafter, referred to as a moving image Y separation circuit).

53, 58, and 62 are mixing circuits, 54 is a frame memory, 55 is an addition circuit, 56 is a color signal separation circuit in a field for a moving image signal (hereinafter, referred to as a moving image CY separation circuit), 59 is a field memory, and 60 is a moving image. 1 is a double-speed conversion circuit, 64 is an output terminal, and the same reference numerals as those shown in FIG. 1 denote the same or corresponding parts.

The input terminal 8 receives a 525/30 color signal, and the input terminal 9 receives a MUSE signal.

First, in the present embodiment, as in the previous embodiment of FIG. 1, the operation when a 525/30 color signal is input will be described. In this case, the selection circuits 10, 2 having two input terminals a, b
1, 46, 52, 57 and 61 all operate to select and output the signal on the a side (open circle side).

The 525/30 color signal input from the input terminal 8 is input to the a side of the selection circuit 10 and output as it is by the operation of the selection circuit 10.

The 525/30 color signal input from the input terminal 8 is supplied to the branched color demodulation circuit 45. Here, the operation of the color demodulation circuit 45 will be described with reference to FIG.

FIG. 9 is a block diagram showing details of the color demodulation circuit 45. In FIG. 9, 45 is a color demodulation circuit, 65 is an input terminal,
66 is a band pass filter (hereinafter referred to as BPF), 67 is an automatic color saturation control amplifier circuit (hereinafter referred to as ACC circuit), 68
Is a demodulation circuit, and 69 is an output terminal.

The 525/30 color signal input from input terminal 65 is
The band is limited at 6, and a signal in the color signal band is output. Then, the ACC circuit 67 operates to keep the level of the burst signal included in the output signal of the BPF 66 constant, and outputs a color signal of almost constant amplitude in which the fluctuation of the color signal level due to the frequency characteristic of the transmission path is corrected. I do.

Thereafter, the demodulation circuit 68 performs demodulation processing on the signal of the color signal band output from the ACC circuit 67, and outputs
Output to

As described above, the phase of the color subcarrier is inverted between one frame, but the demodulation circuit 68 is configured to cancel the inversion. In addition, the demodulation circuit 68 includes a high-frequency component of a luminance signal in addition to the color signal in the input signal of the color signal band. Therefore, the demodulated chrominance signal output from the demodulation circuit 68 includes a signal in which the high frequency component of the luminance signal is inverted in one frame.

Returning to FIG. An output signal from the color demodulation circuit 45 (hereinafter, referred to as a demodulated color signal) is input to the a side of the selection circuit 46, and is output as it is by the operation of the selection circuit 46.

In the motion detection circuit 50, in addition to the 525/30 color signal from the selection circuit 10, the demodulated color signal from the selection circuit 46 is also input.

Using the two signals, the moving image portion and the still image portion of the image are determined from the correlation between the frames, and the adaptive Y separation circuit 42
And a motion signal (Ks) for controlling the adaptive C separation circuit 43 and a motion signal (Ki) for controlling the adaptive scanning line interpolation circuit 4 and the adaptive scanning line interpolation circuit 44.

For example, the LPF is added to the difference signal between one frame of the 525 / 30-AY signal.
The processed signal and the difference signal between the two frames of the 525 / 30-AC signal are synthesized, and a motion signal is created by performing a filtering process in a time and space manner.

As described above, the motion detection circuit 50 in the present embodiment
Since the motion is detected using the features of the signal and the C signal, more accurate motion determination can be performed.

The 525/30 signal from the selection circuit 10 is branched and supplied to the adaptive Y separation circuit 42. 525 / in adaptive Y separation circuit 42
The 30-color signal is subjected to inter-frame sum processing by the frame memory 11 and the adding circuit 12 in the same manner as in the previous embodiment, and is output from the adding circuit 12 as a Y signal (YF) for a still image.

On the other hand, the 525/30 color signal from the selection circuit 10 is branched and supplied to the moving image Y separation means 47. The moving image Y separating means 47 includes a moving image Y separating circuit 51 and a selecting circuit 52,
The incoming signal is input to the moving image Y separation circuit 51 and the b side of the selection circuit 52.

The moving image Y separation circuit 51 performs a Y separation filter process in the field on the 525/30 color signal, and outputs a moving image Y signal (Yf). The output moving image Y signal (Yf) is input to the a side of the selection circuit 52, and is output as it is by the operation of the selection circuit 52.

The Y signal for still image (YF) output from the adding circuit 12 and the Y signal for moving image (Yf) output from the Y separator 47 for moving image are mixed in the mixing circuit 53 as in the previous embodiment. Output as a 525 / 30Y signal.

Thereafter, the 525 / 30Y signal from the adaptive Y separation circuit 42 is supplied to the adaptive scanning line interpolation circuit 4 in the same manner as in the previous embodiment, and the video memory interpolation means comprising the field memory 19, the video interpolation circuit 20 and the selection circuit 21. 7 and processed by the mixing circuit 22 and the double speed conversion circuit 23, and output to the output terminal 28 as a 525 / 60Y signal.

On the other hand, the demodulated color signal from the selection circuit 46 is branched and
It is supplied to the adaptive C separation circuit 43. In the adaptive C separation circuit 43, the demodulated chrominance signal output from the selection circuit 46 is first supplied to a frame memory 54 and an addition circuit 55 to generate a one-frame sum signal.

Here, as described above, since the phase of the high-frequency component of the luminance signal is reversed in one frame of the demodulated chrominance signal, the C signal for still image (CF ) Can be obtained. In addition, obtaining the sum between one frame has a noise removing effect as in the case of the frame memory 11 and the addition circuit 12.

On the other hand, the demodulated color signal from the selection circuit 46 is branched and
Further, it is supplied to the moving image C separating means 48.

The moving image C separating means 48 includes a moving image C separating circuit 56 and a selecting circuit 57, and an incoming signal is input to the moving image C separating circuit 56 and the b side of the selecting circuit 57. The moving image C separation circuit 56 performs a C separation filter process in the field on the demodulated color signal, and outputs a moving image C signal (Cf).

The outputted moving image C signal (Cf) is input to the a side of the selection circuit 57, and is output as it is by the operation of the selection circuit 57. Then, the still image C signal (CF) output from the addition circuit 55
And the moving image C signal (C
f) is mixed in mixing circuit 58 in the same way as mixing circuit 53,
Output as / 30C signal.

In the present embodiment, in the C scan line interpolation process, similarly to the Y scan line interpolation process by the adaptive scan line interpolation circuit 4,
An adaptive scanning line interpolation circuit 44 is used.

The 525 / 30C signal output from the adaptive C separation circuit 43 is supplied to the adaptive scanning line interpolation circuit 44. Adaptive scanning line interpolation circuit 44
In, the 525 / 30C signal is first input to the field memory 59. The field memory 59 delays the 525 / 30C signal by one field period and outputs it as a still image interpolation scanning line signal.

On the other hand, the 525 / 30C signal has a moving image interpolation circuit 60 and a selection circuit 6
This is supplied to the moving image interpolation means 49 comprising 1. The moving image interpolation circuit 60 generates and outputs an interpolated scanning line signal by using a line memory, for example, and calculating the average of the upper and lower two lines.

The moving image interpolation scanning line signal is input to the a side of the selection circuit 61, and is output as it is by the operation of the selection circuit 61. Then, the mixing circuit 62 receives the still image interpolation scanning line signal and the moving image interpolation scanning line signal, and uses the motion signal (Ki) created by the motion detection circuit 50 in the same manner as the mixing operation in the mixing circuit 22. The two signals are mixed and output.

Thereafter, the output signal of the mixing circuit 58 is input to the double speed conversion circuit 63 as an actual scanning line signal of C, and the output signal of the mixing circuit 62 is input as an interpolation scanning line signal of C. By alternately outputting the actual scanning line signal and the interpolation scanning line signal for each scanning line, the signal is output to the output terminal 64 as a 525 / 60C signal.

Thereby, the vertical resolution of the 525 / 60C signal can be improved as compared with the previous embodiment.

As described above, when a 525/30 color signal is input, it is possible to prevent the image quality deterioration occurring in the current standard speed television receiver as in the previous embodiment.

In addition, the 525/60 signal that can display a higher quality image can be displayed because the interpolation scanning line signal generation processing that adapts to the motion is applied to both the Y signal and the C signal to suppress image quality disturbance such as line flicker of the C signal. Can be obtained.

Next, the operation of this embodiment when the MUSE signal is input will be described. In this case, the selection circuits 10, 21, 4
6, 52, 57 and 61 all operate to select and output the signal on the b side (black circle side).

The MUSE signal input from the input terminal 9 is subjected to in-field signal processing by the down converter 40 as in the previous embodiment, and is converted into a 525/30 signal.

The detailed circuit operation of the down converter 40 in this embodiment will be described with reference to FIG.

FIG. 10 is a block diagram showing details of the down converter 40 in the present embodiment. In the figure, 40 is a down converter, 70 and 71 are speed conversion circuits, 72 and 73 are output terminals,
In addition, the same reference numerals as those shown in FIG. 2 indicate the same or corresponding parts.

In FIG. 10, the MUSE signal input from the input terminal 9 includes a non-linear processing circuit 30, a two-dimensional filter 31, a vertical LPF 33, and a speed conversion circuit 3, as in the down converter 1 of FIG.
4 converts the signal into a 525 / 60Y signal and a 525 / 60C signal.

The 525 / 60Y signal is supplied to the speed conversion circuits 35 and 36, and the output terminal 35 outputs a 525 / 30-AY signal and the output terminal 36 outputs a 525 / 30-BY signal. In the down converter 40 in the present embodiment, a conversion process of a 525 / 60C signal into a 525/30 signal is also performed.

The 525 / 60C signal output from the speed conversion circuit 34 is supplied to the speed conversion circuits 70 and 71. In the speed conversion circuit 70, 52
For the 5 / 60C signal, similar to the speed conversion circuit 35, the number of scanning lines is reduced to 1/2, the number of scanning lines is 525, and the frame frequency is 30H.
z, interlaced scanning television signal (525/30
−AC signal) and outputs it to the output terminal 72.

On the other hand, in the speed conversion circuit 71, similarly to the speed conversion circuit 36, the timing of thinning out the scanning lines in the speed conversion circuit 7 is as follows.
At a timing shifted by 1H (H is one horizontal scanning cycle) period of the 525/60 signal, the scanning line of the input 525 / 60C signal is thinned to 1/2.

As a result, the 525 / 30-AC output from the speed conversion circuit 71
525 scanning lines, frame frequency 30 Hz, interlaced scanning television signal (hereinafter referred to as 525 / 30-BS signal) such that the scanning line structure is reversed in the same field as the signal.
Is generated and output to the output terminal 73.

The above is the operation of the down converter 40 in the present embodiment. Then, the output signals of the output terminals 37, 38, 72, 73 are respectively supplied to the EDTV processor 41 of FIG.

The 525 / 30-AY signal output from the output terminal 37 in FIG. 10 is selected by the selection circuit 10 in FIG.

After that, the signal is supplied to the adaptive Y separation circuit 42, and the frame memory 11 and the addition circuit 12 remove the aliasing component of the frame offset sub-sampling by the sum of one frame and remove the noise component in the same manner as in the previous embodiment. And output from the adder circuit 12.

The 525 / 30-AY signal from the selection circuit 10 is branched and supplied to the moving image Y separating means 47. And this video Y
By the operation of the selection circuit 52 of the separation means 47, 525 / 30−
The AY signal is output as it is.

On the other hand, the 525 / 30-AC output from the output terminal 72 of FIG.
The signal is supplied to the b side of the selection circuit 46 in FIG.
It is output as it is by the operation of the selection circuit 46.

Thereafter, the signal is supplied to the adaptive C separation circuit 43, and the frame memory 54 and the addition circuit 55 remove the aliasing component of the frame offset sub-sampling by the sum of one frame in the same manner as the operation of the frame memory 11 and the addition circuit 12. , And a noise component is removed, and is output from the addition circuit 55.

The 525 / 30-AC signal from the selection circuit 46 is branched and supplied to the moving picture C separating means 48. And this movie C
By the operation of the selection circuit 54 of the separation means 48, 525 / 30−
The AC signal is output as it is.

The motion detection circuit 50 receives the 525 / 30-AY signal from the selection circuit 10 and the 525 / 30-AC signal from the selection circuit 46, detects the motion of the image from both signals, and generates a motion signal (Ks ) And a motion signal (Ki).

Like the case where the 525/30 color signal is input, the motion detection circuit 50 can detect more accurate motion even when the MUSE signal is input as compared with the motion detection circuit 16 of the previous embodiment. Become.

The mixing circuit 53 receives the output signal from the adding circuit 12 and the output signal from the moving image Y separating means 47, and the mixing circuit 58 outputs the output signal from the adding circuit 55 and the moving image C separating signal. The output signal from the means 48 is input. Then, the mixing circuits 53 and 58 mix the two incoming signals in accordance with the motion signal (Ks) as in the case of inputting the 525/30 color signal.

Thereafter, in the same manner as in the previous embodiment, in the adaptive scanning line interpolation circuit 4, the output signal from the mixing circuit 53 and the 525 / 30-BY signal from the down converter 40 are stored in the field memory 1
9, processed by the selection circuit 21, the mixing circuit 22, and the double speed conversion circuit 23.

As a result, a 525 / 60Y signal obtained by subjecting the still image signal to the aliasing component removal processing of the frame offset subsampling and the noise component removal processing can be obtained from the output terminal 20.

In this embodiment, the conversion processing to the 525/60 signal by the adaptive scanning line interpolation circuit 44 is also performed on the C signal processing system, similarly to the Y signal processing system.

The output signal from the mixing circuit 58 is delayed by one field period by the field memory 59 and supplied to the mixing circuit 62.

On the other hand, 525 / 30-BC output from down converter 40
The signal is input to the b side of the selection circuit 61, and is supplied to the mixing circuit 62 as it is by the operation of the selection circuit 61.

The mixing circuit 62 converts the two incoming signals into a motion detection circuit 50
Are mixed and output according to the motion signal (Ki).
Thereafter, the output signal from the mixing circuit 58 was input to the double-speed conversion circuit 63 as an actual scanning line signal of C and the output signal from the mixing circuit 62 as an interpolation scanning line signal of C, and time-compressed to 1/2. Thereafter, the actual scanning line signal and the interpolated scanning line signal are alternately output for each scanning line, and output to the output terminal 64 as a 525 / 60C signal.

As a result, similarly to the 525 / 60Y signal obtained from the output terminal 28, a 525 / 60C signal is obtained by subjecting the still image signal to the aliasing component removal processing of the frame offset subsampling and the noise component removal processing. Can be.

As described above, the moving image Y separation means 47 in the present embodiment includes the moving image Y separation circuit 51 and the selection circuit 52, but is not limited to this structure. As in the case of the moving image YC separation means 6 of the previous embodiment, if, for example, an adaptive comb filter is used in the moving image Y separation circuit 50, the vertical resolution of the moving image when the MUSE signal is input does not significantly deteriorate.

Therefore, if a slight reduction in resolution is allowed, the selection circuit
The moving image Y separation means 47 can be realized with a circuit configuration including only an adaptive comb filter without requiring the 52. The same applies to the moving image C separating means 48.

As described above, in the present embodiment, similarly to the previous embodiment, when the MUSE signal is received, the down converter 40 performs the signal processing only in the field, so that the decoding process of the MUSE signal can be performed with a small circuit scale. Conversion processing to 525/30 signals can be performed.

By integrating the down converter 40 and the EDTV processor 41, the MUSE signal and the current standard television signal (525/30
Color signal).

Furthermore, the aliasing component and the noise component of both the Y signal and the C signal in the still image of the MUSE signal can be suppressed by the still image signal processing of the EDTV processor 41, and transmitted for the moving image of the MUSE signal. Since a 525/60 signal without a decrease in vertical resolution can be created from the field signal as it is, a 525/60 signal capable of reproducing a higher quality image can be created.

In the above two embodiments, the configuration in which the output of the moving image interpolation circuit and the output of the down converter are selected has been described, but the present invention is not limited to this configuration. Basically, any configuration can be used as long as the 525/60 signal can be created by using the in-field information almost as it is during MUSE moving image processing.

For example, it is also possible to increase the number of mixing circuits by another, and to provide a mixing circuit for the 525/30 color signal and a mixing circuit for the MUSE signal independently and then select them. Even with such a configuration, the effect of the invention is not changed.

Further, in the above embodiments, the NTSC signal and the MUSE
Although the description has been made by taking the signal as an example, the present invention is not limited to this.

Supports standard color television signals with 625 scanning lines, frame frequency of 50 Hz, interlaced scanning, and high-definition television signals with scanning line structures other than 1125/30 signals, such as the PAL system. Is possible.

In this case, the vertical LP
The method can be applied by changing the method of matching the vertical center of gravity by F33 and changing the operating frequency of the speed conversion circuit.

〔The invention's effect〕

According to the present invention, when the MUSE signal is received, the down converter performs signal processing only in the field,
MUSE signal decoding and 525/30 with small circuit size
Conversion into a signal can be performed.

By integrating the down converter and EDTV processor, it can handle both MUSE signal and current standard television signal (525/30 color signal) input.

Furthermore, since the aliasing component and noise component in the still image of the MUSE signal can be suppressed by the still image signal processing of the EDTV processor, it is possible to create a 525/60 signal that reproduces a high-quality image. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing a specific circuit example of a down converter in FIG. 1, and FIG. 3 is a static circuit generated by a two-dimensional filter in FIG. FIG. 4 is a characteristic diagram showing aliasing components of an image signal,
FIG. 5, FIG. 5 is a scanning line structure diagram for explaining the signal processing of the down converter of FIG. 2, FIG. 6 is a characteristic diagram showing a pass band of a signal by the sum between frames, and FIG.
FIG. 8 is a block diagram showing another embodiment of the present invention. FIG. 9 is a block diagram showing another embodiment of the present invention.
FIG. 10 is a block diagram showing a specific circuit example of the color demodulation circuit in FIG. 10, FIG. 10 is a block diagram showing a specific circuit example of the down converter in FIG. 8, and FIG.
FIG. 3 is a block diagram showing an SE / NTSC converter. Explanation of reference numerals 1,40 …… Down converter, 2,41 …… EDTV processor,
3 ... Adaptive YC separation circuit, 4,44 ... Adaptive scanning line interpolation circuit,
5: Scanning line interpolation circuit, 6: YC separation means for video, 7,49
…… Movie interpolating means, 8,9,65,74 …… Input terminals, 10,15,2
1, 27, 46, 52, 57, 61 ... selection circuit, 11, 54, 79 ... frame memory, 12, 55 ... addition circuit, 13 ... subtraction circuit, 14 ...
YC separation circuit for video, 16,50 …… Motion detection circuit, 17,18,22,
53,58,62 …… mixed circuit, 19,59 …… Field memory, 2
0,60 …… Video interpolator, 23,26,63 …… Double speed converter,
24,45 ... Color demodulation circuit, 25 ... Interpolation circuit, 28,29,32,37,3
8,39,64,69,72,73,86,87,88,93,94,95 …… Output terminals, 3
0,78 …… Non-linear processing circuit, 31 …… 2D filter, 32,8
2… Vertical LPF, 34,35,36,70,71 …… Speed conversion circuit, 42…
... Adaptive Y separating circuit, 43 ... Adaptive C separating circuit, 47 ... Moving Y separating means, 48 ... Moving C separating means, 51 ... Moving Y separating means, 56 ... Moving C separating circuit, 66 …… BPF, 67
… ACC circuit, 68… Demodulation circuit, 75… Amplifier circuit, 76
…… A / D converter, 77 …… ALC circuit, 80 …… Horizontal LPF, 81…
… Flap elimination circuit, 83 …… Outline emphasis circuit, 84,89,90,9
1… Time axis conversion circuit, 85,92… D / A converter.

Continued on the front page (72) Inventor Kenji Katsumata 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Home Appliances Research Laboratory, Hitachi, Ltd. In the laboratory (58) Field surveyed (Int. Cl. ⁶ , DB name) H04N 7/01

Claims (5)

(57) [Claims] 1. A television signal which selectively receives a high-definition television signal and a standard television signal, and generates and outputs a progressive scanning television signal which is double-speed-converted by signal processing, regardless of which is input. When a high-definition television signal is input to the processing circuit, the high-definition television signal is subjected to in-field signal processing, thereby processing the first television signal (525) in accordance with the standard television signal scanning method. / 30-A) and a second television signal which is a television signal in accordance with a standard television signal scanning method, wherein the interlacing structure is inverted with respect to each field with respect to the first television signal. (52
5 / 30-B), and a down-converting means (1) for outputting at least a standard television signal and an output signal of the down-converting means. Still image signal processing performed between the first television signal and the first television signal when the output signal of the down-converting means is input by the same intra-field processing when a standard television signal is input. The moving image signal processing and the moving image signal processing performed by the same intra-field processing for synthesizing the second television signal are performed in accordance with the motion of the image to generate a double-speed converted progressively scanned television signal (525/60). A television signal processing circuit comprising: an EDTV processor (2) for outputting a signal; 2. The television signal processing circuit according to claim 1, wherein said down-converting means (1) performs signal processing in a field on the input high-definition television signal, thereby obtaining a standard television signal. The first along the scanning method of
The relationship between the television luminance signal (525 / 30-A) and the first television luminance signal according to the scanning method of the standard television signal, wherein the interlace structure is reversed for each field. And a circuit for outputting a second television luminance signal (525 / 30-B) and a progressive scanning television color signal (525/60). A first selection circuit (10) that receives a signal and a first television luminance signal from the down-converting means, selects and outputs one of the signals, and an output of the first selection circuit (10). A motion detection circuit (16) for detecting and outputting motion of an input image; and an output of the first selection circuit (10) being input and performing processing between frames to perform a luminance signal (Yf) and a color signal (CF). ) To separate and output frames Luminance signal and color signal separating means (11, 12,
13) and an in-field luminance signal / color signal separation unit (/) which receives the output of the first selection circuit (10), performs in-field processing, separates and outputs a luminance signal (YF) and a chrominance signal (Cf). 6)
And according to a motion detection signal from the motion detection circuit (16),
The output signal from the inter-frame luminance signal color signal separation means (11, 12, 13) and the output signal from the intra-field luminance signal color signal separation means (6) are mixed (17, 18) to produce a luminance signal (17, 18). A motion-adaptive luminance signal color signal separation circuit (3) for adaptively separating and outputting Y) and a color signal (C); and a luminance signal output from the motion-adaptive luminance signal color signal separation circuit (3). (Y), and performs intra-field processing to generate and output an interpolated scanning line. An intra-field interpolated scanning line generating circuit (20), an output signal from the intra-field interpolated scanning line generating circuit (20), and the down signal. An intra-field interpolation scanning line creation means (7) comprising a second selection circuit (21) which receives the second television luminance signal from the conversion means and selects and outputs one of them; Type luminance signal color signal separation circuit ( ), An inter-field interpolation scanning line means (19) for generating an inter-field interpolation scanning line by delaying the luminance signal (Y) output by one field period and outputting the signal, and According to the motion detection signal of
A mixing circuit (22) for mixing and outputting an output signal from the inter-field interpolation scanning line means (19) and an output signal from the intra-field interpolation scanning line creation means (7); and the mixing circuit (22). And the luminance signal (Y) output from the motion adaptive luminance signal color signal separation circuit (3).
, A double-speed conversion circuit (23) for generating and outputting a double-speed-converted progressive scanning television luminance signal, and a color signal output from the motion adaptive luminance signal color signal separation circuit (3). Demodulation circuit (2
4) and a scanning line interpolation circuit that receives the output signal from the demodulation circuit (24), creates an interpolated scanning line, and uses it to create and output a double-speed converted progressive scanning television color signal. (5) a third signal which receives an output signal from the scanning line interpolation circuit (5) and a progressively scanned television color signal from the down-conversion means (1), and selects and outputs one of the signals.
A television signal processing circuit, comprising: a selection circuit; 3. The television signal processing circuit according to claim 2, wherein said in-field luminance signal / chrominance signal separation means (6) performs in-field processing on an output signal of said first selection circuit (10). The in-field luminance signal / color signal separation circuit (14) for performing the separation into a luminance signal and a chrominance signal, and outputting the respective signals; the luminance signal output from the in-field luminance signal / color signal separation circuit (14); The output signal from the selection circuit (10) is input, and one of them is selected to select the luminance signal (Yf).
And a second selection circuit (15) for outputting as a signal. 4. The television signal processing circuit according to claim 1, wherein said down-conversion means (40) includes a first television luminance signal (525 / 30-AY) in accordance with a standard television signal scanning method. ) And a second television luminance signal (525) which is a television signal according to the scanning method of the standard television signal and has a relation in which the interlace structure is inverted for each field with respect to the first television luminance signal. / 30−
BY) and the first standard TV signal scanning method
Of the television color signal (525 / 30-AC) and the television signal according to the scanning method of the standard television signal, wherein the interlace structure is reversed for each field. And a second television color signal (525 / 30-BC). The EDTV processor (41) receives the standard television signal and the first television luminance signal. A first selection circuit (10) for selecting and outputting one of the standard television signals; a color demodulation circuit (45) for receiving the standard television signal, demodulating and outputting a color signal therefrom; A second selection circuit (46) that receives the output signal of (45) and the first television color signal and selects and outputs one of them; an output of the first selection circuit (10) Signal of the second selection circuit (46) A motion detection circuit (50) for inputting a force signal to detect and output a motion of an image; and an output signal of the first selection circuit (10) for processing between frames to separate a luminance signal. Inter-frame luminance signal separating means (11, 12) for outputting and outputting the output signal of the first selection circuit (10), and performs in-field processing to separate the luminance signal within the field. An output signal of the inter-frame luminance signal separating means (11, 12) and an output signal of the intra-field luminance signal separating means (47) in accordance with a motion detection signal from the motion detecting circuit (50). A motion-adaptive luminance signal separating circuit (42) including a first mixing circuit (53) for mixing the output signal and outputting a luminance signal; and a motion-adaptive luminance signal separating circuit (42). Interpolation processing by performing in-field processing on the luminance signal The first field in the interpolation scanning line generation circuit for creating (20)
And an output signal from the first intra-field interpolation scanning line creation circuit (20) and a second television luminance signal from the down-conversion means (40), and select and output one of them. A first selection circuit (21) and a first field for receiving the luminance signal output from the motion adaptive luminance signal separation circuit (42) and delaying it by one field period to form an inter-field interpolation scanning line. The output signal of the third selection circuit (21) and the first inter-field interpolation scanning line are generated in response to a motion detection signal from the inter-interpolation scanning line generating means (19) and the motion detection circuit (50). A second mixing circuit (22) for mixing and outputting the output signal of the means (19), an output signal of the first mixing circuit (53), and an output signal of the second mixing circuit (22). To create a progressive scan television luminance signal using A first double-speed conversion circuit (23) for generating and outputting a first motion-adaptive scanning line interpolation circuit (4), and an output signal from the second selection circuit (46). An inter-frame color signal separating means (54, 55) for separating color signals by performing inter-frame processing, and an output signal of the second selection circuit (46) are input, and perform color processing by performing in-field processing. An in-field color signal separation means (48) for separating signals; and an output signal from the inter-frame color signal separation means (54, 55) and the field signal in response to a motion detection signal from the motion detection circuit (50). Internal color signal separation means (48)
And a third mixing circuit (58) that mixes the output signal from the first and second output signals to output a color signal.
3) and a second intra-field interpolation scanning line creation circuit (60) which receives the color signal output from the motion adaptive color signal separation circuit (43) and performs an intra-field process to create an interpolation scanning line. ), The output signal from the second intra-field interpolation scanning line creation circuit (60) and the down-converting means (4
A fourth selection circuit (61) that receives the second television color signal from (0) and selects and outputs one of the second television color signal;
A second inter-field interpolation scanning line creating means (59) for creating an inter-field interpolation scanning line by receiving a color signal output from the motion adaptive luminance signal separation circuit (43) and delaying it by one field period; And the output signal of the fourth selection circuit 61 and the output signal of the second inter-field interpolation scanning line generating means (59) are mixed according to the motion detection circuit from the motion detection circuit (50). A fourth mixing circuit (62) that outputs the signals and outputs a progressive color television color signal using an output signal of the third mixing circuit (58) and an output signal of the fourth mixing circuit (62). And a second motion-adaptive scanning line interpolation circuit (44) including a second double-speed conversion circuit (63) for generating and outputting a television signal processing circuit. 5. The television signal processing circuit according to claim 4, wherein said in-field luminance signal separating means (47) is configured to:
And an intra-field luminance signal separation circuit (51) that receives an output signal of the selection circuit (10), performs an intra-field process, separates and outputs a luminance signal, and an intra-field luminance signal separation circuit (51). The first selection means (5) which receives the output luminance signal and the output signal of the first selection circuit (10), selects one of them, and outputs the selected signal as a luminance signal.
The in-field color signal separation means (48) receives the output signal of the second selection circuit (46), performs processing in the field, and separates and outputs a color signal. An in-field color signal separation circuit (56), a color signal output from the in-field color signal separation circuit (56), and the second selection circuit (4
A second selection circuit (57) that receives the output signal of (6), selects one of the output signals, and outputs the selected signal as a color signal.