JP2595571B2 - Television signal processor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television signal processing apparatus, and more particularly, to a so-called picture-in-picture signal for displaying a plurality of television signals having different numbers of scanning lines on the same screen. It relates to the processing device.

2. Description of the Related Art In a television signal processing device that simultaneously displays one of a plurality of television signals as a main screen and the other as a sub-screen on the same screen, when the number of scanning lines and the scanning method are different, one of the other is used as the other. Are usually used.

For example, a high-definition (high-definition television) signal with 1125 scanning lines and an aspect ratio of 16: 9,2: 1 interlaced scanning and 52 scanning lines
When 5 lines and 4: 3, 2: 1 interlaced scanning standard TV signals are displayed on the same screen, scan conversion processing is performed to match the standard TV signals with the processing speed of Hi-Vision signals. Is generally used. For example, as shown in FIG. 3, a standard television signal from the first signal input terminal 1 is written into the memory 2 at a predetermined signal processing speed, and is synchronized with a high definition signal supplied to the second signal input terminal 3. Scan conversion or scanning synchronization is performed by reading from the memory 2, and these Hi-Vision signals and a standard television signal subjected to predetermined signal processing are time-division multiplexed by a multiplexing circuit 4 and transmitted to a signal output terminal 5. It is. The multiplexing circuit 4 performs pixel thinning and time axis compression processing on the sub-screen signal and then time-division multiplexes with the main-screen signal or directly time-division multiplexes two input signals. And performs signal processing.

However, in the above-described conventional device, the display device having the aspect ratio of 16: 9 simultaneously displays the Hi-Vision signal and the standard television signal processed in synchronization with this signal. If the HDTV signal is displayed on the main screen,
Since it is assumed that the standard television signal is displayed on the sub-screen, the reverse mode, that is, the so-called screen exchange in which the standard television signal is displayed on the main screen and the HDTV signal is displayed on the sub-screen, cannot be easily performed. Has practical problems.

Means for Solving the Problems The present invention relates to a standard television signal of the number of scanning lines N, 2: 1 interlaced scanning, the number of scanning lines is N or N, and the number of scanning lines is 2N. A first scan conversion circuit for converting into an interlaced scanning signal; a scanning line number M; a 2: 1 interlaced scanning Hi-Vision signal, which is sequentially scanned with N scanning lines or 2N scanning lines; 1: a second scanning conversion circuit for converting to interlaced scanning signals, and a multiplexing circuit for performing signal processing using one of the output signals of the first and second scanning conversion circuits for the main screen and the other for the sub-screen Is a television signal processing device.

According to the present invention, the first and second scan conversion circuits arranged according to the above-described configuration allow the output signals of both to have a scan line number of 525.
The signal is converted into a signal of the progressive scanning type or 1050 2: 1 interlaced scanning type. The first scan conversion circuit effectively converts a standard format television signal having an aspect ratio of 4: 3, which is an input signal, into twice the number of scanning lines by performing a scan conversion process using an intra-field, an inter-field, or the like. The second scan conversion circuit converts a high-vision signal having an aspect ratio of 16: 9, which is an input signal, into a signal of progressive scanning or 2: 1 interlaced scanning, and converts 525 signals per field from 1125 scanning lines. Select 5
The signal is transmitted as a 25-line sequential scanning type or a 1050-line 2: 1 interlaced scanning type signal. The multiplexing circuit uses one of the standard television signal and the high-vision signal converted into the same number of scanning lines supplied from the first scanning conversion circuit and the second scanning conversion circuit for the main screen, and time compression and pixel thinning for the other. And so on, for the sub-screen, and time-division multiplexes them.

Embodiments Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a television signal processing apparatus according to an embodiment of the present invention, in which both a standard television signal and a high-definition television signal are converted into a progressive scanning system having 525 scanning lines, and these are converted to a main screen. 2 shows a configuration in which images are combined for a sub-screen and a sub-screen.

In the figure, the number of scanning lines supplied to the first signal input terminal 10
525 lines, 2: 1 interlaced scanning standard television signals are supplied to a time axis compression circuit 101 and a memory 102, respectively. The time axis compression circuit 101 is transmitted every field in a 2: 1 interlaced scanning system.262.
In order to supply the video signals corresponding to the five scanning lines to one input terminal of the switch 103 as sample scanning line signals of a sequential scanning type, the time axis is compressed to approximately 1/2. Memory 102 is 1
A field, that is, a delay of 262 scanning lines is given to a standard television signal and supplied to one input terminal of the switch 106 as a first inter-product scanning line signal. The delay memory 104 and the adder circuit 105 for one horizontal scanning period supply the second interpolation scanning line signal to the conductor 1
The first and second interpolated scanning line signals are supplied to the other input terminal of the switch 106 through the switch 07, and the switch 106 is configured to be switched for each scanning line or each pixel. The first and second inter-step scanning line signals are based on the presence / absence of motion of the image, and the like.
In the still image portion, the second interpolation scanning line signal is
A switch 103 for switching the horizontal axis at a double scanning processing speed after compressing the time axis to approximately 1/2 by the time axis compressing circuit 109 via the conducting wire 108 by controlling so that 6 is selected. Is supplied to the other input terminal. The first scan conversion circuit 100 including these circuits sends out a standard television signal converted into 525 progressive scan signals to an output terminal 11 of the first scan conversion circuit 100. The above-described interpolation scan line signal generation circuit is a memory. Instead of using the switch 102, the switch 106 may be configured to always select a signal supplied through the conductor 107.

The second scan conversion circuit 200 selects a field scan line 525 from the HDTV signal supplied to the second signal input terminal 20.
A memory 201 for transmitting the main signal to the conductor 202 in synchronization with the signal transmitted from the first scan conversion circuit 100 to the terminal 11 is provided. It is possible to appropriately select which of the aspect ratios 4: 3 and 16: 9 the memory 201 sends to a standard television signal and an HDTV signal having a different image aspect ratio. For example, when displaying a television signal processed by the signal processing device of the present invention and transmitted to the signal output terminal 32 on a display device having an aspect ratio of 16: 9, the memory 201 has 1050 scanning lines and an aspect ratio of 16: 9.
It is desirable to transmit a 2: 1 interlaced scanning signal to the conductor 202 at 9. On the other hand, when the display coupled to the signal output terminal 32 has an aspect ratio of 4: 3, the memory 201 transmits a signal of 1050 scanning lines and a 2: 1 interlaced scanning signal with an aspect ratio of 4: 3 to the conductor 202. Although it is desirable to transmit the signal, the present invention does not limit the aspect ratio of a signal output from the memory 201 to the conductor 202 after converting the number of scanning lines.

The switch 203 to which the high definition signal converted from the memory 201 to one input terminal via the lead 202 is supplied as a sample scanning line signal is connected to the other input terminal by one horizontal scanning period memory 204 and interpolation processed by the addition circuit 205. A scanning line signal is supplied, and these two input signals are switched every field, that is, approximately every 1/60 second, and a high-vision signal converted into a sequential scanning system having 525 scanning lines is transmitted to the terminal 21.

A multiplexing circuit 300 in which a high-definition signal and a standard television signal, which are sequentially converted into a scanning format, are supplied to two input terminals 30 and 31, respectively, receives these two signals as inputs,
A switch 305 for supplying one to the main screen input terminal of the signal selection circuit 302 via the conductor 301 and the other to the sub-screen input terminal of the signal selection circuit 302 via the conductor 303 and the sub-screen processing circuit 304. The main screen and the sub-screen are configured to be interchangeable. The signal selection circuit 302 time-division multiplexes the signal for the main screen described above, and transmits a combined television signal of a high-definition signal and a standard television signal to the signal output terminal 32 in a sequential scanning manner of 525 scanning lines and approximately 60 frames. I do.

FIG. 2 shows another embodiment of the present invention.
The second scan conversion circuit is configured to output a signal of a scanning line number of 1050 lines and a 2: 1 interlaced scanning system.

In the figure, a first scan conversion circuit 1000 includes a time axis compression circuit 101 for a sample scanning line to a time axis compression circuit 1 for an interpolation scanning line.
09, a progressive scan conversion process for a standard television signal, and a signal that the switch 103 sends out to the lead 1001 is supplied to one input terminal, and one horizontal scan line period memory 1002, an adder circuit 1003, and a lead 1004 are supplied to the other input terminal. Through switch 10
The switch 1005 supplied with the output signal of 3 is a standard television which converts these two input signals to the switching terminal 110 into 1050 scanning lines and 2: 1 interlaced scanning every field, that is, approximately every 1/60 second. Send a signal. Second scan conversion circuit 20
In the same manner as in FIG. 1, the high-definition signal 00 is converted into a signal having a scanning line number of 1050 lines and a 2: 1 interlaced scanning method by the memory 201 and transmitted to the terminal 210. A Hi-Vision signal and a standard television signal are supplied to the two input terminals 300 and 310 respectively.
The multiplexing circuit 300 supplied from the scan conversion circuits 2000 and 1000 also performs the same processing as in FIG. 1, time-division multiplexes one for the main screen and the other for the sub-screen, and sends these to the signal output terminal 320. It is transmitted as a synthesized television signal.

The television signal processing apparatus according to the present invention converts the standard television signal and the Hi-Vision signal having different numbers of scanning lines into a double-scanning processing signal of the standard television signal as described above, and then uses one for the main screen, The other is processed and combined for the sub-screen. Therefore, the image of the main screen can be easily replaced, and the practical value is large.

[Brief description of the drawings]

FIG. 1 is a block diagram of a television signal processing apparatus according to one embodiment of the present invention, FIG. 2 is a block diagram of a television signal processing apparatus according to another embodiment of the present invention, and FIG. It is a block diagram of a processing device. 10, 20 ... signal input terminal, 100 ... first scan conversion circuit, 20
0: second scan conversion circuit, 300: multiplex circuit, 32: signal output terminal.

Claims (1)

(57) [Claims] 1. A television signal processing apparatus for time-division multiplexing first and second television signals having different numbers of scanning lines and displaying the signals on the same screen, the apparatus comprising:
A first scanning conversion circuit for processing a 2: 1 interlaced scanning first television signal, and a second scanning signal for M lines (M> 2N) and 2: 1 interlaced scanning. A second scan conversion circuit, and a multiplexing circuit for time-division multiplexing one of the output signals of the first and second scan conversion circuits for the main screen and the other for the sub-screen. The scan conversion circuit is either a progressive scan type with N scanning lines or a 2N scanning line type.
A television signal processing device, which transmits a 2: 1 interlaced scanning signal to a multiplexing circuit.