JP4499201B2 - Digital encoder device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is suitable for use when, for example, a so-called NTSC system or PAL system video signal is formed from input information that is digitized and alternately provided with luminance information and first and second color difference information. The present invention relates to a digital encoder device. Specifically, for example, the first and second color difference information is processed without being separated, thereby simplifying the configuration of the apparatus.
[0002]
[Prior art]
For example, in a digital encoder apparatus that forms a so-called NTSC or PAL video signal from input information in which luminance information and first and second color difference information are alternately provided, for example, FIG. A device as shown in FIG.
[0003]
5, for example, digitized luminance information (Y ₀ , Y ₁ ...) And first and second color difference information (C _b0 , C _r0 , C _b2 , C _r2. And the input information as shown in FIG. 6A provided alternately. The input information supplied to the input terminal 51 is supplied to three data latch circuits 52, 53 and 54 provided in parallel.
[0004]
These latch circuits 52, 53, 54 are driven in turn at predetermined timings where, for example, the luminance information (Y) and the first and second color difference information (C _b , C _r ) are provided. Thus, for example, the luminance information (Y), the first color difference information (C _b ), and the second color difference information (C _r ) are separated as shown in B, C, and D of FIG. The separated luminance information (Y) is taken out to the output terminal 56 through a delay circuit 55 corresponding to processing of first and second color difference information described later.
[0005]
Further, the separated first color difference information (C _b ) and second color difference information (C _r ) are supplied to interpolation circuits 57 and 58 that supplement the information between them by, for example, the average value of the preceding and following information. Is done. As a result, the interpolation circuits 57 and 58, for example, interpolate the first color difference information (C _b0 , C _b1 , C _b2 , C _b3 ...) And the second color difference as shown by E and F in FIG. Information (C _r0 , C _r1 , C _r2 , C _r3 ...) Is formed.
[0006]
The first and second color difference information formed by these interpolation circuits 57 and 58 are supplied to low-pass filters 59 and 60, which will be described later, for filtering unnecessary information, for example. The first and second color difference information filtered by the low-pass filters 59 and 60 are supplied to the multiplication circuits 61 and 62, respectively, and are multiplied by the sine and cosine waveform information from the terminals 63 and 64, respectively. Thereby, orthogonal biaxial modulation of the first and second color difference information is performed.
[0007]
Further, the first and second color difference information subjected to orthogonal biaxial modulation by the multiplication circuits 61 and 62 are added by the adding circuit 65 and taken out to the output terminal 66. Thus, the input information supplied to the input terminal 51, for example, digitized and provided with the luminance information and the first and second color difference information alternately, is encoded into, for example, an NTSC video signal and output to the output terminal 66. It is taken out. For example, when encoding into a PAL video signal, the configuration can be substantially the same.
[0008]
[Problems to be solved by the invention]
However, in the above-described apparatus, for example, two systems of circuit configurations of interpolation circuits 57 and 58, low-pass filters 59 and 60, and multiplication circuits 61 and 62 for processing the first and second color difference information are provided. For this reason, there exists a possibility that the circuit scale of the whole apparatus may become very large.
[0009]
That is, FIG. 7 shows a specific configuration of one circuit in the low-pass filters 59 and 60 described above, for example. In FIG. 7, the color difference information supplied to the input terminal 71 is supplied to, for example, eight data latch circuits 72, 73, 74, 75, 76, 77, 78, 79 connected in series. Then, from these latch circuits 72 to 79, for example, as shown in the figure, information obtained by adding the output terminal information of the latch circuit 75 and the symmetrical position information by the adder circuits 80, 81, 82, 83 is extracted. .
[0010]
Further, the extracted information is supplied to arithmetic circuits 84, 85, 86, 87, and 88, respectively, and weighted according to predetermined coefficients. The weighted information is added by the adder circuit 89, so that a so-called FRI filter is formed and a desired filter characteristic is formed. As a result, for example, the filtered information of unnecessary information is extracted from the adder circuit 89 to the output terminal 90.
[0011]
However, in such a low-pass filter circuit, for example, the circuit configurations of the adder circuits 80, 81, 82, 83, and 89 are particularly complicated, and the circuit scale provided with a large number of such adder circuits increases. Furthermore, the circuit scale of the entire apparatus provided with two such low-pass filters becomes extremely large. Note that substantially the same circuit configuration is used for the interpolation circuit and the multiplication circuit, and the circuit scale of the entire apparatus described above in which these circuits are provided in two systems is further increased.
[0012]
This application has been made in view of the above points, and the problem to be solved is that the conventional apparatus is provided with two circuit configurations for processing the first and second color difference information. Therefore, there is a possibility that the circuit scale of the entire apparatus becomes extremely large.
[0013]
[Means for Solving the Problems]
For this reason, in the present invention, the first and second color difference information is processed using information processing means provided with two units of each unit delay means. The second color difference information can be processed in one system, and the circuit scale of the entire apparatus can be reduced.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
That is, in the present invention, the luminance information and the first and second color difference information are separated from the input information in which the digitized luminance information and the first and second color difference information are alternately provided. The separated first and second color difference information is supplied to information processing means provided with two unit delay means.
[0015]
Further, the processed first and second color difference information is supplied to the multiplication means, and predetermined sine and cosine waveform information is alternately supplied to the multiplication means for each unit delay time. Then, the first and second color difference information multiplied by the waveform information of the sine and cosine and the information obtained by delaying this information by the unit delay time are added and extracted.
[0016]
【Example】
Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an example of a digital encoder device to which the present invention is applied. In FIG. 1, for example, digitized luminance information (Y ₀ , Y ₁ ...) And first and second color difference information (C _b0 , C _r0 , C _b2 , C _r2. The input information as shown in FIG. 2A in which. The input information supplied to the input terminal 1 is supplied to two data latch circuits 2 and 3 provided in parallel.
[0017]
These latch circuits 2 and 3 are driven alternately at the timing at which the above-described luminance information (Y) and first and second color difference information (C _b , C _r ) are provided, for example. As shown in FIGS. 2B and 2C, the luminance information (Y) and the first and second color difference information (C _b , C _r ) are separated. The separated luminance information (Y) is taken out to the output terminal 5 through a delay circuit 4 corresponding to processing of first and second color difference information described later.
[0018]
Further, the separated first and second color difference information (C _b , C _r ) is supplied to an interpolation circuit 6 that supplements information between them by, for example, an average value of information before and after each other. As a result, the interpolation circuit 6 performs the first and second color difference information (C _b0 , C _r0 , C _b1 , C _r1 , C _b2 , C _r2 , C _b3 , C _b) interpolated as shown in FIG. _r3 ...) is formed. The first and second color difference information formed by the interpolation circuit 6 is supplied to, for example, a low-pass filter 7 described later for filtering unnecessary information.
[0019]
Further, the first and second color difference information filtered by the low-pass filter 7 is supplied to the multiplication circuit 8. Further, for example, sine and cosine waveform information is supplied to the terminals 9 and 10, respectively, and these waveform information is supplied to the selector circuit 11, for example, as shown in FIG. 2E, the first and second color difference information. They are alternately selected at every timing (unit delay time) provided (C _b , C _r ). The selected waveform information is supplied to the multiplication circuit 8 and is multiplied by the first and second color difference information.
[0020]
As a result, the multiplication circuit 8 performs orthogonal biaxial modulation of the first and second color difference information, and supplies the modulated first and second color difference information to the adder circuit 12. At the same time, the information modulated by the multiplication circuit 8 is supplied to the adder circuit 12 through the data latch circuit 13 which constitutes a delay means of one unit delay time. The information added by the adding circuit 12 is taken out to the output terminal 14.
[0021]
Accordingly, for example, the first and second color difference information in the digitized input information supplied to the input terminal 1 in which the luminance information and the first and second color difference information are alternately provided are orthogonal to each other. Biaxially modulated, encoded into an NTSC video signal, for example, and taken out to the output terminal 14. For example, when encoding into a PAL video signal, the configuration can be substantially the same.
[0022]
In this apparatus, the above-described interpolation circuit 6, low-pass filter 7 and multiplication circuit 8 are used in a time division manner. In this case, for example, in NTSC / PAL encoding, the coefficients of the interpolation circuit 6 are the same in the first and second color difference information systems, and the modulation of the first and second color difference information is, for example, the U axis, When performed on the V-axis, the coefficients of the low-pass filter 7 are the same.
[0023]
For example, the low-pass filter 7 is configured as shown in FIG. That is, in FIG. 3, the first and second color difference information (C _b , C _r ) is supplied to the input terminal 21. The color difference information supplied to the input terminal 21 includes, for example, eight sets (16 pieces) of data latch circuits 22, 23, 24, 25, one set formed by two circuits and the whole connected in series. 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37.
[0024]
Further, from among the latch circuits 22 to 37, for example, as shown in the figure, the information on the output end of the latch circuit 29 and the information on the symmetrical position for each of the above-described groups are added by the adder circuits 38, 39, 40, 41 The added information is extracted. The extracted information is supplied to arithmetic circuits 42, 43, 44, 45, and 46, respectively, and weighted according to predetermined coefficients. Further, the weighted information is added by the adding circuit 47 and taken out to the output terminal 48.
[0025]
That is, in the low-pass filter 7, the input terminal 21 has first and second color difference information (C _b0 , C _r0 , C _b1 , C _r1 , C _b2 , C _r2 , C _{b3) as shown in FIG.} , C _r3 ... For example, when the input information (C _b0 ) is latched by the latch circuit 29, for example, the processed first color difference information (C _bn ) is extracted from the output terminal 48. Thereafter, for example, as shown in FIG. 4B, the first and second color difference information (C _bn , C _rn , C _{bn + 1} , C _{rn + 1} , C _{bn + 2} , C _{rn + 2} , C _{bn +3} , C _{rn + 3} ...) _Are taken out in order.
[0026]
Here, for example, the first color difference information (C _bn ) taken out from the output terminal 48 is:
C _bn = a ₀ C _b0 + a ₁ (C _b1 + C _b-1 ) + a ₂ (C _b2 + C _b-2 )
+ A ₃ (C _b3 + C _b-3 ) + a ₄ (C _b4 + C _b-4 )
It is represented by For example, the second color difference information (C _rn ) is
C _rn = a ₀ C _r0 + a ₁ (C _r1 + C _r-1 ) + a ₂ (C _r2 + C _r-2 )
+ A ₃ (C _r3 + C _r-3 ) + a ₄ (C _r4 + C _r-4 )
It is represented by
[0027]
That is, in the above-described configuration, the first and second color difference information (C _bn , C _rn ) are alternately extracted to the output terminal 48 by forming the latch circuit serving as the information delay means by two circuits. . The coefficients (a ₀ , a ₁ , a ₂ , a ₃ , a ₄ ) are determined by the weights of the arithmetic circuits 42 to 46, respectively, so that a so-called FIR filter is formed and a filter circuit having a desired characteristic. Can be formed.
[0028]
Further, in the above-described configuration, the coefficients (a ₀ , a ₁ , a ₂ , a ₃ , a ₄ ) determined by the weights of the arithmetic circuits 42 to 46 are processed by the first and second color difference information processing as described above. It is a common thing. In the above-described apparatus, for example, the interpolation circuit 6 can also be realized with a substantially equivalent configuration. The coefficient in that case is also common in the processing of the first and second color difference information.
[0029]
Accordingly, in the above-described apparatus, the first and second color difference information is processed by using the information processing means provided with two units each of the unit delay means, thereby processing the first and second color difference information in one system. The circuit scale of the entire apparatus can be reduced.
[0030]
Further, in the above-described apparatus, good color difference information can be encoded by performing interpolation and / or filtering of the first and second color difference information as information processing means.
[0031]
Further, in the above-described apparatus, the processing of the first and second color difference information can be performed in one system by performing processing using a delay line provided with unit delay means of two units as information processing means. it can.
[0032]
That is, in the above-described apparatus, by using one system for processing, for example, in a multiplication circuit that processes each piece of information, the circuit can be halved. In addition, an interpolation circuit and a low-pass filter that use preceding and following information require two delay means, but the number of complicated addition circuits and the like can be halved.
[0033]
As a result, the conventional apparatus is provided with two circuit configurations for processing the first and second color difference information, and the circuit scale of the entire apparatus is extremely large. These problems can be easily solved.
[0034]
In the above-described apparatus, the separated luminance information is taken out through a delay unit corresponding to the processing of the first and second color difference information, thereby eliminating the time difference due to the processing of the first and second color difference information. be able to.
[0035]
Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
[0036]
【The invention's effect】
Therefore, according to the first aspect of the present invention, the first and second color difference information is processed by using the information processing means provided with two unit delay means for each unit, thereby obtaining the first and second color difference information. The processing can be performed by one system, and the circuit scale of the entire apparatus can be reduced.
[0037]
According to the second aspect of the present invention, satisfactory color difference information encoding can be performed by performing interpolation and / or filtering of the first and second color difference information as the information processing means.
[0038]
According to the invention of claim 3, the processing of the first and second color difference information is performed in one system by performing the processing using the delay line provided with the unit delay means for every two units as the information processing means. Is something that can be done.
[0039]
According to the invention of claim 4, the separated luminance information is taken out through a delay means corresponding to the processing of the first and second color difference information, so that the time difference due to the processing of the first and second color difference information is obtained. Can be eliminated.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an example of a digital encoder device to which the present invention is applied.
FIG. 2 is a diagram for explaining the operation;
FIG. 3 is a configuration diagram of a specific example of the main part.
FIG. 4 is a diagram for explaining the operation;
FIG. 5 is a configuration diagram of a conventional digital encoder device.
FIG. 6 is a diagram for explaining that;
FIG. 7 is a configuration diagram of the main part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Input terminal, 2, 3, 13 ... Data latch circuit, 4 ... Delay circuit, 5 ... Output terminal, 6 ... Interpolation circuit, 7 ... Low pass filter, 8 ... Multiplication circuit, 9, 10 ... Terminal, 11 ... Selector circuit , 12 ... Adder circuit, 14 ... Output terminal

Claims (2)

Separates the above luminance information and the first and second color difference information from the input information and the digitized luminance information and the first and second chrominance information is provided alternately,
The first and second chrominance information the separation, more information processing means unit delay means are provided by two units is interpolated and / or filtering process in a time-division without separation,
The first and second color difference information of the time-division processing subjected to the interpolation and / or filtering processing is supplied to the multiplication unit ,
For each unit delay time, predetermined sine and cosine waveform information is alternately selected and supplied to the multiplication means ,
First and second color difference information of the waveform information of the selected sine and cosine to the alternate is multiplied by two orthogonal axes modulated by Rukoto above Symbol time division processing is performed,
Digital encoder apparatus characterized by the modulated chrominance information is Eject are added and supplied to a unit delay time delay information in addition means. The digital encoder device according to claim 1, wherein
The separated luminance information is extracted through delay means corresponding to the processing of the first and second color difference information.

Images