JPH05176339A - Matrix circuit for television signals - Google Patents

Abstract

(57) [Abstract] [Purpose] When converting a television signal of the first format into a television signal of two formats different from the format of the first format, output of the converted signals of the two formats To provide a conversion circuit having a simple configuration with no delay between them. [Constitution] When converting an input signal into G, B and R primary color signals, the gates 5 and 5'are opened and the selection means 2 is opened.
The conversion coefficient a is selected by 2 ', 2 ", and the calculation means 3,
Matrix operations are performed with the input signals A1, A2 at 3 ', 3 ". The output of the operation means is the addition means 4, 4',
The luminance signal Y1 input to 4 "is added to G, B, R
The signal is obtained. When converting to signals Y2, C1 and C2, the gates 5 and 5'are closed, and the conversion coefficient b is selected by the selecting means 2, 2'and 2 ", and the calculating means 3 and 3 are used as described above. Input signals A1 and A at ', 3'
A matrix operation is performed with 2 to obtain signals Y2, C1 and C2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a matrix circuit for synthesizing a luminance signal and a color difference signal in a television receiver.

[0002]

2. Description of the Related Art A demodulated MUSE signal (luminance signal Y,
Color difference signals RY, BY) or NTSC signals are used as primary color signals (G, B, R) and high-definition luminance, color difference signals (Y,
PB, PR) or a primary color signal (G, B, R) and a luminance signal, and a color signal (Y, I, Q) are converted into those shown in FIG.
As shown in, the conversion was performed using two matrix circuits.

In FIG. 5, 201 and 202 are matrix circuits, respectively. When converting a MUSE signal, the matrix circuit 201 performs the conversion shown in the equation (1) and converts the MUSE signal into G, B and R primary color signals. Further, the matrix circuit 202 performs the conversion shown in the equation (2), and G, B, which are converted by the matrix circuit 201,
The R primary color signal was converted into Y, PB, and PR high-definition luminance and color difference signals.

[0004]

[Equation 1]

When converting an NTSC signal,
By the matrix circuit 201 and the matrix circuit 202, the conversion shown in the equations (4) and (5) is performed, and G, B,
It was converted into the R signal and the Y, I and Q signals.

[0006]

[Equation 2]

That is, the matrix circuits 201 and 20
In the case of the MUSE signal, 2 performs the conversion shown in the equation (3), and in the case of the NTSC signal, the equation (6) is applied to Y, PB, and PR.
Signal or Y, I, Q signals were obtained.

As described above, in a conventional television signal matrix circuit, for example, two types of signals of G, B, and R primary color signals and Y, PB, and PR high-definition luminance and color difference signals are output from the MUSE signal. When trying to get
Two matrix circuits are required, and the circuit configuration becomes complicated. Also, Y, PB, and PR high-definition brightness,
In order to obtain a color difference signal, two-step conversion by the matrix circuit 201 and the matrix circuit 202 is required,
Y, PB, and PR high-definition luminance, color difference signal is G,
There is a drawback that it is delayed compared to the B and R primary color signals.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the above-mentioned conventional circuit.
When converting a television signal of the above format into a television signal of two formats different from the above first format, the above conversion is possible with one circuit having a simple configuration, and one of the converted formats is also possible. It is an object of the present invention to provide a matrix circuit for a television signal in which the signal of 1 is not delayed from the signal of the other type.

[0010]

In order to achieve the above object, in the present invention, as shown in FIG. 1, conversion coefficient storage means 1 for storing a first conversion coefficient a and a second conversion coefficient b. 1 ', 1 "and selectively outputs the first conversion coefficient a or the second conversion coefficient b stored in the conversion coefficient storage means 1, 1', 1" according to the format of the television signal to be converted. Selecting means 2, 2 ′, 2 ″, and calculating means 3, 3 for multiplying the two types of input television signals A 1, A 2 by the conversion coefficient selected by the selecting means 2, 2 ′, 2 ″ to obtain the sum. ', 3'and the luminance signal Y1 are calculated by the calculating means 3, 3',
Gate means 5 for selecting whether to add to the output of 3 "
5'and addition means 4, 4 ', 4 "for adding the output of the luminance signal Y1 or the gate means 5, 5'to the outputs of the arithmetic means 3, 3', 3" are provided. Then, the television signal of the first format, which is composed of the luminance signal Y1 and the other two types of signals A1 and A2, is a television signal of two formats different from the first format that includes the primary color signals of G, B, and R. When converting into signals G, B, R and Y2, C1, C2, the selection means 2, 2 ', 2 "are switched by the control signal to selectively output the first conversion coefficient a or the second conversion coefficient b. At the same time, the open / close state of the gate means 5, 5'is switched.

[0011]

When converting the television signal of the first format consisting of the luminance signal Y1 and the other two kinds of signals A1 and A2 into the primary color signals of G, B and R, the selecting means 2 and 2 are selected by the control signal. The conversion coefficient storage means 1, by switching between ", 2"
The conversion coefficient a stored in 1 ', 1 "is selected and given to the arithmetic circuits 3, 3', 3", and the gate means 5,
Open 5 '. The arithmetic means 3, 3 ', 3 "are the signals A1, A2.
And the conversion coefficient a are used to perform a matrix operation, and the addition means 4, 4 ′ and 4 ″ add the outputs of the operation means 3, 3 ′ and 3 ″ and the luminance signal Y1 to obtain G, B and R signals. Further, in the case of converting into the television signals Y2, C1, C2 of other formats, the selecting means 2, 2 ',
2 "is switched to select the conversion coefficient b stored in the conversion coefficient storage means 1, 1 ', 1", and the arithmetic circuits 3, 3',
3 "and the gate means 5 and 5'are closed.
The calculating means 3, 3 ', 3 "are provided with the signals A1, A2 and the conversion coefficient b.
Then, the matrix calculation is carried out by the above, and the output of the calculating means 3 and the luminance signal Y1 are added by the adding means 4 to obtain the television signals Y2, C1, C2 of another format.

[0012]

FIG. 2 shows color difference signals R-Y and B- of MUSE signals.
When Y is input line-sequentially, the luminance signal Y and the color difference signal R
-Y, B-Y are the primary color signals of G, B, R and Y, PB,
High-definition luminance of PR, a circuit for converting into color difference signals
It is a figure which shows an Example. In the figure, 10, 11, 1
Numerals 2, 13, 14, and 15 are conversion coefficient storage means, respectively, for the luminance signal Y and the color difference signals RY and BY for Y and P.
B, PR high-definition luminance, color difference signals and G, B,
The coefficient for converting into the R primary color signal is stored. Two
0, 21, 22, 23, 24, 25 are selectors,
The Y, PB, and PR conversion coefficients and the G, B, and R conversion coefficients are selected and output according to the control signal. 30, 3
1, 32, 33, 34 and 35 are multiplying means, 41, 42,
Reference numeral 43 is an adding means, and 51 and 52 are AND gates.

Here, the luminance signal Y and the color difference signal R-
Coefficients for converting Y, B-Y into G, B, R primary color signals are represented by the above-described formula (1), and the luminance signal Y and the color difference signals RY, BY are Y, PB, PR. High definition brightness,
The coefficients to be converted into the color difference signals are the above-mentioned equations (1) and (2).
It is expressed by the equation (7).

[0014]

[Equation 3]

Next, the operation of the embodiment shown in FIG. 2 will be described. First, according to the control signal, the selectors 20, 21, 22, 2
3, 24 and 25 select coefficients for GBR conversion and output them to the multiplication means 30, 31, 32, 33, 34 and 35. Further, the AND gates 51 and 52 are opened according to the control signal.
The multiplying means 30, 32 and 34 add the color difference signal R-Y to the equation (1).
(In this example, -0.25 and 1.
25 and 0) and multiplying means 41, 42,
Output to 43. The multiplying means 31, 33 and 35 add the coefficients (in this example,
-0.5 and multiplying by 0 and 1) respectively, adder means 4
It outputs to 1, 42, 43.

As can be seen from the equation (1), G,
When converting to the B and R primary color signals, the coefficients of the luminance signal Y are all 1, so the luminance signal Y is not multiplied by the coefficient, and the AND gate 51 is opened directly and by the control signal. , 52 to add means 41, 4
2,43. The adding means 41, 42, 43 add the outputs of the multiplying means 30, 31, 32, 33, 34, 35 and the Y signal to perform the matrix operation shown in the equation (1), and G, B are applied to the outputs. , R primary color signals are generated.

The Y, RY and BY signals are converted into Y, PR and PB signals.
In the case of conversion into high-definition luminance and color difference signals, the selectors 20, 21, 22, 23, 24 and 25 select Y, PB and PR conversion coefficients according to the control signals and multiplying means 30, 31, and. It outputs to 32, 33, 34, and 35. Further, the AND gates 51 and 52 are closed according to the control signal. The multiplying means 30, 32, and 34 add the coefficient (0.088 in this example) shown in the equation (7) to the color difference signal RY.
7 and 0.7214 and 0.0563), respectively, and output to the addition means 41, 42 and 43. Multiplication means 3
1, 33 and 35 are the coefficients (-0.1452 and 0.078 in this example) shown in the equation (7) in the color difference signal BY.
2 and 0.0721) and multiplying means 4 respectively
It outputs to 1, 42, 43.

Here, the first column of the equation (7), which is the calculation result of the above equation (3), is (1, 0, 0), and the conversion coefficient of the luminance signal Y is 1 or 0. , RY, B
When converting the Y signal into Y, PB, and PR high-definition luminance and color difference signals, it is not necessary to multiply the luminance signal Y by a coefficient other than 1. Therefore, the Y signal is directly applied to the adding means 41 without being multiplied by the coefficient, the AND gates 51 and 52 are closed, and the Y signal is added to the adding means 42 and 4.
Not given to 3. The adders 41, 42, 43 add the outputs of the multipliers 30, 31, 32, 33, 34, 35 and the Y signal to perform the matrix calculation shown in the equation (7), and output Y, PB. , PR Hi-Vision luminance and color difference signals are generated.

FIG. 3 shows the luminance signal Y and the color difference signals RY and BY when the color difference signals RY and BY are input in dot sequence.
Is a diagram showing a second embodiment for converting G into primary color signals of G, B and R and high-definition luminance and color difference signals of Y, PB and PR.

In the figure, reference numerals 110, 111 and 112 denote conversion coefficient storage means, respectively, similar to those of the first embodiment, which are luminance signal Y, color difference signals RY and BY, and Y, respectively.
PB, PR high-definition luminance, color difference signal and G,
The coefficients for converting the B and R primary color signals are stored. Reference numerals 121, 122 and 123 denote selectors, which are Y, PB and PR according to the control signal, as in the first embodiment.
A coefficient for conversion and a coefficient for G, B, R conversion are selected and output. 130, 131, 132 are multiplication means, 14
1, 142 and 143 are addition means, and 151 and 152 are AND gates. Reference numerals 161, 162 and 163 denote adders, which calculate and output the sum of the signals obtained by multiplying the color difference signals R-Y and B-Y, which are sequentially input in dot sequence, by a coefficient.

FIG. 4 shows an embodiment of the configuration of the adders 161, 162, 163 and a time chart during its operation. In the figure a, 171 is a delay means and 172 is an adder means. When the signal RY is input, as shown in the figure b, the delay means 171 delays the signal RY by a unit time and the next signal BY is input. At this time, the signal RY which is the output of the delay means and the next signal BY are added by the adding means 172, and the sum of the signal RY and the signal BY is output.
When the next signal RY is input, the signals BY and RY delayed by a unit time are added to output the sum of the signals BY and RY, and in the same manner, the outputs shown in FIG.

Next, the operation of the second embodiment shown in FIG. 3 will be described. First, according to the control signal, the selectors 121, 12
2, 123 selects a coefficient for GBR conversion and multiplies by 1
It is output to 30, 131, and 132. Further, the AND gates 151 and 152 are opened according to the control signal.

The multiplying means 130, 131 and 132 calculate the color difference signal R-Y among the color difference signals sequentially input by the equation (1).
(In this example, -0.25 and 1.
25 and 0) respectively and adders 161, 16
2, 163. Next, when the color difference signal B-Y is input, the multiplying means 130, 131 and 132 cause the color difference signal B-Y.
The coefficient shown in equation (1) for Y (in this example, −
0.5 and 0 and 1) respectively to adder 161,
It outputs to 162,163.

The adders 161, 162, 163 obtain addition values of the signal obtained by multiplying the color difference signal RY by the coefficient and the signal obtained by multiplying the color difference signal BY by the coefficient, and adder means 141, 142, 1
Output to 43. On the other hand, the luminance signal Y is added directly to the addition means 14 via the AND gates 151 and 152 in the open state.
1, 142, 143, and adding means 14
1, 142 and 143 are luminance signals Y and adders 161, 16
2, 163 outputs (the sum of the signal obtained by multiplying the color difference signal RY by the coefficient and the signal obtained by multiplying the color difference signal BY by the coefficient) are obtained, and G, B, and R signals are output.

The Y, RY and BY signals are converted into Y, PR and PB signals.
In the case of converting into the high-definition luminance and color difference signals of, the selectors 121, 122, and 123 select Y,
Multiplying means 130, 1 by selecting coefficients for PB and PR conversion
It outputs to 31,132. Further, the AND gates 151 and 152 are closed according to the control signal. Multiplication means 130, 1
31 and 132 are the coefficients (0.0887, 0.7214 and 0.0563 in this example) shown in the equation (7) in the color difference signal R-Y of the color difference signals sequentially input.
And output to adders 161, 162, 163. Next, when the color difference signal BY is input, the multiplying means 130, 131 and 132 add the coefficients (-0.1452 and 0.0782 in this example) shown in the equation (7) to the color difference signal BY. And 0.0721) and output to the adders 161, 162, 163.

As described above, the adders 161, 162, 163 obtain the added value of the signal obtained by multiplying the color difference signal RY by the coefficient and the signal obtained by multiplying the color difference signal BY by the coefficient, and the adding means 1
It outputs to 41, 142, 143. On the other hand, since the AND gates 151 and 152 are closed as described above, the luminance signal Y is not input to the adding means 142 and 143 but is given only to the adding means 141.

The adding means 141 is a brightness signal Y and an adder 16
1 (color difference signal R-Y multiplied by a coefficient and color difference signal B-
The sum Y of the signals multiplied by the coefficient) is added to obtain the output Y, and the addition means 142 and 143 do not add the luminance signal Y because the AND gates 151 and 152 are closed, and the adder is added. 162, 163 output signals (color difference signal RY
And a color difference signal BY with a coefficient) PB, PR are output.

In the above embodiment, the luminance signal Y and the color difference signals RY and BY of the MUSE signal are converted into the primary color signals of G, B and R and the high definition luminance and color difference signals of Y, PB and PR. Although an example is shown, the present invention is not limited to the above-mentioned embodiment, and as shown in Table 1, Y, PB,
PR high-definition luminance, color difference signals Y, RY, B-
It can also be applied when converting to Y signals and G, B, R signals, or also when converting NTSC signals.

[0029]

[Table 1]

The conversion coefficients for converting the high-definition luminance of Y, PB and PR and the color difference signals into the luminance and color difference signals of the Y, RY and BY signals are represented by the equation (8), and Luminance of NTSC signals, color difference signals Y, BY, RY
G, B, R primary color signals or luminance, color signals Y, I,
Conversion coefficients when converting to Q are expressed by equations (9) and (10), respectively.

[0031]

[Equation 4]

[0032]

As is apparent from the above description, according to the present invention, a television signal of the first format can be converted into signals of two formats different from the first format by one circuit having a simple structure. It can be converted into a television signal,
Since it is possible to obtain two types of television signals by one conversion, it is possible to obtain the effect that the converted one type signal is not delayed from the other type signal.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a first embodiment of the present invention.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of an adder according to the present invention and a time chart thereof.

FIG. 5 is a diagram showing a conventional example.

[Explanation of symbols]

1, 1 ', 1 "conversion coefficient storage means 2, 2', 2" selection means 3, 3 ', 3 "computing means 5, 5'gate means 4, 4', 4" addition means 10, 11, 12, 13, 14, 15 Transform coefficient storage means 20, 21, 22, 23, 24, 25 Selector 30, 31, 32, 33, 34, 35 Multiplier means 40, 41, 42 Adder means 51, 52 AND gate 110, 111, 112 conversion coefficient storage means 121, 122, 123 selectors 130, 131, 132 multiplication means 141, 142, 143 addition means 151, 152 AND gates 161, 162, 163 adder 171 delay means 172 addition means

Claims (3)

[Claims] 1. A luminance signal (Y1) and two other types of signals (A1, A2)
A television signal of the first format consisting of two types of television signals (G, B, R) different from the first format including G, B, R primary color signals (G, B, R). , (Y2, C1, C2) in the matrix circuit of the television signal to be converted into the storage means (1, 1 ', 1 ") for storing the first conversion coefficient a and the second conversion coefficient b. Depending on the format of the television signal, the storage means (1,
Selection means (2,2 ', 2 ") for selectively outputting the first conversion coefficient a or the second conversion coefficient b stored in 1', 1") and the two types of signals (A1, A2) A calculation means for multiplying the conversion coefficient selected by the selection means (2,2 ', 2 ") to obtain the sum
(3,3 ', 3 "), a gating means (5,5') for selecting whether to add the luminance signal (Y1) to the output of the computing means (3,3 ', 3"), and a luminance It consists of adding means (4,4 ', 4 ") that adds the output of the signal (Y1) or the gate means (5,5') to the output of the computing means (3,3 ', 3") and is selected by the control signal. The means (2,2 ', 2 ") is switched to selectively output the first conversion coefficient a or the second conversion coefficient b, and the open / close state of the gate means (5,5') is switched to change the first The two types of television signals (G, B, R), (Y2, Y2, A1, A2) different from the first type
Matrix circuit for television signals, characterized by converting to C1, C2). 2. A television signal matrix circuit according to claim 1, wherein two kinds of signals (A1, A2) other than the luminance signal (Y1) among the input signals are input line-sequentially. 3. The television signal matrix circuit according to claim 1, wherein two kinds of signals (A1, A2) other than the luminance signal (Y1) among the input signals are input in a dot-sequential manner.