JPH11146414A - Signal processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display computer image on the screen of a television receiver with excellent image quality. SOLUTION: By using the three primary color signals SAR, SAG and SAB of the computer image supplied from a computer system, horizontal synchronizing signals HASYNC and vertical synchronizing signals VASYNC, the brightness signals DBY and color-difference signals DB(R-Y) and DB(B-Y) of television scanning are generated in a signal conversion part 13. Coefficients set in coefficient generation parts 32a-32c are multiplied with the signals DBY, DB(R-Y) and DB(B-Y) by multipliers 31a-31c, obtained results are arithmetically processed in an adder-substractor 33 and the three primary color signals SPR, SPG and SPB are generated. In an encoder part 18, the luminance signals SBY and chrominance signals SBC of Y/C separation and composite video signals SBCOMP are generated. Further, in a synchronizing separation part 35, composite synchronizing signals SBSYNC are generated. By using the three primary color signals SPR, SPG and SPB, the need of encoding and decoding processings is eliminated and the computer image is displayed with the excellent image quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a signal processing device. More specifically, the signal conversion means processes a signal of a method different from the television scanning to obtain a signal of the television scanning method, and a luminance signal and a chrominance signal Y / C separated from the signal by the encoding means, or One or both of the composite video signals are obtained, and three primary color signals are generated by three primary color signal generation means.

[0002]

2. Description of the Related Art Conventionally, in order to display an image of a system different from that of television scanning, for example, a computer image generated by a computer device on a screen of a television device, three primary color signals and a synchronization signal of the computer image are used. A signal processing device that generates a television scanning signal is used.

[0003] This signal processing device comprises, for example, A / D converters 11R, 11G and 11B, a signal converter 13, D / A converters 15a, 15b and 15c, and an encoder 17 as shown in FIG. I have.

In FIG. 4, for example, analog three primary color signals SAR, SAG, SA supplied from a computer device.
B denotes A / D converters 11R and 11 of the signal processing device 10.
G and 11B are digital three primary color data signals DA
The signal is converted into R, DAG, and DAB and supplied to the signal conversion unit 13.

[0005] The signal conversion unit 13 is configured using a memory, and the supplied three primary color data signals DAR, DAG, D
AB is written to memory. The reading of the data signal written in the memory is controlled, and a matrix process is performed using the read data signal, so that the television system luminance data signal DBY and the color difference data signal D
B (RY) and DB (BY) are generated. Also, the signal conversion unit 1
3, a horizontal synchronizing signal HASYNC and a vertical synchronizing signal VASYNC are supplied from a computer device, and a timing signal synchronized with the horizontal synchronizing signal HSYNC and the vertical synchronizing signal VSYNC is generated. Writing and reading of the three primary color data signals are performed. Further, the signal conversion unit 13 generates the generated luminance data signal DBY and the color difference data signal DB of the television system.
(RY), a composite synchronization signal for DB (BY) is generated,
It is added to the luminance data signal DBY.

The luminance data signal DBY and the color difference data signals DB (RY) and DB (BY) generated by the signal
The signals are converted into analog luminance signals SBY and color difference signals SB (RY) and SB (BY) by the / A converters 15a, 15b and 15c and supplied to the encoder unit 17.

In the encoder 17, the color difference signal SB (R-
A color signal SBC is generated from Y) and SB (BY), and a luminance signal SBY and a color signal SBC are output as Y / C separated signals. Further, a composite video signal SBCOMP generated by adding the luminance signal SBY and the color signal SBC is also output. The luminance signal SBY and the color signal S output from the encoder 17
The BC or the composite video signal SBCOMP is supplied to the television device, and a computer image is displayed on the screen of the television device.

[0008]

In a television device, the supplied luminance signal SBY and chrominance signal SBC or composite video signal SBCOMP are processed by a decoder to generate three primary color signals, and an image is received based on the three primary color signals. The tube is driven. Therefore, the signal processing device or the television device repeats the encoding process and the decoding process, so that the signal is degraded, so that it is impossible to display an image of a method different from the television scanning with good image quality.

Therefore, in the present invention, the number of times of signal conversion is reduced, and an image of a system different from television scanning is displayed with good image quality on the screen of a television device.

[0010]

A signal processing device according to the present invention is obtained by a signal conversion means for processing a signal of a method different from television scanning to obtain a signal of a television scanning method, and a signal conversion means. Encoding means for outputting one or both of a Y / C-separated luminance signal and color signal or a composite video signal from the obtained signal, and three primary color signal generation means for generating three primary color signals from the signal obtained by the signal conversion means. It has.

In the present invention, a luminance signal and a color difference signal for television scanning are generated by signal conversion means from three primary color signals of a non-interlaced system or the like different from television scanning. The encoding means generates one or both of a Y / C separated luminance signal and color signal, or a composite video signal from the luminance signal and the color difference signal.
The three primary color signal generating means generates a three primary color signal from the luminance signal and the color difference signal.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a signal processing device according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the overall configuration of a system for displaying an image of a system different from television scanning on a screen of a television device using the signal processing device according to the present invention.

In FIG. 1, three primary color signals SAR, SAG, and SAB, which are non-interlaced, for example, different from television scanning, a horizontal synchronizing signal HASYNC, and a vertical synchronizing signal VASYNC, which are different from television scanning, are supplied to a signal processing device 30. Is done.

The signal processing device 30 has the configuration shown in FIG. In FIG. 2, parts corresponding to those in FIG. 4 are denoted by the same reference numerals.

In FIG. 2, the three primary color signals SAR, SAG, S
AB is converted into three primary color data signals DAR, DAG, and DAB by A / D converters 11R, 11G, and 11B, and supplied to the signal conversion unit 13.

The three primary color data signals DAR, DAG and DAB supplied to the signal conversion unit 13 are written in a memory. The reading of the data signal written in the memory is controlled, and a matrix process is performed using the read data signal to execute a television-type luminance data signal DB.
Y and color difference data signals DB (RY) and DB (BY) are generated. Further, a timing signal synchronized with the horizontal synchronization signal HASYNC and the vertical synchronization signal VASYNC supplied from the computer device 20 is generated, and the writing and reading of the three primary color data signals with respect to the memory are performed based on the timing signal. Further, a composite synchronizing signal for the television system luminance data signal DBY and the color difference data signals DB (RY) and DB (BY) is generated and added to the luminance data signal DBY.

The luminance data signal DBY and the color difference data signals DB (RY) and DB (BY) generated by the signal
/ A converters 15a, 15b, 15c and multipliers 31a, 31b, 31c.

The multiplier 31a multiplies the luminance data signal DBY supplied from the signal converter 13 by the coefficient supplied from the coefficient generator 32a, and supplies the obtained multiplication result to the adder / subtracter 33. In the multiplier 31b, the color difference data signal DB (RY) supplied from the signal conversion unit 13 is multiplied by the coefficient supplied from the coefficient generation unit 32b, and the obtained multiplication result is supplied to the addition / subtraction unit 33. Similarly, in the multiplier 31c, the color difference data signal DB (BY) supplied from the signal conversion unit 13 is multiplied by the coefficient supplied from the coefficient generation unit 32c, and the obtained multiplication result is supplied to the addition / subtraction unit 33. You.

In the adder / subtractor 33, multipliers 31a, 31b,
The three primary color data signals DPR, DPG, and DPB are generated based on the multiplication result supplied from 31c. The three primary color data signals DPR, DPG, DPB are supplied to D / A converters 34R, 34R.
4G, 34B analog three primary color signals SPR, SPG, SP
The signal B is supplied to the signal selector 43 of the television device 40 as shown in FIG.

The D / A converters 15a, 15b, 15
c, the luminance signal SBY and the color difference signals SB (RY), SB (B
-Y) and supplied to the encoder unit 18.

In the encoder section 18, the color difference signal SB (R-
A color signal SBC is generated from Y) and SB (BY), and the luminance signal SBY and the color signal SBC are Y / C separated signals. Further, the composite video signal SBCOMP is generated by adding the luminance signal SBY and the color signal SBC. The luminance signal SBY and the color signal SBC generated in this manner, or the composite video signal SB
COMP is supplied to the decoder unit 51 of the television device 50 as shown in FIG.

Note that the luminance data signal DBY and the color difference data signals DB (RY) and DB (BY) generated by the signal
Are analog luminance signal SBY and color difference signals SB (RY), SB (BY) by D / A converters 15a, 15b, 15c.
And supplied to the encoder 18.

In the encoder section 18, the color difference signal SB (R-
A color signal SBC is generated from Y) and SB (BY), and a luminance signal SBY and a color signal SBC are output as Y / C separated signals. Further, a composite video signal SBCOMP generated by adding the luminance signal SBY and the color signal SBC is also output. The encoder 18 outputs not only the luminance signal SBY, the color signal SBC, and the composite video image signal SBCOMP, but also outputs only the luminance signal SBY and the color signal SBC, or outputs only the composite video image signal SBCOMP. It may be.
The luminance signal SBY and the chrominance signal SBC or the composite video signal SBCOMP output from the encoder section 18 are supplied to the decoder section 41 of the television device 40 as shown in FIG.

Further, the composite video signal SBCOMP generated by the encoder section 18 is supplied to the synchronization separation section 35, where the composite synchronization signal SYCOMP is separated from the composite video signal SCOMP. The composite synchronizing signal SYCOMP is supplied to the synchronizing signal processing section 44 of the television device 40 as shown in FIG.

Here, the coefficient generators 32a, 32b, 32
In c, the coefficient is determined as follows. First, the luminance signal EY and the color difference signals E (RY) and E (BY) are
R (International Radiocommunication Advisory Committee) standard 601 shows the equations (1) to (3). Y = 0.299R + 0.587G + 0.114B (1) Cr = (RY) = 0.500R-0.419G-0.081B (2) Cb = (BY) =-0.169R-0.331G + 0 .500B (3) Equations (4) to (6) for obtaining the three primary color signals R, G, and B can be obtained from Equations (1) to (3). R = Y + 1.371Cr (4) G = Y−0.698Cr−0.336Cb (5) B = Y + 1.732Cb (6)

For this reason, the coefficients are set so that the three primary color signals can be obtained by performing the addition and subtraction represented by the equations (4) to (6) in the adder / subtractor 33. That is, the coefficient “1” is set in the coefficient generator 32a. In the coefficient generator 32b, a coefficient “1.371” and a coefficient “−0.698” are set. Further, the coefficient generation unit 32c sets a coefficient “−0.336” and a coefficient “1.732”.

The adder / subtractor 33 is supplied with the luminance data signal “DBY” from the multiplier 31a, and
b to the color difference data signal "1.371DB (RY)""-0.698DB
(RY) "is supplied. Further, the color difference data signals “−0.336DB (BY)” and “1.732DB (BY)” are supplied from the multiplier 31c. In the adder / subtractor 43, the multipliers 31a, 31b,
The three primary color data signals DP are calculated by performing the operations of Expressions (4) to (6) using the data signal supplied from
R, DPG, and DPB can be generated.

A receiving section 42 having a tuner is connected to the decoder section 41 of the television apparatus 40. The video signal STV supplied from the receiving section 42 and the signal processing apparatus 30
Based on the luminance signal SBY and the chrominance signal SBC or the composite video signal SBCOMP supplied from the
TG and STB are generated. These three primary color signals STR, ST
G and STB are supplied to the signal selection unit 43.

Here, when displaying the received image of the television broadcast, the decoder 41 uses the video signal STV supplied from the receiver 42 to output the three primary color signals STR, STG,
While the STB is generated, the signal selection unit 43 selects the three primary color signals STR, STG, and STB and supplies them to the picture tube driving unit 45. In the synchronization signal processing unit 44, the synchronization signal is separated from the video signal STV supplied from the reception unit 42, and the horizontal synchronization signal HTSYNC is supplied to the picture tube driving unit 45. For this reason, in the picture tube driving section 45,
The three primary color signals STR, STG, STB and the horizontal synchronizing signal HTSYN
The three primary color drive signals DR, DG, and DB are generated based on C, and the picture tube 46 is driven by the three primary color drive signals DR, DG, and DB to display a television image on a screen.

When displaying a computer image, the signal selection unit 43 selects the three primary color signals SPR, SPG, and SPB and supplies them to the picture tube driving unit 45. In the synchronization signal processing unit 44, the horizontal synchronization signal HPSY extracted from the composite synchronization signal SBSYNC supplied from the signal processing device 30 is output.
The NC is supplied to the picture tube driving unit 45. For this reason, the picture tube driving section 45 outputs the three primary color driving signals DR, D based on the three primary color signals SPR, SPG, SPB and the horizontal synchronization signal HPSYNC.
G and DB are generated, and the three primary color driving signals DR and D are generated.
The picture tube 46 is driven by G and DB, and a computer image is displayed on the screen.

As described above, when a computer image is displayed on the screen of the television device 40, the encoding process in the signal processing device 30 and the decoding process in the television device 40 become unnecessary, and the number of signal conversion processes is reduced. Since the number can be reduced, computer images can be displayed on the screen of the television device with good image quality.

Incidentally, in the above-described embodiment, the three primary color signals S (Y) and the color difference data signals DB (RY) and DB (BY) output from the signal converter 13 are used.
Although PR, SPG, and SPB are generated, the luminance signals obtained by processing the luminance data signal DBY and the color difference data signals DB (RY) and DB (BY) by the D / A converters 15a, 15b, and 15c. The three primary color signals SPR, SPG, and SPB can also be generated by using SBY and the color difference signals SB (RY) and SB (BY).

FIG. 3 shows a luminance signal SBY and a color difference signal SB (R-
Y), SB (BY) using three primary color signals SPR, SPG, SPB
FIG. 2 is a diagram illustrating a configuration of a signal processing device 50 that generates a signal.
2 and FIG. 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 3, a digital luminance data signal DBY and a color difference data signal D
B (RY) and DB (BY) are D / A converters 15a, 15b,
15c, the luminance signal SBY and the color difference signal SB (R-
Y) and SB (BY).

The luminance signal SBY is supplied to the encoder 18 and also to one terminal of a resistor 52 via a buffer 51. Further, the voltage is supplied to one terminal of the resistor 54 via the buffer 53 and the buffer 55
Is supplied to the non-inverting input terminal of the operational amplifier 56 via

The color difference signal SB (RY) is supplied to the encoder 18
And supplied to one terminal of a resistor 59 via an amplifier 57 and a buffer 58. Further, the voltage is supplied to one terminal of the resistor 61 via the buffer 60.

The color difference signal SB (BY) is supplied to the encoder 18
And supplied to one terminal of a resistor 64 via an amplifier 62 and a buffer 63. Further, the voltage is supplied to one terminal of a resistor 66 via a buffer 65.

The other terminal of the resistor 52 is grounded via a resistor 67, and the other terminal of the resistor 59 is connected to a connection point Pa between the resistor 52 and the resistor 67.
Here, the resistance values of the resistor 52 and the resistor 67 are set equal. The color difference signal SB (RY) amplified by the amplifier 57
Is divided by a resistor 59 and a resistor 67, and the resistance value and the resistance of the resistor 59 are set so that the signal level becomes 1.371 times the signal level of the color difference signal SB (RY) before being amplified by the amplifier 57. The resistance value of the heater 67 is set. Therefore, the signal level at the connection point Pa is “(signal level of luminance signal SY +
1.371 × color difference signal S (RY) signal level) / 2 ”.

The input terminal of the amplifier 68 is connected to the connection point Pa, the gain of the amplifier 68 is set to “6 dB”, and “(signal level of the luminance signal SBY + 1.371 × color difference) Signal SB (RY) signal level),
That is, a red signal SPR can be obtained as shown by the above equation (4).

Similarly, the other terminal of the resistor 54 is grounded via a resistor 69, and the other terminal of the resistor 64 is connected to a connection point Pb between the resistor 54 and the resistor 69. . Here, the resistance values of the resistor 54 and the resistor 69 are set equal. The color difference signal S amplified by the amplifier 62
B (BY) is divided by a resistor 64 and a resistor 69,
2 so that the signal level becomes 1.732 times the signal level of the color difference signal SB (BY) before being amplified by
And the resistance value of the resistor 69 are set. For this reason, the level of the connection point Pb is represented by “(signal level of luminance signal SBY + 1.732 × signal level of color difference signal SB (BY)) /
2 ".

The input terminal of the amplifier 70 is connected to this connection point Pb, the gain of the amplifier 70 is set to “6 dB”, and “(signal level of luminance signal SY + 1.732 × color difference) Signal level of the signal S (BY)), that is, the blue signal SPB can be obtained as shown in the above equation (6).

Next, the other terminal of the resistor 61 is connected to the resistor 7
1 is grounded. Here, the resistor 61 and the resistor 71
Is set such that the signal level at the connection point Pc between the resistor 61 and the resistor 71 is 0.698 times the color difference signal SB (RY). One terminal of a resistor 73 is connected to this connection point Pc via a buffer 72.

The other terminal of the resistor 66 is grounded via the resistor 74. Here, the resistance values of the resistor 66 and the resistor 74 are set such that the signal level at the connection point Pd between the resistor 66 and the resistor 74 is 0.336 times the color difference signal SB (BY). This connection point Pd is connected to the resistor 7 via the buffer 75.
6 is connected to one terminal.

The resistor 73 is grounded via the resistor 77, and the other terminal of the resistor 76 is connected to a connection point Pe between the resistor 73 and the resistor 77. The resistance values of the resistor 73, the resistor 76, and the resistor 77 are set to be equal, and the signal level of the connection point Pe is “(0.698 × color difference signal S
B (RY) signal level + 0.336 × color difference signal SB (BY) signal level) / 2 ”.

The input terminal of the amplifier 78 is connected to this connection point Pe, the gain of the amplifier 78 is set to “6 dB”, and the signal level from the amplifier 78 is “0.698 ×
Signal level of color difference signal SB (RY) + 0.336 x color difference signal SB
(BY) signal level is supplied to the inverting input terminal of the operational amplifier 56.

In the operational amplifier 56, the output signal of the amplifier 78 is subtracted from the luminance signal SBY supplied via the buffer 55, and the “luminance signal SBY” is output from the operational amplifier 56.
Signal level−0.698 × signal level of color difference signal SB (RY) −0.336 × signal level of color difference signal SB (BY) ”, that is, the green signal SPG can be obtained as shown in the above equation (5).

As described above, the three primary color signals SP are obtained by using the analog luminance signal SBY and the color difference signals SB (RY) and SB (BY).
Since R, SPG, and SPB can be generated, a computer image can be displayed with good image quality on the screen of the television device 40 using the three primary color signals SPR, SPG, and SPB.

The signal processing devices 30 and 50 of the present invention
Can output one or both of the luminance signal SBY and the color signal SBC or the composite video signal SBCOMP.
A computer image can be displayed on the screen of the television device 40 without having a terminal capable of inputting PR, SPG, and SPB.

Further, the image displayed on the screen of the television device 40 is an image of a system different from that of television scanning, and is not limited to a computer image.

[0051]

According to the present invention, a signal for television scanning is generated by a signal conversion means from a signal different from that for television scanning, and a luminance signal and a chrominance signal of Y / C separation are generated from this signal by encoding means. Alternatively, one or both of the composite video signals are generated. Further, a three primary color signal is generated from this signal by the three primary color signal generating means.

Therefore, the signal conversion means and the three primary color signal generation means can obtain the three primary color signals of the television scanning from the signal of the system different from the television scanning.
By using these three primary color signals, it is possible to display an image of a system different from television scanning with good image quality on the screen of the television device.

Even when the three primary color signals cannot be input to the television device, since the luminance signal and the color signal of Y / C separation or the composite video signal are generated by the encoding means, the television device is used by using these signals. Can be displayed on the screen.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a system.

FIG. 2 is a diagram showing a configuration of an embodiment of a signal processing device according to the present invention.

FIG. 3 is a diagram showing a configuration of another embodiment of the signal processing device according to the present invention.

FIG. 4 is a diagram illustrating a configuration of a conventional signal processing device.

[Explanation of symbols]

 13 signal converter 17, 18 encoder 32a, 32b, 32c coefficient generator 33 adder / subtractor 35 synchronization separator

Claims (2)

[Claims] 1. A signal conversion means for processing a signal of a method different from television scanning to obtain a signal of a television scanning method, and a luminance signal Y / C separated from a signal obtained by the signal conversion means. A signal processing apparatus comprising: encoding means for outputting one or both of a color signal and a composite video signal; and three primary color signal generating means for generating a three primary color signal from the signal obtained by the signal converting means. 2. The signal processing apparatus according to claim 1, wherein said signal conversion means processes a signal of a system different from that of television scanning to obtain a luminance signal and a color difference signal of television scanning.