JPH05344444A - System converter for video signal - Google Patents

Abstract

PURPOSE:To obtain the system converter for a video signal converting a MUSE signal into a standard television signal with an excellent characteristic for color reproducibility with fidelity by implementing signal processing with specific color correction. CONSTITUTION:A color correction section 10 applies prescribed color correction processing corresponding to a luminance signal Y, and color difference signals R-Y, B-Y to three primary color signals R',G',B' generated from matrix calculation of a luminance signal Y, and color difference signals R-Y, B-Y obtained by demodulating a MUSE signal to generate three primary color signals R, G, B. Furthermore, an NTSC encoder section 11 implements prescribed encode processing based on the three primary color signals R, G, B subject to color correction to generate a composite standard television signal Vs or a component luminance signal Y and a chrominance signal C. The MUSE signal is converted into the standard television signal for picture display in full size mode with excellent color reproducibility through simple signal processing in this way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal format converter, and more particularly to a video signal format converter suitable for a MUSE signal / standard television signal converter for converting a MUSE signal into a standard television signal. ..

[0002]

2. Description of the Related Art In order to provide higher definition, higher quality and wider screen of television images, and to provide a clearer and more realistic image service than standard television systems,
High-definition broadcasting using MUSE signals is being put to practical use. In this high-definition broadcasting, unlike the standard television system, a high-definition high-definition image with 1125 scanning lines and an aspect ratio of 16: 9 is transmitted and received by a MUSE signal. The MUSE signal is formed in a form incompatible with the standard television system. For this reason, the MU can be received even with a standard television receiver.
Various inventions have been made to realize a system conversion device for converting a MUSE signal into a standard television signal so that the SE signal can be received. For this, for example,
JP-A-3-288693, JP-A-2-291790, JP-A-3-163
96, JP-A-3-55986, JP-A-3-57389, JP-A-3
-66274, JP-A-3-66275 and the like.

[0003]

Since the MUSE signal employs the pseudo constant brightness method, signal processing for transmission gamma correction and display gamma correction is necessary for faithful color reproduction on the image receiving side. However, in the prior art, in order to reduce the cost of the device, the signal processing is omitted. Therefore, there is a problem that faithful color reproduction cannot be performed with the converted standard television signal.

It is an object of the present invention to provide a MUSE signal / standard television signal conversion device capable of faithful color reproduction even with a standard television signal.

[0005]

In order to achieve the above object, in the present invention, a luminance signal is used for three primary color signals R ', G', B'of a MUSE signal demodulated by the same signal processing as in the prior art. Color correction signal processing determined corresponding to Y and color difference signals RY and BY is performed. Then, the color corrected three primary color signals R, G and B constitute a standard television signal.

[0006]

When the MUSE signal is subjected to normal transmission gamma correction and display gamma correction signal processing in the image receiving section, the three primary color signals Rs, Gs, Bs, the luminance signal Y, and the color difference signals RY, BY are obtained. The relationship of Formula 1 is established between the two.

[0007]

[Equation 1]

Here, γ is a characteristic of display gamma.

On the other hand, the three primary color signals R ', G', and B'obtained when the signal processing of the transmission gamma correction and the display gamma correction is omitted in the image receiving unit are shown in equation (2).

[0010]

[Equation 2]

Here, Γ is the characteristic of transmission gamma.

Therefore, the three primary color signals R ', G',
B'is different from the normal three primary color signals Rs, Gs, Bs. Therefore, if a standard television signal is composed of the three primary color signals R ', G', and B ', faithful color reproduction cannot be performed.

Therefore, in the present invention, color correction coefficients CR, CG, CB are applied to the three primary color signals R ', G', B '.
Then, the color correction process is performed to generate the three primary color signals R, G, B shown in Expression 3.

[0014]

[Equation 3]

Here, the color correction coefficient is expressed by the following equations 1 and 2
Can be obtained by substituting, and each of them becomes the one shown in Equation 4.

[0016]

[Equation 4]

Therefore, the luminance signal Y and the color difference signal R-
The chromaticity signal CCR ((R-
Y) / Y), CCB ((BY) / Y) is used to perform color correction processing of the three primary color signals R ', G', B'using the color correction coefficients CR, CG, CB of Equation 4. By doing
It is possible to generate the same three primary color signals R, G, B as in the case where the normal transmission gamma correction and the display gamma correction are performed. By constructing a standard television signal with these three primary color signals R, G, B, a standard television signal with good color reproducibility for faithful color reproduction can be generated.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the block diagram shown in FIG. This is suitable for conversion into a standard television signal for displaying an image in a full size mode in which a non-image area is provided above and below the display screen to display a horizontally long image.

The MUSE signal is sampled by the A / D converter 1 at a 16.2 MHz clock, for example, and converted into a digital signal. FM in the de-emphasis section 2
Predetermined de-emphasis processing is performed to restore the non-linear emphasis for transmission. In addition, the PLL circuit unit 4
Then, various control signals synchronized with the MUSE signal system,
The PLL circuit section 5 produces various control signals synchronized with the standard television signal system.

The time axis converter 3 has 1125 scanning lines,
From the MUSE signal with an aspect ratio of 16: 9, 1050 signals, whose upper and lower sides are discarded, are written into a memory, and the signals are read out at a rate of a standard television signal system to perform time axis conversion processing. Create a signal sequence.

The luminance signal processing unit 6 performs a field interpolation process by a field interpolation filter and a scan conversion process to 2: 1 interlaced scanning with 525 scanning lines. In addition, in the field interpolation, aliasing distortion occurs due to inter-frame offset sub-sampling in a still image. Therefore, it is also possible to perform motion adaptive signal processing in which field interpolation is combined with aliasing removal by inter-frame offset samples. On the other hand, the color signal processing unit 7 performs TCI demodulation processing, field interpolation processing, and scan conversion processing to generate color difference signals RY and BY of 525 scanning lines and 2: 1 interlaced scanning. By these signal processings, the luminance signal Y and the color difference signals RY and BY in the form shown in FIG. 2B are created.

The scanning line conversion unit 8 performs a scanning line number conversion process such as 4 to 3 conversion of scanning lines, and a luminance signal Y having a form of 360 effective pixel scanning lines as shown in FIG. 2C. ', Color difference signals R-Y', BY 'are produced.

The matrix section 9 carries out a predetermined operation shown in the equation 5 on these signals, and outputs the three primary color signals R ',
Make G'and B '.

[0024]

[Equation 5]

In the color correction section 10, the signals Y ', RY',
Chromaticity signal CCR ((RY ') / determined by BY'
Y '), CCB ((B-Y') / Y ') are used to create the color correction coefficients CR, CG, CB shown in the equation (4) for each of the three primary color signals R', G ', B'. The color correction coefficients are weighted to generate the color-corrected three primary color signals R, G, B.

The NTSC encoder unit 11 performs a predetermined encoding process on the basis of the color-corrected three primary color signals R, G, B, and a composite standard television signal Vs or a component luminance signal Y, The color signal C is generated.

According to this embodiment, the MU can be processed by simple signal processing.
A device for converting an SE signal into a standard television signal for image display in a full-size mode with good color reproducibility can be realized.

Next, a second embodiment of the present invention will be described with reference to the block diagram shown in FIG. This is suitable for cutting a part of an image with a horizontally long aspect ratio to match the aspect ratio of the display screen, and converting it into a standard television signal for displaying a wide mode image that fills the display screen. ..

The MUSE signal is sampled by the A / D converter 1 at, for example, a 16.2 MHz clock and converted into a digital signal. And de-emphasis section 2
Then, a predetermined de-emphasis process for returning the non-linear emphasis for FM transmission is performed. Further, the PLL circuit unit 4 is provided with various control signals of the MUSE signal system, PL
The L circuit section 5 produces various control signals of the standard television signal system synchronized with the MUSE signal.

The time axis conversion unit 3 has 1125 scanning lines,
The MUSE signal with an aspect ratio of 16: 9 is written to the memory by writing 1050 lines with the upper and lower sides, left and right truncated, and the aspect ratio of 4: 3 into the memory, and reading it at the rate of the standard television signal system to perform the time axis conversion processing. Then, a signal sequence with 1050 scanning lines is created.

The luminance signal processing section 6 performs the field interpolation processing by the field interpolation filter and the scan conversion processing, and the number of scanning lines is 5 as shown in FIG. 4B.
A luminance signal Y of 25 lines and 2: 1 interlaced scanning is created. In the field interpolation, aliasing distortion occurs due to the inter-frame offset sample in the still image portion. Therefore, it is also possible to adopt a method of performing motion adaptive signal processing in which field interpolation is combined with aliasing removal by inter-frame offset samples. On the other hand, the color signal processing unit 7 performs TCI demodulation processing, field interpolation processing and scan conversion processing to obtain a color difference signal of 2: 1 interlaced scanning with 525 scanning lines in the form shown in FIG. 4B. Make RY and BY.

The matrix section 9 performs the predetermined arithmetic operation shown in the equation 5 on these signals to generate the three primary color signals R ', G', B '.

In the color correction section 10, the signals Y, RY, B-
Chromaticity signal CCR ((RY) / Y) determined by Y, CCB
Based on ((B−Y) / Y), the color correction coefficients CR, CG, and CB shown in Formula 4 are created, and the three primary color signals R ′, G ′,
A color correction coefficient is weighted on each of B'to generate color-corrected three primary color signals R, G, B.

The NTSC encoder section 11 performs a predetermined encoding process on the color-corrected three primary color signals R, G and B to obtain a composite standard television signal Vs or a component luminance signal Y and color signal. Generate C.

According to this embodiment, MU can be processed by simple signal processing.
An apparatus for converting an SE signal into a standard television signal with good color reproducibility for displaying an image in a wide mode can be realized.

Next, a third embodiment of the present invention will be described with reference to the block diagram shown in FIG. This is suitable for conversion into a standard television signal for displaying an image in a squeeze mode in which a vertically long image having a circularity different from 1 is displayed on the entire display screen.

The MUSE signal is sampled by the A / D converter 1 at a clock of 16.2 MHz, for example, and converted into a digital signal. Then, the de-emphasis unit 2 performs a predetermined de-emphasis process for returning the non-linear emphasis for FM transmission. Also, PLL
The circuit section 4 includes various control signals of the MUSE signal system, P
The LL circuit section 5 produces various control signals of the standard television signal system synchronized with the MUSE signal.

The time axis converter 3 has 1125 scanning lines,
The 1050 signals, which are truncated from the MUSE signal with an aspect ratio of 16: 9, are written to the memory and read out at the rate of the standard television signal system, and the time axis conversion process is performed to obtain a signal series with 1050 scanning lines. to make.

The luminance signal processing unit 6 performs the field interpolation processing by the field interpolation filter and the scan conversion processing, and the number of scanning lines in the form as shown in FIG. 6B.
A luminance signal Y for 525 lines and 2: 1 interlaced scanning is created. In the field interpolation, aliasing distortion occurs in the still image portion due to the inter-frame offset sample. Therefore,
It is also possible to adopt a method of performing motion adaptive signal processing in which field interpolation is combined with aliasing removal by inter-frame offset samples.

On the other hand, the color signal processing unit 7 performs TCI demodulation processing, field interpolation processing, and scan conversion processing, and the number of scanning lines is 525, 2: 1 in the form shown in FIG. 6B.
Interlaced scanning color difference signals RY and BY are created.

The matrix section 9 performs the predetermined calculation shown in the above equation 5 on these signals to generate the three primary color signals R ', G', B '.

In the color correction section 10, the signals Y, RY, B-
Chromaticity signal CCR ((RY) / Y) determined by Y, CCB
Based on ((B−Y) / Y), the color correction coefficients CR, CG, and CB shown in Formula 4 are created, and the three primary color signals R ′, G ′,
Color correction was performed by weighting each of B ′ with a color correction coefficient.
Produces primary color signals R, G, B.

The NTSC encoding unit 11 performs a predetermined encoding process on the color-corrected three primary color signals R, G and B to obtain a composite standard television signal V.
s or component luminance signal Y and color signal C
To generate.

As described above, according to the present embodiment, it is possible to realize a device for converting a MUSE signal into a standard television signal with good color reproducibility for displaying an image in the squeeze mode by simple signal processing.

Next, a fourth embodiment of the present invention will be described with reference to the block diagram shown in FIG. This is full mode,
It is suitable for selecting either one of the wide mode and the squeeze mode and converting the standard television signal for image display.

The MUSE signal is sampled by the A / D converter 1 at a clock of 16.2 MHz, for example, and converted into a digital signal. Then, the de-emphasis unit 2 performs a predetermined de-emphasis process for returning the non-linear emphasis for FM transmission. Also, PLL
The circuit section 4 includes various control signals of the MUSE signal system, P
The LL circuit section 5 produces various control signals of the standard television signal system synchronized with the MUSE signal.

The time axis converter 3 has 1125 scanning lines,
From the MUSE signal with an aspect ratio of 16: 9, 1050 signals were truncated at the top and bottom in the full mode and squeeze mode, and 10 signals were truncated at the top and bottom in the wide mode.
A signal with 50 lines and an aspect ratio of 4: 3 is written in a memory, and a time axis conversion process is performed to read it out at a rate of a standard television signal system to form a signal sequence with 1050 scanning lines.

The luminance signal processing unit 6 performs a field interpolation process by a field interpolation filter and a scan conversion process to generate a luminance signal Y of 525 scanning lines and 2: 1 interlaced scanning. In the field interpolation, aliasing distortion occurs in the still image portion due to the inter-frame offset sample. Therefore, it is also possible to adopt a method of performing motion adaptive signal processing in which field interpolation is combined with aliasing removal by inter-frame offset samples.

On the other hand, the color signal processing unit 7 performs TCI demodulation processing, field interpolation processing, and scan conversion processing, and the color difference signals RY and BY of the number of scanning lines 525 and 2: 1 interlaced scanning. To make.

The scanning line conversion section 8 performs a scanning line number conversion process such as 4 to 3 scanning line conversion, and produces a luminance signal and a color difference signal corresponding to the full mode with 360 effective pixel scanning lines. Then, the selection circuit 12 selects and outputs the signal of the scanning line conversion unit 8 in the full mode, and the signals of the luminance signal processing unit 6 and the color signal processing unit 7 in the other wide modes and squeeze modes.

In the matrix section 9, these luminance signals Y,
The calculation shown in the equation (5) is performed on the color difference signals RY and BY to generate the three primary color signals R ', G', and B '.

In the color correction unit 10, the signals Y, RY, B-
Chromaticity signal CCR ((RY) / Y) determined by Y, CCB
Based on ((B−Y) / Y), the color correction coefficients CR, CG, and CB shown in Formula 4 are created, and the three primary color signals R ′, G ′,
Color correction was performed by weighting each of B ′ with a color correction coefficient.
Produces primary color signals R, G, B.

The NTSC encoder unit 11 performs a predetermined encoding process on the color-corrected three primary color signals R, G, B to obtain a composite standard television signal V.
s, or the luminance signal Y and the color signal C of the component are generated.

According to the present embodiment, it is possible to realize a device for selecting a full mode, a wide mode, or a squeeze mode by simple signal processing and converting into a standard television signal with good color reproducibility for image display.

Next, a block diagram of each of the above-described embodiments will be described. The de-emphasis section 2,
Time axis conversion unit 3, PLL circuit unit 4, 5, luminance signal processing unit 6, color signal processing unit 7, scanning line conversion unit 8, matrix unit 9
Since it can be easily realized by the conventional technique, the description thereof will be omitted.

FIG. 8 is a block diagram of an embodiment of the color correction section 10. In the arithmetic circuit 13, (RY) /
Y, (B−Y) / Y is calculated to obtain the chromaticity signal CC
Create R and CCB. The correction coefficient generating circuit 14 performs the calculation shown in the equation 4 based on the luminance signal Y and the chromaticity signals CCR and CCB to generate color correction coefficients CR, CG and CB. R
In the signal correction circuit 15, CR / R 'is calculated to produce a color-corrected signal R. B signal correction circuit 16, G
In the signal correction circuit 17, CB · B ′ and CG · G ′, respectively.
Is performed to generate color-corrected signals B and G.

The arithmetic circuit, the correction coefficient generating circuit, and the correction circuit can be realized by a ROM, and one embodiment thereof is shown in FIG. FIG. 3A shows an example of the arithmetic circuit, which is used for signals Y and RY.
(RY) / Y ((BY) is calculated by a table lookup in which (BY) is associated with the input address of the ROM circuit 18.
The result of Y) / Y) is output. Further, FIG. 7B shows an example of the correction coefficient generating circuit, which outputs signals Y, CCR, CCB to RO.
The table lookup corresponding to the input address of the M circuit 18 outputs the results of the operation shown in Formula 4 as color correction coefficients CR, CB, and CG, respectively. FIG. 3C shows an example of the correction circuit, which is used for the signal R'and the color correction coefficient CR in the ROM circuit
The result of the operation CR · R ′ is output by the table lookup corresponding to the input address of 8.

Next, an embodiment of the NTSC encoder section 11 is shown in FIG. The YIQ conversion section 19 converts the three primary color signals R, G, B into a luminance signal Y and color difference signals I, Q of a standard television system by matrix calculation. The color modulator 20 orthogonally modulates the color difference signals I and Q with the color subcarrier fsc to generate a color signal C. The multiplexing unit 21 adds the color signal C to the luminance signal Y to form a composite-type signal. Further, the process unit 22 adds a predetermined signal such as a synchronization signal or a burst signal. Then, the D / A converter 23 converts the analog signal into an analog signal to form a composite standard television signal Vs, or a component brightness signal Y and a color signal C.

Next, a fifth embodiment of the present invention will be described with reference to the block diagram shown in FIG. This is suitable for image reproduction of standard television signals down-converted from standard television signals and MUSE signals.

The MUSE signal is sampled by the A / D converter 1 at a clock of 16.2 MHz, for example, and converted into a digital signal. Then, the de-emphasis unit 2 performs a predetermined de-emphasis process for returning the non-linear emphasis for FM transmission. Also, PLL
The circuit section 4 has various control signals of the MUSE signal system, P
The LL circuit section 5 produces various control signals of the standard television signal system synchronized with the MUSE signal.

The time axis conversion unit 3 has 1125 scanning lines,
The 1050 signals, which are truncated from the MUSE signal with an aspect ratio of 16: 9, are written to the memory and read out at the rate of the standard television signal system, and the time axis conversion process is performed to obtain a signal series with 1050 scanning lines. to make.

The luminance signal processing section 6 performs the field interpolation and the scan conversion processing by the field interpolation filter to produce the luminance signal Y of 525 scanning lines and 2: 1 interlaced scanning. Since field-interpolation causes aliasing distortion due to inter-frame offset samples in the still image portion, it can be configured by a method of performing motion-adaptive signal processing combined with aliasing removal by inter-frame offset samples.

On the other hand, in the color signal processing unit 7, TCI demodulation,
Field interpolation and scan conversion are performed, and color difference signal R- of 2: 1 interlaced scan with 525 scanning lines.
Make Y, BY.

The scanning line conversion unit 8 performs scanning line number conversion processing such as 4 to 3 conversion of the scanning lines, and the luminance signal Y ', which has 360 effective pixel scanning lines corresponding to the full-mode image display, Color difference signals RY 'and BY' are produced.

The matrix section 9 performs the predetermined calculation shown in the above equation 5 on these signals to generate the three primary color signals R ', G', B '.

In the color correction section 10, the signals Y ', RY',
Chromaticity signal CCR ((RY ') / determined by BY'
Y '), CCB ((B-Y') / Y ')
The color correction coefficients CR, CG, and CB shown in FIG. 3 are created, and the color correction coefficient is weighted to each of the three primary color signals R ′, G ′, and B ′, and the color-corrected three primary color signals R, G, and B are generated. to make.

On the other hand, the NTSC signal of the standard television system is subjected to a predetermined demodulation processing in the NTSC decoder section 24 to demodulate the three primary color signals R, G and B.

The selection circuit 25 selects and outputs one of them, and the D / A converter 26 converts it into an analog signal. Then, an image is displayed on the display unit 27 in the form of 2: 1 interlaced scanning with 525 scanning lines.

According to the present embodiment, a device capable of receiving both standard television signals and MUSE signals can be realized by simple signal processing.

Next, a sixth embodiment of the present invention will be described with reference to the block diagram shown in FIG. This is suitable for displaying the reproduced images of the standard television signal and the MUSE signal in the form of progressive scanning.

The MUSE signal is sampled by the A / D converter 1 at a clock of 16.2 MHz, for example, and converted into a digital signal. Then, the de-emphasis unit 2 performs a de-emphasis process for returning the non-linear emphasis for FM transmission. Further, the PLL circuit section 4 produces various control signals of the MUSE signal system, and the PLL circuit section 5 produces various control signals of the standard television signal system synchronized with the MUSE signal.

The time axis conversion unit 3 has 1125 scanning lines,
The 1050 signals, which are truncated from the MUSE signal with an aspect ratio of 16: 9, are written to the memory and read out at the rate of the standard television signal system, and the time axis conversion process is performed to obtain a signal series with 1050 scanning lines. to make.

The luminance signal processing section 6 carries out field interpolation and scan conversion processing by a field interpolation filter to produce a luminance signal Y of 2: 1 interlaced scanning with 525 scanning lines. In the field interpolation, aliasing distortion occurs due to the inter-frame offset sample in the still image portion. Therefore, it is possible to adopt a method of performing motion adaptive signal processing in which aliasing removal due to the inter-frame offset sample is combined. ..

On the other hand, in the color signal processing unit 7, TCI demodulation,
Field interpolation and scan conversion are performed, and color difference signal R- of 2: 1 interlaced scan with 525 scanning lines.
Make Y, BY.

The scanning line conversion unit 8 performs scanning line number conversion processing such as 4 to 3 conversion of scanning lines, and the luminance signal Y ', which has 360 effective pixel scanning lines corresponding to the full mode image display, Color difference signals RY 'and BY' are produced.

The matrix section 9 performs the calculation shown in the above equation 5 on these signals and outputs the three primary color signals R ',
Make G'and B '.

In the color correction section 10, the signals Y ', RY',
Chromaticity signal CCR ((RY ') / determined by BY'
Y '), CCB ((B-Y') / Y ')
The color correction coefficients CR, CG, and CB shown in FIG. 2 are created, and the color correction coefficients are weighted to the respective three primary color signals R ', G', and B ', and the color corrected three primary color signals R, G, B are created.

On the other hand, the NTSC signal of the standard television system is subjected to a predetermined demodulation processing in the NTSC decoder section 24 to demodulate the three primary color signals R, G and B.

The selection circuit 25 selects and outputs one of the series signals.

In the progressive scan conversion unit 28, the signals of the scan lines skipped by the interlaced scan are generated by the motion adaptive scan line interpolation processing or the like, and the scan conversion into the signal of the 1: 1 progressive scan mode is performed.

The D / A converter 29 converts the signal into an analog signal, and the progressive scan display 30 displays an image in the form of 525 scanning lines and 1: 1 progressive scan.

According to this embodiment, an apparatus for receiving both standard television signals and MUSE signals in the form of progressive scanning can be realized by simple signal processing.

Next, an embodiment of the NTSC decoder section 24 in the fifth and sixth embodiments of the present invention is shown in FIG.

The standard television NTSC signal is
The A / D converter 31 samples at a sampling frequency four times as high as the color subcarrier fsc, for example, and converts it into a digital signal.

In the YC separation section 32, for example, a two-dimensional Y
The luminance signal Y and the color signal C are separated by C separation processing or three-dimensional motion adaptive YC separation processing.

The color demodulation section 33 synchronously detects the color signal C with the color subcarrier fsc to demodulate the color difference signals I and Q.

The luminance signal and the color difference signals I and Q whose time delays have been adjusted by the delay circuit 34 are converted into three primary color signals R, G and B by performing a predetermined matrix operation in the RGB conversion section 35.

In the fifth and sixth embodiments, MUSE is used.
The conversion from the signal to the standard television signal has been described by taking the image display in the full mode as an example, but the same configuration can be easily used in the case of the image display mode in which the wide mode, the squeeze mode or the three kinds of modes are selected. Can be realized.

[0089]

According to the present invention, a video signal format conversion apparatus for converting a MUSE signal into a standard television signal with a characteristic of excellent color reproducibility for faithful color reproduction by simple color correction signal processing. Can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of this signal processing.

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

FIG. 4 is an explanatory diagram of this signal processing.

FIG. 5 is a block diagram of a third embodiment of the present invention.

FIG. 6 is an explanatory diagram of this signal processing.

FIG. 7 is a block diagram of a fourth embodiment of the present invention.

FIG. 8 is a block diagram of a color correction unit in the first to fourth embodiments.

FIG. 9 is a circuit diagram of a color correction unit, a correction coefficient generation circuit, and a correction circuit diagram.

FIG. 10 is a block diagram of an embodiment of an NTSC encoder section in the first to fourth embodiments.

FIG. 11 is a block diagram of a fifth embodiment of the present invention.

FIG. 12 is a block diagram of a sixth embodiment of the present invention.

FIG. 13 is a block diagram of an NTSC decoder section in fifth and sixth embodiments.

[Explanation of symbols]

1 ... A / D conversion unit, 2 ... De-emphasis unit, 3 ... Time axis conversion unit, 4, 5 ... PLL circuit unit, 6 ... Luminance signal processing unit, 7 ... Color signal processing unit, 8 ... Scan line conversion unit, 9 ... Matrix section, 10 ... Color correction section, 11 ... NTSC encoder section.

Claims (6)

[Claims] 1. A matrix of a luminance signal Y, color difference signals RY, BY obtained by demodulating the MUSE signal in a MUSE signal / standard television signal conversion device for converting a MUSE signal into a standard television signal. Means for performing a predetermined color correction process corresponding to the luminance signal Y and the color difference signals RY and BY on the three primary color signals R ', G', and B'generated by the calculation are provided. A video signal format conversion device characterized in that a standard television signal is constituted by three primary color signals R, G, B obtained by a correction process. 2. The standard television signal according to claim 1, wherein a non-picture area is provided above and below a display screen.
A format conversion device for a video signal which is a signal for displaying an image in a full size mode for displaying an image having a horizontally long aspect ratio different from the TSC system. 3. The standard television signal according to claim 1, wherein a part of a horizontally long image having an aspect ratio different from that of the current NTSC system is cut to fill the display screen in accordance with the aspect ratio of the display screen. A format conversion device for a video signal which is a signal for displaying a wide mode image to be displayed. 4. The squeeze according to claim 1, wherein the standard television signal is a squeeze for displaying a horizontally long image having an aspect ratio different from that of the current NTSC system as a vertically long image having a roundness different from 1. A system converter for a video signal which is a signal for displaying a mode image. 5. The standard television signal as defined in any one of claims 1, 2, 3 and 4, which is one of the full size mode image display, the wide mode image display and the squeeze mode image display. A video signal format conversion device for selecting and displaying an image. 6. A progressive scanning conversion means for converting a 2: 1 interlaced scanning type signal sequence into a 1: 1 progressive scanning type signal sequence according to claim 1, 2, 3, 4, or 5. A video signal format conversion device for displaying an image in the form of 1: 1 progressive scanning.