JPH06296286A - Television signal processing circuit - Google Patents

Abstract

PURPOSE:To attain high picture quality by effectively using memory. CONSTITUTION:A first switching means 17 switches a luminance signal from a YNR 15 and a luminance signal from a sequential scan processing means 8 corresponding to a MUSE/NTSC switching signal 13, and outputs either of them. Frame memory 18 outputs by delaying the luminance signal from the YNR 15 by one frame, and outputs by delaying the luminance signal from the sequential scan processing means 8 by one field. A second switching means 19 switches a color difference signal from a CNR 16 and a color difference signal from a sequential scan processing means 10, and outputs either of them. Frame memory 20 outputs by delaying the color difference signal from the CNR 16 by one frame, and outputs by delaying the color difference signal from the sequential scan processing means 10 by one field.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television signal processing circuit for improving image quality in a television system capable of receiving both high definition television and current television.

[0002]

2. Description of the Related Art Current television (hereinafter referred to as TV)
Research on TVs with the above high image quality is being carried out in various countries around the world. For example, in Japan, EDTV (Clear Vision; Exte
Neded Definition TV) is also being put into practical use as a high definition television (hereinafter referred to as HDTV), which is one of the incompatible types, and the high definition of the MUSE system.

Here, the EDTV is described in "Clearvision Handbook, edited by Clearvision Promotion Council, Kenrokukan Publishing". Regarding the MUSE method, "Development of MUSE method, Ninomiya et al. 4, NH
K Technology Research, Showa 62, Vol. 39, No. 2 ".

As a conventional example in which the EDTV and the MUSE high-definition system are integrated, there is, for example, a "standard / high-definition television receiver" described in Japanese Patent Application No. 1-56461. This conventional example is shown in FIG. 4, and its operation will be described below.

The MUSE signal input from the input terminal 2 is separated into a luminance signal and a color difference signal in the luminance signal processing means 3 in the decoding processing circuit 1, and the color difference signal is directly output to the color difference signal processing means 4. The luminance signal is subjected to still image processing, moving image processing, still image / moving image mixing processing, low-frequency replacement processing, and the like.

The color difference signal input to the color difference signal processing means 4 is subjected to time expansion (TCI decoding), still picture processing, moving picture processing, still picture / moving picture mix processing, line sequential interpolation processing, etc. in the color difference signal processing means 4. Is applied.

Further, in the ED processing circuit 5, the NTSC signal is inputted from the input terminal 6, and the YC separation means 7 separates the luminance signal and the color difference signal. The luminance signal and the color difference signal separated by the YC separation means 7 are subjected to motion adaptive processing by the sequential scanning processing means 8 and 10, respectively, and converted into a non-interlaced scanning signal. This motion-adaptive non-interlaced scan conversion, depending on the motion of the image,
This is a method of switching between inter-field interpolation in which the output signals of the field memories 9 and 11 are used as interpolation scanning lines and intra-field interpolation in which interpolation is performed by scanning lines in the vicinity of the same field.

After that, the video signal composed of the luminance signal and the color difference signal respectively obtained by the decoding processing circuit 1 and the ED processing circuit 5 is switched by the output switching means 12 by the MUSE / NTSC switching signal 13, and the display 14 of the receiver. Is output to.

[0009]

In the above-mentioned prior art, M
In USE / NTSC integrated TV system, MU
The decoding processing circuit 1 for decoding the SE signal into the original high-definition signal and the ED processing circuit 5 for performing the ED processing on the NTSC signal are separately provided, and no particular device for improving the image quality has been made.

An object of the present invention is to focus on the fact that a large amount of memory is used individually in the decoding processing circuit and the ED processing circuit in the HDTV / current TV integrated television system, and these memories are effectively utilized. And to improve the image quality.

[0011]

In order to achieve the above object, according to the present invention, a motion-adaptive frame-type NR (noise reduce) circuit for the purpose of improving image quality is provided after decoding an HDTV signal for transmission. Is provided.

Further, a memory for the frame type NR is
The configuration is such that it can be used as a field memory used in the motion-adaptive progressive scan processing means for improving image quality of the current TV.

[0013]

The frame type NR circuit in the latter stage of the transmission HDTV signal decoding circuit is provided with a signal in which the video signal restored to the original wide band signal by the decoding process is delayed by one frame or cycled by the frame memory. Noise is reduced by taking frame correlation, discriminating a component having no frame correlation as noise, and subtracting the component from the current video signal.

Further, the frame memory used in the frame type NR circuit operates as a field memory for inter-field interpolation for a still image when receiving a current TV signal.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. First, the outline of the configuration and operation of this embodiment will be described with reference to FIG. 1, and then the specific configuration and operation of FIG. 2 will be described. In addition, MUS as HDTV
The E system will be described by taking NTSC as an example of the current TV.

FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, 15 is YNR (luminance noise reducer), 16 is CNR (chroma noise reducer),
Reference numerals 18 and 20 denote frame memories, 17 denotes a first input switching processing means, 19 denotes a second input switching processing means, and the others have the same configuration as the conventional example of FIG.

In FIG. 1, for example, an unillustrated A / D
A digital MUSE signal is input from the converter via the input terminal 2 and guided to the luminance signal processing means 3.
The luminance signal processing means 3 separates the input MUSE signal into a luminance signal and a color difference signal, and outputs the color difference signal as it is to the color difference signal processing means 4 as in the conventional example of FIG. Performs a still image process, a moving image process, a still image / moving image mix process, a low-frequency replacement process, and the like, which are equivalent to a normal MUSE decoding process, and outputs the result to YNR 15.

The YNR 15 reduces noise having no frame correlation in the input luminance signal. Here, as will be described later, the difference between the luminance signal and the signal obtained by delaying the luminance signal by one frame by the frame memory 18 is obtained, and when the difference is small, it is subtracted as noise from the current signal to obtain the S / L of the luminance signal. We are improving N.

Further, in the color difference signal processing means 4, as in the conventional example of FIG.
Time expansion (TCI decoding), still image processing, moving image processing, still image / moving image mixing processing, line-sequential interpolation processing, and the like, which are equivalent to the USE decoding processing, are performed and output to the CNR 16.

In the case of color difference signals, in order to improve the image quality, C
NR16 reduces noise having no frame correlation in the input color difference signal. Here, as will be described later, the difference between the color difference signal and the signal obtained by delaying the color difference signal by one frame by the frame memory 20 is obtained, and when the difference is small, it is subtracted from the current signal as noise, so that the S / We are improving N.

On the other hand, for example, an analog NTSC signal is converted into a digital signal by an A / D converter (not shown), and the digital NTSC signal is input from the input terminal 6 and guided to the YC separation means 7. YC separation means 7
Then, the frequency-multiplexed video signal is separated into a luminance signal and a color difference signal by using a horizontal, vertical, and time three-dimensional filter, and the luminance signal is sequentially scanned by the scanning unit 8 and the color difference signal is sequentially scanned by the scanning unit 10. To each output.

In the progressive scanning processing means 8 and 10, the video signals separated into the luminance signal and the color difference signals are subjected to motion adaptive scanning line conversion processing, respectively, and converted into non-interlaced signals. Here, as will be described later, data of the previous field is used for a still image, and data obtained by averaging the previous line and the current line is used for a moving image to create an interpolated scan line. In this embodiment, YN is used as the field delay means used for the inter-field interpolation applied to this still image.
The frame memory 18 for R7 and the frame memory 20 for CNR16 are used.

Therefore, in this embodiment, the input switching means 17, 1 are provided in front of the frame memories 18, 20, respectively.
9 is provided. The first input switching means 17 is YN
In order to obtain the luminance signal delayed by one frame for use in the processing of R15, the luminance signal input from the YNR15 and the luminance signal delayed by one field used in the sequential scanning processing of the still image in the sequential scanning processing means 8 are obtained. Therefore, the luminance signal input from the progressive scan processing means 8 is
It switches according to the E / NTSC switching signal 13 and inputs either one to the frame memory 18.

The second input switching means 19 is C
In order to obtain the color difference signal delayed by one frame used in the processing at NR16, the color difference signal input from CNR16,
In order to obtain a color-difference signal delayed by one field used in the progressive-scan processing for a still image in the progressive-scan processing means 10, the color-difference signal input from the progressive-scan processing means 10 is supplied in accordance with the MUSE / NTSC switching signal 13. After switching, either one is input to the frame memory 20.
In FIG. 1, the input switching means 17, 19 are HD
The case where TV is selected is shown.

Next, FIG. 2 shows a specific structural example of the NR and the progressive scanning processing means in FIG. To simplify the explanation, here, the luminance signal and the color difference signal (2
One system of the processing circuit of (color) is shown. That is, in the case of the luminance signal processing circuit, the block 209 in FIG.
2, the block 309 in FIG. 2 is the progressive scan processing means 8 in FIG. 1, the selector 202 in FIG. 2 is the input switching means 17 in FIG. 1, and the frame / field delay means 203 in FIG.
In the frame memory 18 respectively. In the case of the color difference signal processing circuit, the block 209 in FIG. 2 is the CRN 16 in FIG. 1, the block 309 in FIG. 2 is the progressive scan processing means 10 in FIG. 1, and the selector 202 in FIG. 2 is the input switching means in FIG. 19, the frame / field delay means 203 in FIG. 2 corresponds to the frame memory 20 in FIG. 1, respectively.

In FIG. 2, 201 is MUSE.
An input terminal for inputting a video signal obtained from the signal, 13 is a MUSE / NTSC switching signal input terminal, 204 is a subtractor, 205 is a multiplier that multiplies a constant K, 206 is an adder, and 207 is a motion of the video of the MUSE signal. A motion signal input terminal for inputting a motion signal indicating a region, 208 is an adder 20
6 is an output terminal for outputting the addition output of 6. On the other hand, 301
Is an input terminal for inputting a video signal obtained from the NTSC signal, 302 is a line memory for delaying at least one line of the image, 303 is an adder, 304 is a multiplier by 1/2, and 305 is a motion of the image of the NTSC signal. A motion signal input terminal for inputting a motion signal indicating a region, 306 is a multiplier 30
MIX circuit (mixing circuit) for mixing the output signal of No. 4 and the frame / field delay means 203, 307 for the current signal and M
Double speed converter for switching output signal of IX circuit 306, 3
Reference numeral 08 is an output terminal for outputting the conversion output of the double speed converter 207.

When receiving and processing the MUSE signal, the video signal is input to the input terminal 201 and guided to the subtractor 204. The video signal from the input terminal 201 is switched by the selector 202 and output to the frame / field delay means 203. Here, the frame / field delay means 203 is controlled so as to operate as one frame delay means for the high-definition signal in accordance with the signal from the MUSE / NTSC switching signal input terminal 13. The video signal delayed by the frame / field delay means 203 is guided to the subtractor 204. Subtractor 20
In 4, the video signal that is currently arriving is subtracted from the output signal of the frame / field delay means 203, and the multiplier 2
Output to 05.

The multiplier 205 multiplies the output signal of the subtractor 204 by K. Here, the value of K is the motion signal input terminal 20.
It is changed from 0 to 1/2 according to the motion signal from 7. For example, when the motion is large, K is set to 0, the output of the multiplier 205 is set to 0, and only the video signal currently arriving is output from the output terminal 208. Also,
When there is little movement, K is made close to 1/2 to increase the noise reduction effect. Thereby, the S / N improvement effect can be changed according to the magnitude of the motion, and the motion adaptive noise reducer can be realized.

On the other hand, when receiving and processing the NTSC signal, the video signal is input to the input terminal 301 and guided to the line memory 302 and the adder 303, respectively. The output signal of the line memory 302 is switched by the selector 202 and output to the frame / field delay means 203. Here, the frame / field delay means 203 is
In response to the signal from the MUSE / NTSC switching signal 13, it is controlled to operate as a 1-field delay unit for the NTSC signal. The video signal delayed by the frame / field delay means 203 is guided to the MIX circuit 306.

In the adder 303, the line memory 3
The output signal of 02 and the video signal input from the input terminal 301 are added and output to the multiplier 304. The multiplier 304 multiplies the output signal of the adder 303 by 1/2 and outputs it to the MIX circuit 306. In the MIX circuit 306, the video signal delayed by one field by the frame / field delay means 203 and the output signal of the multiplier 304 are switched according to the motion signal from the motion signal input terminal 305, and the double speed converter 207 is switched. Output to. In the double speed converter 207, M
The time axis of the output signal of the IX circuit 306 and the time axis of the video signal input from the input terminal 301 are respectively compressed to ½, and then alternately switched every scanning line time of non-interlaced scanning to the output terminal 308. Output.

As described above, according to this embodiment, the MUS
By applying the noise reduction process in the latter stage of the E decoding process, noise reduction can be performed on all of the motion area processing signal, the still area processing signal, and the low-frequency replacement processing component, and good image quality can be obtained. On the other hand, motion adaptive non-interlace processing can be applied to NTSC signal processing, and high image quality can be provided. Further, in this case, the noise reduction process and the non-interlace process are configured so that the same memory is switched and used, so that there is no problem of price increase due to increase in memory capacity.

The configuration of NR shown in FIG. 2 is an example, and the configuration is not limited to this. For example, in the configuration example of FIG. 2, the value of K may be changed according to the magnitude of the input signal of the multiplier 205, and when it is large, it moves, and when it is small, it is determined to be noise and operates. . In addition, a feedback-type N that is not the signal from the input terminal 201 but the output signal of the adder 206 as the input signal of the selector 202.
The R configuration may be used.

Next, another embodiment of the present invention will be described in detail with reference to FIG. FIG. 3 is a block diagram showing another embodiment of the present invention. This embodiment is different from the embodiment of FIG. 1 in that
The point is that the frame memory 20 is used and the field delay means for both the luminance progressive scanning process and the color difference progressive scanning process can be operated by the frame memory used in the CNR 16. The operation will be described below with respect to points different from the embodiment of FIG.

In FIG. 3, for example, an A / D (not shown)
A digital MUSE signal is input from the converter via the input terminal 2 and guided to the luminance signal processing means 3.
The luminance signal processing means 3 performs the same processing as that of the embodiment shown in FIG. Here, with respect to the luminance signal, the noise reduction processing causes the blurring to be conspicuous and a large memory capacity is required. Therefore, in the present embodiment, unlike the embodiment of FIG. 1, YNR is not provided. I did it.

Further, the color difference signal processing means 4 performs the same processing as that of the embodiment of FIG. 1 on the color difference signal input from the luminance signal processing means 3. In order to improve the image quality of the color difference signals, a CNR (chroma noise reducer) 16 is provided to reduce noise having no frame correlation, as in the embodiment shown in FIG. Here, as in the embodiment of FIG. 1, the difference between the color difference signal and the signal obtained by delaying the color difference signal by one frame by the frame memory 20 is obtained, and when this difference is small, it is subtracted from the current signal as noise to obtain the color difference. The signal S / N is improved.

On the other hand, for example, an analog NTSC signal is converted into a digital signal by an A / D converter (not shown), and the digital NTSC signal is input from the input terminal 6 and guided to the YC separation processing means 7. The YC separation processing means 7 performs the same processing as in the embodiment of FIG.
In the progressive scanning processing means 8 and 10, the video signals separated into the luminance signal and the color difference signals are subjected to motion adaptive scanning line conversion processing, and converted into non-interlaced signals.
Here, similarly to the embodiment of FIG. 1, interpolation field lines are created by using the data of the previous field for a still image and the data of the average of the previous line and the current line for a moving image. In this embodiment, the frame memory 20 for the CNR 16 is used as the field delay means for the luminance signal and the color difference signal used for the inter-field interpolation applied to the still image.

Therefore, in this embodiment, the input switching means 21 is provided in the preceding stage of the frame memory 20. The input switching means 21 uses the CNR 16 in order to obtain a color difference signal delayed by one frame for use in the CNR 16 processing.
From the color difference signal inputted from the sequential scanning processing means 8 and 10
In order to obtain a luminance signal and a color difference signal delayed by one field for use in the progressive scanning process for a still image in step 1, the luminance signal and the color difference signal input from the sequential scanning processing means 8 and 10 are converted into a MUSE / NTSC switching signal 13 And one of them is input to the frame memory 20. In FIG. 3, the input switching means 21 shows the case where the current TV is selected.

In this case, for example, if the MUSE color difference signal is processed at 16.2 MHz, the memory capacity of one frame is about 4 Mbit.
If the signal is processed at 14 MHz, the memory capacity of one field is about 3 Mbit. Therefore, the frame memory 20 does not have a capacity problem.

As described above, according to this embodiment, the MUS
By performing the noise reduction processing on the color difference signal in the latter stage of the E decoding processing, it is possible to reduce the color noise for all of the motion area processing signal, the still area processing signal, and the low range replacement processing component, and obtain a good image quality. be able to. On the other hand, N
Motion adaptive non-interlace processing can be applied to TSC signal processing, and high image quality can be provided. Further, at this time, the same memory is switched and used for the color noise reduction processing and the non-interlace processing, so that there is no problem of price increase due to increase in memory capacity.

[0040]

According to the present invention, good image quality can be obtained by performing noise reduction processing on a video signal after the decoding processing for HDTV. Also, at this time,
By switching and using the same memory for the noise reduction processing and the non-interlaced processing, there is no problem of price increase due to an increase in memory capacity.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a configuration example of NR and progressive scanning processing means in FIG.

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

FIG. 4 is a block diagram showing a conventional example.

[Explanation of symbols]

 1 ... Decode processing circuit 2 ... MUSE signal input terminal 3 ... Luminance signal processing means 4 ... Color difference signal processing means 5 ... ED processing circuit 6 ... NTSC signal input terminal 7 ... YC separation means 8 ... Sequential scanning processing means 9 ... First field memory 10 ... Sequential scanning processing means 11 ... Second field memory 12 ... Output switching means 13 ... MUSE / NTSC switching signal 14 ... Display 15 ... Luminance noise reducer 16 ... Chroma noise reducer 17 ... First input switching means 18 ... First frame memory 19 ... Second input switching Means 20 ... First frame memory 21 ... Input switching means 201 ... Input terminal 202 ... Selector 203 ... 1 frame / feel Delay means 204 ... Subtractor 205 ... First multiplier 206 ... First adder 207 ... First motion signal 208 ... Output terminal 301 ... Input terminal 302 ... Line memory 303 ... second adder 304 ... second multiplier 305 ... second motion signal 306 ... MIX circuit 307 ... double speed converter 308 ... output terminal

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Noboru Kojima 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa, Ltd. Inside the Hitachi Media Visual Media Laboratory (72) Inventor Masaaki Matsukawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi Image Information Systems Co., Ltd. (72) Inventor Daisuke Honda, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa, Ltd. Information & Video Media Division, Hitachi, Ltd.

Claims (3)

[Claims] 1. Luminance signal processing means for subjecting a luminance signal separated from a high-definition television signal to signal processing in the time direction to convert it into an original broadband luminance signal and outputting the original wideband luminance signal.
Color difference signal processing means for performing signal processing such as time extension on the color difference signal separated from the high definition television signal and outputting the luminance signal, and luminance for separating the current television signal into a luminance signal and a color difference signal and outputting them respectively. The signal / color difference signal separating means and the brightness signal output from the brightness signal / color difference signal separating means,
Luminance sequential scanning processing means for converting an interlaced signal to a non-interlaced signal and outputting the non-interlaced signal;
A color difference sequential scanning processing unit that converts the color difference signal output from the color difference signal separating unit from an interlaced signal to a non-interlaced signal and outputs the non-interlaced signal; A memory for obtaining a delay signal for the luminance signal and / or the color difference signal, which is used when converting to an interlaced signal, a luminance signal output from the luminance signal processing means, and a color difference output from the color difference signal processing means A high-definition television / current television switching signal, and a video signal composed of a signal and a video signal composed of a luminance signal output from the luminance sequential scanning processing means and a color difference signal output from the color difference sequential scanning processing means. Output switching to output either one of the video signals depending on And a luminance noise reducer for performing noise reduction processing on the luminance signal output from the luminance signal processing means, and / or the television signal processing circuit comprising: A chroma noise reducer that performs noise reduction processing on the color difference signals output from the color difference signal processing means is provided at the subsequent stage of the color difference signal processing means, and the luminance signal and / or the luminance signal used when performing noise reduction processing on these noise reducers. Alternatively, the television signal processing circuit is characterized in that a delay signal for a color difference signal is obtained by using the memory. 2. Luminance signal processing means for subjecting a luminance signal separated from a high-definition television signal to signal processing in the time direction to convert it into an original broadband luminance signal and outputting the original broadband luminance signal.
A luminance noise reducer that performs noise reduction processing on the luminance signal output from the luminance signal processing means using frame correlation and outputs the luminance signal, and a color difference signal separated from the high definition television signal, time extension, etc. And a chroma noise reducer for outputting the color difference signal output from the color difference signal processing unit by performing noise reduction processing on the color difference signal output from the color difference signal processing unit by using frame correlation. And a luminance signal output from the luminance signal / color difference signal separating means.
Luminance sequential scanning processing means for converting an interlaced signal to a non-interlaced signal and outputting the non-interlaced signal;
A chrominance progressive scanning processing means for converting the chrominance signal output from the chrominance signal separating means from an interlaced signal to a non-interlaced signal and outputting the chrominance signal, a luminance signal output from the luminance noise reducer, and a chroma noise reducer. A high-definition television / current television is provided with a video signal including a color difference signal and a video signal including a luminance signal output from the luminance sequential scanning processing means and a color difference signal output from the color difference sequential scanning processing means. Output switching means for outputting either one of the video signals by switching in accordance with the brightness switching signal, a luminance signal separately output from the luminance noise reducer, and a luminance signal separately output from the luminance sequential scanning processing means. , Switching according to the high-definition television / current television switching signal The brightness signal output from the first input switching means and the brightness signal output from the first input switching means, and the brightness signal is the brightness signal from the brightness noise reducer. In this case, the input luminance signal is delayed by one frame and is output to the luminance noise reducer as a delay signal for the luminance signal, which is used when performing noise reduction processing in the luminance noise reducer. When the luminance signal is a luminance signal from the luminance progressive scanning processing means, the inputted luminance signal is delayed by one field and the interlaced signal is converted to a non-interlaced signal in the luminance progressive scanning processing means. A first frame that is used as a delay signal for the luminance signal and is output to the luminance sequential scanning processing means A memory, a color difference signal separately output from the chroma noise reducer, and a color difference signal separately output from the color difference sequential scanning processing unit are switched according to the high definition television / current television switching signal, A second input switching means for outputting one of the color difference signals and a color difference signal output from the second input switching means are input, and when the color difference signal is the color difference signal from the chroma noise reducer, The input color difference signal is output to the chroma noise reducer as a delayed signal for the color difference signal, which is used when performing noise reduction processing in the chroma noise reducer by delaying the input color difference signal by one frame. Is a color difference signal from the color difference sequential scanning processing means, the input color difference signal is 1 field. A second frame memory that outputs the color-difference sequential-scanning processing means as a delay signal for the color-difference signal, which is used when the interlaced signal is converted into a non-interlaced signal in the color-difference sequential-scanning processing means, A television signal processing circuit comprising: 3. Luminance signal processing means for subjecting a luminance signal separated from a high-definition television signal to signal processing in the time direction so as to be converted into an original wideband luminance signal for output.
The color difference signal separated from the high definition television signal is subjected to signal processing such as time extension and output, and the color difference signal output from the color difference signal processing means uses frame correlation. Chroma noise reducer for noise reduction processing and output, a luminance signal / color difference signal separating means for separating and outputting the current television signal into a luminance signal and a color difference signal, and output from the luminance signal / color difference signal separating means The luminance signal
Luminance sequential scanning processing means for converting an interlaced signal to a non-interlaced signal and outputting the non-interlaced signal;
The color difference signal output from the color difference signal separating means is converted from an interlaced signal into a non-interlaced signal and output, and a color difference sequential scanning processing means, and a luminance signal output from the luminance signal processing means and the chroma noise reducer. And a video signal including a luminance signal output from the luminance sequential scanning processing means and a color difference signal output from the color difference sequential scanning processing means. An output switching unit that outputs one of the video signals by switching according to a switching signal, a color difference signal that is separately output from the chroma noise reducer, and a luminance signal and / or a luminance signal that is separately output from the luminance sequential scanning processing unit. Alternatively, the color difference signal separately output from the color difference sequential scanning processing unit Television /
Input switching means for switching according to the current television switching signal and outputting either one, and a signal output from the input switching means are input, and when the signal is a color difference signal from the chroma noise reducer, , The input signal is output to the chroma noise reducer as a delayed signal for the color difference signal, which is used when performing noise reduction processing in the chroma noise reducer by delaying the input signal by one frame. In the case of the luminance signal from the luminance progressive scanning processing means and / or the color difference signal from the color difference progressive scanning processing means,
Regarding the luminance signal and / or the color difference signal used for converting the interlaced signal into the non-interlaced signal in the luminance progressive scanning processing means and / or the color difference progressive scanning processing means by delaying the input signal by one field A television signal processing circuit, comprising: a luminance sequential scanning processing means and / or a frame memory for outputting the delayed signal to the color difference progressive scanning processing means.