JPH09172619A - Wide television signal processing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the image quality without a sense of incongruity with respect to a motion by selecting a time frequency band of a luminance signal and an HH signal the same even when a pre-combing control signal is set or cleared at a transmitter side of the 2nd generation EDTV system. SOLUTION: This processing unit has a pre-filter section including an LPF 101 extracting a vertical lower frequency component of a luminance signal, an LPF 102 extracting a still image component, LPFs 103, 104 extracting an HH signal, an adder 105 adding an output signal of the LPF 102 and the HH signal, and a mixer 106 applying mixing to the output signals of the IPF 101 and the adder 106 based on a motion detection signal of a motion detector 107. Then the processing unit has a mode where the LPF 102, 103 are changed to a narrow band and a broad band and a mode where a parameter setting value of the motion detector 107 is changed toward motion or still state based on a pre-combing control signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a high image quality and a high aspect ratio as compared with the current television while maintaining compatibility with the current television broadcasting within the transmission band used in the current television broadcasting. The present invention relates to a second generation EDTV system wide television signal processing device capable of transmitting an image having a large ratio.

[0002]

2. Description of the Related Art Current color television broadcasting is based on the NTSC system in Japan and the United States as 525 scanning lines, 2:
1 interlace scanning, luminance signal horizontal bandwidth 4.2 MHz, aspect ratio 4: 3 specifications (for example, refer to: Broadcasting Technology Sosho Color Television, edited by Japan Broadcasting Corporation, Japan Broadcasting Corporation, 1961) I am doing it, but Showa 3
More than 30 years have passed since it was launched in five years. In the meantime, various new television systems have been proposed in accordance with the demand for high-definition screens and the improvement in the performance of television receivers. In addition, the contents of the programs to be serviced are changing from simple studio programs and relay programs to programs with higher image quality and more realistic images, such as cinema-sized movie broadcasts.

Against this background, a wide television signal broadcasting system has been proposed which is compatible with the current broadcasting and has a wide screen. So-called second generation EDT
This is known as the V method, and the number of effective scanning lines is compressed from 480 to 360 per frame, and black portions (hereinafter referred to as non-image portions) are left and right above and below. By doing so, the aspect ratio becomes 16: 9, but the vertical resolution drops, so it is necessary to transmit the components from 360 lph to 480 lph as vertical high frequency components (hereinafter referred to as VH signals) especially in the case of still images. There is. Usually, this VH signal is transmitted in the upper and lower non-picture parts. Furthermore, as a signal source:
When using a progressive scan of 1, 2: 1
A so-called vertical time high frequency component (hereinafter, referred to as a VT signal) generated when converting to interlaced scanning is transmitted. This VT signal is also transmitted by the upper and lower non-picture parts. In addition, the current horizontal resolution of 4.2 MHz is expanded in order to increase the horizontal resolution, and the higher band is transmitted as a horizontal high-frequency component (hereinafter referred to as HH signal), which is multiplexed within the screen especially in the case of a still image. To do.

A wide television signal has 525 horizontal scanning lines.
In the book, the horizontal frequency band of the 1: 1 sequential scanning and luminance signal is about 6 MHz. The number of effective scanning lines is 480.
It is a book. On the other hand, a normal television signal conventionally used has a horizontal scanning line number of 525, a 2: 1 interlaced scanning, and a luminance signal horizontal frequency band of about 4.2 MHz. It is mainly used in current NTSC television broadcasting. Second-generation EDT that transmits wide TV signals while maintaining compatibility with current NTSC TV broadcasting
In the V system, in order to maintain compatibility with the transmission path, it is necessary to perform signal processing for converting a wide television signal into a signal of 525 scanning lines, 2: 1 interlaced scanning, and a luminance signal horizontal frequency band of 4.2 MHz. The signal generated by this conversion process is VH
Signals, VT signals, and HH signals, of which the signals recommended to be adaptively transmitted by the motion detection signal are the VH signal and the HH signal.

FIG. 6 shows a block diagram of an example of an encoder compatible with the second generation EDTV system. Number of horizontal scanning lines 52
5 (480 effective scanning lines) and aspect ratio 16:
The luminance signal output from the progressive scanning wide television signal source 300 of 9 is input to the pre-filter 600 and the non-interlaced motion detector 601. The pre-filter 600 suppresses line flicker interference when a wide television signal is received by the current receiver, and limits the band of the luminance signal so that the HH signal is not transmitted during a moving image. Therefore,
Normally, the output signal of the pre-filter 600 is the motion detector 60.
The band is limited by one motion detection signal. The output signal of the pre-filter 600 is a 4-3 conversion vertical high pass filter (high pass filter, hereinafter referred to as HPF) 311 and a 4-3 conversion vertical low pass filter (low pass filter,
(Hereinafter referred to as LPF) 312. The 4-3 conversion vertical LPF 312 limits the vertical frequency to about 360 lph or less to prevent aliasing and converts the number of effective scanning lines from 480 to 360. When such a process is applied to the main image portion, the vertical resolution is reduced from 480 lph to about 360 lph, and the amount corresponding to about 360 lph to 480 lph is lost. Since this component is the VH signal, which is particularly effective for a still image, it is usually taken out separately and transmitted. In the path of the VH signal, first, the 4-3 conversion vertical HPF3
At 11, the 4-3 conversion or the low frequency shift is performed to convert the vertical high frequency component (a component from about 360 lph to 480 lph) of the luminance signal into the vertical low frequency range from 0 to 120 lph, and the 15 Hz modulation is performed. By doing so, both the VT signal and the VH signal can be multiplexed in the upper and lower non-image areas. In addition,
Interlaced converter (hereinafter referred to as P-I converter) 315
Is input to the VH signal, and the VH signal is converted from progressive scanning to interlaced scanning, and 180 scanning lines are thinned out from 360 scanning lines and extracted. Then, it is input to the multiplier 602. Since the VH signal which is a vertical high frequency component is visually effective for a still image, the multiplier 602 controls the gain of the VH signal by the motion detection signal of the interlace motion detector 603. The output signal of the multiplier 602 is the horizontal LPF 604.
, The horizontal band is limited to about 1 MHz.

Next, the output signal of the 4-3 conversion vertical LPF 312 converted into 360 lines is the SSKF vertical HPF 313.
Is input to the SSKF vertical LPF 314. The SSKF filter is a kind of separation / synthesis filter capable of completely restoring a progressive scanning signal which is an input signal of an encoder by a decoder, and is a Symmetric Short Kerne filter.
Abbreviation for l Filter. In the signal path forming the main image portion, first, the vertical low-frequency component is extracted by the SSKF vertical LPF 314. The P-I converter 317 thins out 180 scanning lines from 360 scanning lines and outputs the thinned lines, thereby generating a luminance signal of the main image portion.

Next, in the signal path of the VT signal, which is a signal in which the component lost when converted by the P-I converter 317 is extracted, first, the SSKF vertical HPF 313 generates a VT signal having a vertical time high-frequency component. It Further, the P-I converter 316 thins out 180 scanning lines from 360 scanning lines and outputs the thinned lines. Then, the horizontal LPF 605 limits the horizontal band to about 1 MHz.

The output of the horizontal LPF 605, which is the VT signal for 180 lines per field, and the output of the horizontal LPF 604, which is the VH signal for 180 lines per field, generated in this way are added in the vertical arrangement processing section 321. Then, the time axis is further compressed to ⅓, and is then combined with the luminance signal of the main image section which is the output of the P-I converter 317.
That is, during the 180 lines of the main picture portion, the P-I converter 3
The output signals of 17 are output as both the VH signal and the VT signal, which are compressed to 1/3 in the upper and lower non-image parts. The output signal of the vertical arrangement processing unit 321 is input to the horizontal high frequency component multiplexing unit 322, and the HH signal is multiplexed.

As described in Japanese Patent Publication No. 1-7555, an HH signal is frequency-multiplexed and transmitted at a conjugate frequency position in a time-vertical frequency region in which a color subcarrier is modulated and arranged with a color difference signal. . The output signal of the horizontal high frequency component multiplexing unit 322 is input to the NTSC encoder 325. On the other hand, the color signal output from the wide television signal source 300 is 4-
The number of scanning lines is 4 as in the case of the luminance signal by the 3-conversion vertical LPF 323.
After being converted from 80 to 360, the P-I converter 32
In 4, the scanning lines are thinned out from 360 scanning lines to 180 scanning lines and input to the NTSC encoder 325. The luminance signal and the color difference signals are combined and output as an NTSC signal.
The output signal of the NTSC encoder 325 is input to the interference reduction processing unit 326, and is subjected to interference reduction processing that makes the VH signal and the VT signal multiplexed in the upper and lower non-picture portions visually less visible as interference.

[0010]

In the conventional configuration, the HH
It is desirable to preliminarily limit the bands of the HH signal, the luminance signal, and the chrominance signal on the transmission side, that is, precombing, so that crosstalk between the signal and the luminance signal or the chrominance signal does not occur. Of these, in order to prevent crosstalk between the luminance signal and the HH signal, the horizontal frequency is about 2.2 to 4.2 MH.
Since it is necessary to remove the vertical time high-frequency component of the luminance signal of z so as not to be transmitted, a filter with several taps is necessary in both the vertical and time directions. However, in particular, when a filter with several taps in the time direction is used, there are problems that the delay of the video signal becomes large and that it is difficult to realize because of the signal processing that extends over several fields. Furthermore, the time frequency band of the luminance signal and the horizontal frequency are about 4.2 only if the vertical frequency high-frequency component of the luminance signal having a horizontal frequency of about 2.2 to 4.2 MHz is deleted so as not to be transmitted.
There is a problem in that there is a difference in the time frequency band of the HH signal of ˜6 MHz, and the image quality is uncomfortable with movement.

The present invention solves the above-mentioned conventional problems, and while maintaining compatibility with current television broadcasting,
From the luminance signal to the HH of the crosstalk that occurs when precombing processing is performed when the signal is received by the current receiver or wide television receiver, that is, when the HH signal is multiplexed.
It is an object of the present invention to reduce crosstalk to a signal with a small circuit scale, remove a sense of discomfort in image quality due to a difference between a time frequency band of a luminance signal and a time frequency band of an HH signal, and transmit a wide television signal.

[0012]

To achieve this object, in the wide television signal processing apparatus of the present invention, the horizontal frequency of the luminance signal of the wide television signal source is approximately 2.2.
A 3-tap first time LPF for band-controlling a 4.2 MHz luminance signal in the time direction, and the horizontal frequency is about 2.2.
A first vertical LPF that band-limits a luminance signal of 4.2 MHz in the vertical direction, and a 3-tap that band-limits a luminance signal whose horizontal frequency of a wide television signal source is approximately 4.2 to 6 MHz in the time and vertical directions. The second time LPF and the second vertical LPF, the output signal of the first time LPF and the horizontal frequency band-limited in the time and vertical directions are about 4.2 to 6M.
An adder for adding a luminance signal of Hz, a motion detector for outputting a motion detection signal from the luminance signal of the wide television signal source, a gain of the output signal of the first vertical LPF, and an output signal of the adder. The circuit includes a mixer configured to add and control a gain by a motion detection signal which is an output signal of the motion detector, and the output signal of the mixer is 4-3.
It has a configuration in which it is input to the conversion LPF to generate the luminance signal of the main picture portion, and while maintaining compatibility with the current television broadcasting, when it is received by the current receiver or wide television receiver, When performing precombing processing, that is, in the crosstalk that occurs when the HH signals are multiplexed, the crosstalk from the luminance signal to the HH signal is reduced with a small circuit scale, and the time frequency band of the luminance signal and the time of the HH signal are reduced. Wide television signals can be transmitted by eliminating the sense of incongruity in image quality due to the difference in frequency band.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a 3-tap for band-limiting the luminance signal of the luminance signal of the wide television signal source whose horizontal frequency is about 2.2 to 4.2 MHz in the time direction. The first time LPF, the first vertical LPF for band limiting the luminance signal having the horizontal frequency of about 2.2 to 4.2 MHz in the vertical direction, and the horizontal frequency of the wide television signal source is about 4.2. A 3-tap second time LPF and a second vertical LPF that band-limit the luminance signal of 6 MHz in the time and vertical directions, an output signal of the first time LPF, and a horizontal frequency that is band-limited in the time and vertical directions. Is about 4.
An adder that adds a luminance signal of 2 to 6 MHz, a motion detector that outputs a motion detection signal from a luminance signal of the wide television signal source, a gain of an output signal of the first vertical LPF, and an output of the adder There is provided a circuit composed of a mixer for controlling the gain of the signal by the motion detection signal which is the output signal of the motion detector and adding the same, and the output signal of the mixer is inputted to the 4-3 conversion LPF to be supplied to the main image section. A wide television signal processing device having a configuration for generating a luminance signal, wherein when the HH signal is multiplexed by performing precombing with a precombing control signal,
The frequency band of the second time LPF has a narrow band characteristic, and the horizontal frequency at which the HH signal is multiplexed is approximately 2.2 to 4.
For the band of 2 MHz, the center of the conjugate frequency position in the time-vertical frequency domain in which the HH signal is frequency-multiplexed, that is, (time frequency f, vertical frequency ν) = (± 15 Hz, ± 180 lph)
, The luminance signal is always 0 dB, and crosstalk from the luminance signal to the HH signal can be reduced. Circuit is 3
Since it is composed of a tap time filter and a mixer controlled by a motion detection signal, it is relatively small in that there is no need to use a 5-tap or 7-tap time filter, and the delay of the video signal by this circuit is about It is as small as 1 field (1/60 second).

According to a second aspect of the present invention, the frequency bands of the first time LPF and the second time LPF are switched by the precombing control signal, and a narrow band characteristic is provided when precombing is performed. The wide television signal processing device according to claim 1, wherein when the pre-combing is not performed, the wide television signal processing device is controlled so as to have a wide band characteristic.
By controlling the frequency bands of the first and second time LPFs to have a wide band characteristic by the precombing control signal, the horizontal frequency is about 2.2 to 4.2 MHz with or without precombing. Since the still image component of the luminance signal and the time frequency band of the HH signal are the same, it is possible to obtain an image quality that is not uncomfortable with the movement.

According to a third aspect of the present invention, the parameter setting values of the motion detector are switched according to the precombing control signal, and when precombing is performed, a characteristic of a motion close is provided, and when precombing is not performed. Is a wide television signal processing apparatus according to claim 1, wherein the wide television signal processing apparatus is controlled so as to have a characteristic close to a still state.
When pre-combing is performed by the pre-combing control signal and HH signals are multiplexed, the parameter setting value of the motion detector is set so that the characteristic closer to the motion is obtained, and when the pre-combing is not performed, the characteristic closer to the static is obtained. Control so that the still image component of the luminance signal having a horizontal frequency of about 2.2 to 4.2 MHz and the time frequency band of the HH signal become the same regardless of the precombing, so that there is a sense of discomfort to the motion. No image quality is obtained.

The invention according to claim 4 of the present invention is the second time L of 3 taps for band-limiting the luminance signal of the wide television signal source whose horizontal frequency is about 4.2 to 6 MHz in the time direction.
2. The wide television signal processing device according to claim 1, wherein the PF is arranged in front of or behind the second vertical LPF.

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 shows a luminance signal to HH of a wide television signal processing apparatus according to Embodiment 1 of the present invention.
FIG. 6 shows a block diagram of a circuit that prevents crosstalk to signals. In order to prevent crosstalk from the luminance signal to the HH signal, it is necessary to remove the luminance signal existing at the position where the HH signal is frequency-multiplexed in advance by signal processing.
At this time, it is desirable to prevent the crosstalk from the luminance signal to the HH signal as accurately as possible and to minimize the delay of the video signal, that is, the circuit configuration in which the tap number of the time filter is minimum. As described above, the HH signal is frequency-multiplexed at the conjugate frequency position in the time-vertical frequency domain in which the color subcarrier is modulated and arranged with the color difference signal. The horizontal frequency region in which the HH signal is frequency-multiplexed is located at a position of about 2.2 to 4.2 MHz. For this reason, a signal having a horizontal frequency of a luminance signal of a wide television signal source of about 2.2 to 4.2 MHz is represented by, for example, (1 + Z ^−1050H ) / 2, and a first time L of 3 taps is shown.
Time LPF 102 as a PF and a first vertical LP having a characteristic of -6 dB at 90 lph with 180 lph as a zero point
Input to the vertical LPF 101 as F.

The 3-tap time LPF 102 is a filter having a characteristic of -6 dB at 10 Hz with 15 Hz as a zero point.
The low-frequency component of the time that is a still image component is extracted, and the vertical L
PF101 is 90 lph with 180 lph as the zero point-
The vertical low-frequency component of the luminance signal is extracted by the filter having the characteristic of 6 dB. Furthermore, the horizontal frequency is about 2.2.
It is necessary to eliminate the discomfort in the image quality due to the difference between the time frequency band of the 4.2 MHz luminance signal and the time frequency band of the HH signal. Therefore, even for a luminance signal with a horizontal frequency of 4.2 to 6 MHz of a wide television signal source, for example, a 3-tap second time LP shown by (1 + Z ^−1050H ) / 2
Bandwidth limitation is performed by a time LPF 103 as F and a vertical LPF 104 as a second vertical LPF having a characteristic of -6 dB at 180 lph with 360 lph as a zero point, and H
Extract the H signal. At this time, the time LPF 103 is vertical L
It may be provided before or after the PF 104. Time LP
The output signal of F102 and the luminance signal of which the horizontal frequency band-limited in the time and vertical directions is about 4.2 to 6.2 MHz are input to the adder 105 and added. Output signal of adder 105 (Ss) and output signal of vertical LPF 101 (Sm)
Is input to the mixer 106. In the mixer 106, the motion of the non-interlaced motion detector 107 in which the luminance signal of the wide television signal source is controlled by the precombing control signal, as indicated by {k · Sm + (8−k) · Ss} / 8, is used. The detection signals k (0 ≦ k ≦ 8) control the gains of the signals Ss and Sm, and the gains are added.

The output signal of the mixer 106 is input to the 4-3 conversion vertical LPF, and is processed to generate the luminance signal of the main picture portion.

FIG. 4 shows the time of the output signal of the mixer 106--
It is a figure for demonstrating a vertical frequency band. 4A, 4B, and 4C show the characteristics of the vertical LPF 101, the characteristics of the 3-tap time LPFs 102 and 103, and the band of the output signal of the mixer 106, respectively, with the horizontal axis representing the time frequency and the vertical axis representing the vertical axis. Indicates the vertical frequency. When the luminance signal of the wide television signal source is a complete still image, that is, the motion detection signal k =
In the case of 0, the vertical line portion of FIG. 4C, that is, (f,
A signal in the band of ν) = (0 to 10 Hz, 0 to 360 lph) is output from the mixer 106. As shown in FIG. 4B, the output signals of the 3-tap time LPFs 102 and 103 are not only still image components of 10 Hz or less, but also 20 to 3
It contains a folding component of 0 Hz. However, the signal component of 20 to 30 Hz is not extracted by the motion detection signal based on the difference of 1 field (1/60 second) in the mixer 106, and the output signal of the mixer 106 is a still image component of 10 Hz or less. At this time, the center of the conjugate frequency position in the time-vertical frequency domain where the HH signals are frequency-multiplexed, that is, the signal of (f, ν) = (± 15 Hz, ± 180 lph) becomes 0 dB. When the luminance signal of the wide television signal source is a complete moving image, that is, when the motion detection signal k = 8, the horizontal line portion of (c) of FIG. 4, that is, (f, ν) = (0 to 3)
The signal in the band of 0 Hz, 0 to 90 lph) is mixed by the mixer 10.
It is output from 6. Also at this time (f, ν) = (± 15H
The signal of z, ± 180 lph) is 0 dB. Even when the motion detection signal k is 1 to 7, {k · Sm + (8−k) · S
As is clear from s} / 8, (f, ν) = (± 15H
The signal of z, ± 180 lph) is 0 dB. Therefore, the center of the conjugate frequency position in the time-vertical frequency domain where the HH signal is frequency-multiplexed, that is, (f, ν) = (±
The signal of 15 Hz, ± 180 lph) is always 0 dB, and the crosstalk from the luminance signal to the HH signal can be reduced. Also, the horizontal frequency is about 2.2 to 4.2.
Time frequency band and HH of still image component of MHz luminance signal
Since the time-frequency bands of the signals are the same at 10 Hz, an image quality that does not give a sense of discomfort to motion can be obtained.

Next, when precombing is not performed, the time of the luminance signal having a horizontal frequency of about 2.2 to 4.2 MHz-
It is not necessary to limit the vertical frequency band as shown in FIG. 4, but only the band limitation for suppressing line flicker interference when a wide television signal is received by the current receiver is sufficient. Therefore, for example, (1 + 2 · Z ^-525H +
Z- ^1050H ) / 4 time tap of 3 taps LPF
A vertical LPF 10 applied to F102 and 103 and having a characteristic of −6 dB at 180 lph with 360 lph as a zero point
1,104 may be used. FIG. 5 is a diagram for explaining the time-vertical frequency band of the output signal of the mixer 106 when precombing is not performed. 5 (a), (b), and (c) are the same as in FIG.
The characteristics of the vertical LPFs 101 and 104 having a characteristic of −6 dB at 180 lph with lph as a zero point, (1 + 2 · Z
^-525H + Z ^-1050H ) / 4, characteristics of 3-tap time LPFs 102 and 103 to which the filter shown in FIG.
Of the output signal, the horizontal axis represents the time frequency, and the vertical axis represents the vertical frequency. At this time, (f, ν) = (± 15H
The signal component at the position of z, ± 180 lph) is -6 dB. In this case as well, the still image component of the luminance signal having a horizontal frequency of about 2.2 to 4.2 MHz and the time frequency band of the HH signal are both the same at 15 Hz, so that an image quality that is not uncomfortable with motion can be obtained.

Further, the mixer 106 can be operated without switching the frequency characteristic of the time LPF by the precombing control signal.
Motion detector 107 which outputs a motion detection signal input to
When the HH signal is multiplexed by performing precombing by switching the parameter setting values of,
In the case where precombing is not performed, the same effect can be obtained by controlling so as to have a static-side characteristic. At this time, for the time LPFs 102 and 103, for example, a filter represented by (1 + 2 · Z ^−525H + Z ^−1050H ) / 4 may be used.

Next, FIG. 3 is a block diagram of an encoder having the circuit block of the present invention shown in FIG. 1 in a pre-filter section. 525 horizontal scanning lines (480 effective scanning lines)
In this case, the wide-screen television signal source 300 for progressive scanning with the aspect ratio of 16: 9 outputs the luminance signal Y and the color difference signals I, Q or RY, BY. Wide TV signal source 300
The output luminance signal of is the pre-filter unit 301 and the motion detector 1
07. The motion detector 107 performs motion detection for each pixel by a 1-field (1/60 second) difference or a combination of a 1-field difference and a 2-field (1/30 second) difference, and a scene change detection signal and a motion detection signal. Is output.

First, the pre-filter unit 301 is a horizontal LPF.
302, 303, 304 and subtractors 307, 308, 30
9, a vertical time filter unit 310, a vertical HPF 305, and a multiplier 306. The luminance signal of the wide television signal source 300 input to the pre-filter unit 301 is horizontal L
PFs 302, 303, 304 and subtractors 307, 308,
309, the horizontal frequency component is 1MHz or less, 1
-2.2 MHz component, 2.2-4.2 MHz component,
It is divided into components of 4.2 MHz or higher. Horizontal LPF30
The component having a horizontal frequency of 1 MHz or less, which is the output signal of 2, is divided into two systems. One is processed by the vertical HPF 305 and the multiplier 306 and input to the 4-3 conversion vertical HPF 311. Like the encoder of FIG. 6 showing the conventional example, the second generation EDTV processing for extracting the VH signal is performed. . The other is input to the 4-3 conversion vertical LPF 312. The 4-3 conversion vertical LPF 312 limits the vertical frequency to about 360 lph or less to prevent aliasing and converts the number of effective scanning lines from 480 to 360. The output signal of the 4-3 conversion vertical LPF 312 is the SSKF vertical HPF 313.
Is input to the SSKF vertical LPF 314. The output signal of the SSKF vertical LPF 314 is input to the P-I converter 317 and then to the adder 320. SSKF vertical H
Similar to the encoder shown in FIG. 6, the output signal of the PF 313 is subjected to the second generation EDTV processing for multiplexing the VT signal.

(Embodiment 2) Next, the vertical frequency filter unit 31 is a component whose horizontal frequency is 1 to 2.2 MHz, a component whose horizontal frequency is 2.2 to 4.2 MHz, and a component whose frequency is 4.2 MHz or more.
Input to 0. FIG. 2 shows a block diagram when the circuit of the present invention shown in FIG. 1 is applied to the vertical time filter unit 310. The vertical time filter unit 310 includes the time LPFs 102, 1
03, 200, vertical LPFs 101, 104, 201, adders 105, 202, and a mixer 106.
In the vertical time filter unit 310, the time and vertical frequency band of the luminance signal having a horizontal frequency of about 1 to 6 MHz are limited by the motion detection signal of the motion detector 107, and the HH signal having a horizontal frequency of about 4.2 to 6 MHz. The gain of is controlled. Among these, the signal processing of the luminance signal having a horizontal frequency of approximately 2.2 to 4.2 MHz, which is the output signal of the subtractor 308, and the luminance signal having the horizontal frequency of approximately 4.2 to 6 MHz, which is the output signal of the subtractor 309. Figure 1 shows the signal processing of
As described in the above. The luminance signal having a horizontal frequency of about 1 to 2.2 MHz, which is the output signal of the subtractor 307, is time LP.
It is input to the F200 and the vertical LPF 201. Time LPF
In 200, for example, a filter represented by (1 + 2 · Z ^−525H + Z ^−1050H ) / 4 is applied to extract a still image component. The vertical LPF 201 applies a filter having a characteristic of −6 dB at 180 lph, for example, and extracts a vertical low frequency component of 180 lph or less. The adder 202 adds the output signal of the vertical LPF 101 and the output signal of the vertical LPF 201, and has a horizontal frequency of about 1 to 4.2 MHz and a vertical frequency of 180 lph.
The following moving image component signals are output. The adder 105 adds the output signal of the time LPF 200, the output signal of the time LPF 102, and the output signal of the vertical LPF 104, and outputs a still image component and a HH signal component having a horizontal frequency of about 1 to 4.2 MHz. Output signal (Ss) of adder 105 and adder 202
The output signal (Sm) is input to the mixer 106. In the mixer 106, {k · Sm + (8−k) · Ss} / 8
As shown by, the gain of each signal is controlled by the motion detection signal k (0 ≦ k ≦ 8) output from the motion detector 107, and the gain is added.

The output signal of the mixer 106, that is, the output signal of the vertical time filter unit 310 is a 4-3 conversion vertical L signal.
It is input to the PF 318. 4-3 conversion vertical LPF318
In order to prevent aliasing, the vertical frequency is limited to approximately 360 lph or less, and the number of effective scanning lines is converted from 480 to 360. The output signal of the 4-3 conversion vertical LPF 318 is P-I.
It is input to the converter 319, and the output signal of the P-I converter 319 is input to the adder 320. In the adder 320, the component of which the horizontal frequency of the luminance signal is 1 MHz or less and the component of 1 MHz or more are added and output as the luminance signal of the main image portion.
The output signal of the adder 320 is the second-generation EDTV as the luminance signal of the main image section, as in the encoder of FIG. 6 showing the conventional example.
Processing is done.

[0027]

As is clear from the above description, in the so-called second generation EDTV wide television signal processing apparatus that widens the screen while maintaining compatibility with the current television broadcasting system, the HH signal is For the band of the horizontal frequency of about 2.2 to 4.2 MHz, the center of the conjugate frequency position of the time-vertical frequency domain where the HH signal is frequency-multiplexed, that is, (( The luminance signal of f, ν) = (± 15 Hz, ± 180 lph) is always 0 dB, and the crosstalk from the luminance signal to the HH signal can be reduced. The circuit is relatively small, and the delay of the video signal by this circuit is as small as about 1 field (1/60 second). Furthermore, the horizontal frequency is approximately 2.2 to 4.2 depending on the precombing control signal.
The frequency characteristics of the time LPF for extracting the still image component of the luminance signal of MHz and the time LPF for extracting the HH signal are switched to the same. With this configuration, the horizontal frequency is about 2.2 to 4.2 MHz with or without precombing.
Since the still image component of the luminance signal and the time frequency band of the HH signal are the same, it is possible to obtain an image quality that is not uncomfortable with movement.

Alternatively, the horizontal frequency is about 2.2 to 4.2.
The frequency characteristics of the time LPF for extracting the still image component of the luminance signal of MHz and the time LPF for outputting the HH signal are fixed, and when precombing the parameter setting value of the motion detector by the precombing control signal, it moves closer to the movement. , When not performing pre-combing, switch to the stationary side. Even with this configuration, the time frequency band of the HH signal is the same as the still image component of the luminance signal having a horizontal frequency of about 2.2 to 4.2 MHz regardless of whether precombing is performed. Image quality without discomfort can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a wide television signal processing device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a wide television signal processing device according to another embodiment of the present invention.

FIG. 3 is a block diagram of an encoder incorporating the wide television signal processing device of the present invention.

4 is an explanatory diagram showing a time-vertical frequency band of an output signal of the mixer 106 in FIG. 1 when performing precombing.

5 is an explanatory diagram showing the time-vertical frequency band of the output signal of the mixer 106 of FIG. 1 when precombing is not performed.

FIG. 6 is a block diagram of an encoder incorporating a conventional wide television signal processing device.

[Explanation of symbols]

101, 104, 201 Vertical LPF 102, 103, 200 time LPF 105, 202, 320 Adder 106 Mixer 107, 601 Non-interlaced motion detector 300 Wide television signal source 301 Pre-filter unit 302, 303, 304, 604 605 Horizontal LPF 305 Vertical HPF 306,602 Multiplier 307, 308, 309 Subtractor 310 Vertical time filter unit 311 4-3 conversion vertical HPF 312, 318, 323 4-3 conversion vertical LPF 313 SSKF vertical HPF 314 SSKF vertical LPF 315 , 316, 317, 319, 324 P-I converter 321 Vertical arrangement processing unit 322 Horizontal high-frequency component multiplexing unit 325 NTSC encoder 326 Interference reduction processing unit 600 Pre-filter 603 Motion detector for interlace

Claims (4)

[Claims] 1. A second-generation EDTV system transmitter for transmitting a wide television signal having an aspect ratio of 16: 9 while being compatible with a television signal having an aspect ratio of 4: 3. The frequency is about 2.2-4.
A 3-tap first temporal low-pass filter for band-limiting the 2 MHz luminance signal in the time direction, and a first vertical low-pass filter for vertically limiting the luminance signal having a horizontal frequency of about 2.2 to 4.2 MHz. A 3-tap second temporal low-pass filter and a second vertical low-pass filter for band-limiting the luminance signal having a horizontal frequency of about 4.2 to 6 MHz of the wide television signal source in the time and vertical directions; The output signal of the temporal low-pass filter and the horizontal frequency band-limited in the temporal and vertical directions are about 4.2 to 6 MHz.
Of the luminance signal of the wide television signal source, a motion detector that outputs a motion detection signal from the luminance signal of the wide television signal source, a gain of the output signal of the first vertical low-pass filter, and an output signal of the adder. The circuit has a circuit composed of a mixer for controlling gain by a motion detection signal which is an output signal of the motion detector and adding the same. The output signal of the mixer is input to a 4-3 conversion low-pass filter and A wide television signal processing device that generates a luminance signal. 2. The precombing control signal allows the first
The frequency bands of the time low-pass filter and the second time low-pass filter are switched, and control is performed so that narrow band characteristics are provided when precombing is performed and wideband characteristics are provided when precombing is not performed. The wide television signal processing apparatus according to claim 1. 3. A precombing control signal is used to switch the parameter setting values of the motion detector so that the precombing has a characteristic closer to the movement, and the precombing does not have a characteristic closer to the stationary. The wide television signal processing apparatus according to claim 1, wherein: 4. A 3-tap second time low-pass filter for limiting the band of a luminance signal having a horizontal frequency of about 4.2-6 MHz of a wide television signal source in the time direction is provided either before or after the second vertical low-pass filter. The wide television signal processing device according to claim 1, wherein the wide television signal processing device is disposed on one side.