JPH06165128A - Edt television receiver - Google Patents

Abstract

PURPOSE:To faithfully demodulate the vertical high frequency component of original luminance by executing signal processing for removing a noise component added to a vertical reinforced signal in a transmission system. CONSTITUTION:A dividing part 2 divides signal components, i.e., a vertical reinforced signal VP, a lateral image signal VM and a horizontal reinforced signal HP, included in the upper and lower non-picture areas of a screen. A noise removing part 9 removes a noise component added in the transmission system by the outline storing type or motion adaptive type signal processing of the signal VP to generate a signal VPN from which a noise in a flat part is removed. A vertical reinforced signal decoding part 10 executes prescribed demodulating processing such as the rearrangement of a time sequence and the extension of a time base to reproduce the vertical high frequency components, LD, HD of luminance. Consequently a noise in a still picture part which is visually conspicuous and an offensive noise component interfering with picture quality can be removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to signal processing of a television receiver, and more particularly, it is a letter box EDTV television which is compatible with the current television system and has a wide screen and high definition. The present invention relates to a television receiver suitable for receiving a television signal.

[0002]

2. Description of the Related Art Research and development of an EDTV, which has compatibility with the current television system, has a wider screen and a higher definition, and provides a television image with a more realistic sensation, is under way. Various methods were devised for this EDTV,
One of them is called the letterbox method.

In this letterbox type EDTV,
A wide image having a horizontally long aspect ratio different from the aspect ratio of 4: 3 is transmitted by providing a non-image area on the upper and lower sides of the screen to widen the screen. Also, in order to achieve high definition,
The vertical and horizontal reinforcement signals are suspended in the non-image area and the horizontally long image area at the top and bottom of the screen to improve vertical resolution and horizontal resolution. This television signal has the advantage that it can receive a horizontally long image with a horizontally long aspect ratio even when received by a current receiver, and is therefore attracting attention as a next-generation television system in Japan.

In order to receive a television signal of the letterbox EDTV and receive a high-definition image on the image display portion having a horizontally long aspect ratio, the suspended vertical and horizontal reinforcement signals are used as the original vertical high range signals. Signal processing such as demodulation processing to demodulate components, horizontal high frequency components, and conversion processing of the number of scanning lines for displaying a horizontally long image on the entire screen having a horizontally long aspect ratio is required. Various designs have been made so far regarding a receiver for receiving a television signal of a letterbox EDTV. Related to this is, for example, Japanese Patent Laid-Open Nos. 2-113688 and 3-179.
986, those described in JP-A-3-206788 and the like.

[0005]

[Problems to be Solved by the Invention] Letterbox method E
In most cases, the vertical reinforcement signal of the DTV is hung in a form in which the vertical high-frequency component of luminance is compressed in the time axis, and the receiving side performs time-axis expansion processing to demodulate the original vertical high-frequency component. For this reason, noise, ghosts, etc. added to the vertical reinforcement signal in the transmission system
Level fluctuations and the like are converted into components that are visually conspicuous by the processing of time-axis expansion on the image receiving side, which poses a problem of disturbing image quality.

However, in the conventional receiver, signal processing based on an ideal transmission system is adopted, and consideration is not given to noise, ghost, level fluctuations, etc. added in the transmission system. Therefore, when these components are generated in the transmission system, an unpleasant image quality disturbance due to the occurrence of the components appears on the reproduced image, and it is expected that the reproduced image quality is deteriorated.

An object of the present invention is to solve the above-mentioned expected problems and to always provide a high quality and high definition image quality without being affected by noise, ghost, level fluctuations, etc. added in the transmission system. An object of the present invention is to provide a television receiver that receives a television signal of EDTV.

[0008]

In order to achieve the above object, the present invention provides a noise removing means for efficiently removing noise added to a vertical reinforcement signal. Further, a ghost removing means for efficiently removing the ghost component added to the vertical reinforcement signal is provided. Further, a reference level correction means for removing the DC drift generated by the level fluctuation added to the vertical reinforcement signal is provided. Then, a predetermined vertical demodulation process is performed on the vertical reinforcement signal from which noise, ghost, and level fluctuations added in the transmission system are removed by the above means to reproduce the original vertical high-frequency component, and a horizontal image is demodulated using this. so,
Generates high-quality, high-definition image signal sequences.

[0009]

According to the present invention, in the noise removal, the noise of the flat portion which is visually conspicuous can be efficiently removed by the contour preservation type signal processing. Moreover, the noise of the still image portion, which is visually conspicuous, can be efficiently removed by the motion adaptive type signal processing. Then, of the noise components added to the vertical reinforcement signal, it is possible to remove a noise component that particularly disturbs the image quality.

Further, in the ghost removal, since the ghost component is detected and the signal processing is performed by using the ghost cancellation reference signal, almost ideal ghost removal with less residual ghost can be realized.

Further, in the signal processing of the reference level correction,
Since the DC drift component generated by the level fluctuation is detected from the fluctuation of the pedestal level of the back porch portion of the vertical reinforcement signal to correct the reference level, highly accurate level correction can be realized.

Then, the above noise removal, ghost removal,
By the signal processing of the reference level correction, it is possible to always obtain the vertical reinforcement signal sent by the almost ideal transmission system, and the letterbox type EDTV which receives a high quality and high definition image without image quality interference. A television receiver can be realized.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described by taking a case of a television signal of a letterbox type EDTV in which a vertical reinforcement signal is hung in an upper and lower non-picture area of a screen and a horizontal reinforcement signal is hung in a horizontally long image area. To do.

First, a first embodiment of the present invention will be described with reference to the overall block diagram shown in FIG.

Television signal VS of letterbox EDTV (the number of effective pixel scanning lines in the horizontally long image portion is 360)
This) is sampled by the A / D converter 1 at a frequency four times as high as the color subcarrier fsc, and converted into a digital signal.

The dividing unit 2 separates the vertical reinforcement signal VP in the upper and lower non-image areas of the screen, and the image signal VM of the horizontally long image and the signal components of the horizontal reinforcement signal HP.

The image signal decoder 3 separates the image signal VM into the horizontal reinforcement signal HP. And the horizontal reinforcement signal HP
Reproduces a horizontal high frequency component of luminance by a predetermined demodulation process. On the other hand, the image signal VM is subjected to predetermined processing of luminance / color signal separation and color demodulation to demodulate the luminance and color difference I and Q signals. Then, the horizontal high frequency component of the luminance is added, and the number of effective pixel scanning lines is 360, and the interlace scanning of 2: 1 (hereinafter, 360I).
A luminance signal Y1 and color difference signals I1 and Q1 (abbreviated as system) are generated.

The noise removing section 9 removes the noise component added in the transmission system from the vertical reinforcement signal VP by signal processing of the contour preservation type or the motion adaptive type to generate a noise-removed signal VPN. . Then, the vertical reinforcement signal decoder unit 10 performs predetermined demodulation processing such as time-sequential rearrangement and time-axis extension to reproduce the vertical high-frequency components LD and VH of luminance.

In the progressive scan conversion unit 4, the signals Y1, I1,
Based on Q1 and the vertical high frequency component LD, the signal of the scanning line which is omitted by the interlaced scanning is reproduced, and the signal processing for converting it into the signal of the sequential scanning is performed. Then, the number of effective pixel scanning lines is 48
0 line, 60 frames / sec, 1: 1 sequential scanning (36
A luminance signal Y2 and color difference signals I2 and Q2 of 0P system) are generated.

In the scanning line 3-4 conversion section 5, signals Y2 and I are inputted.
The number of scanning lines is 3 for generating the signals of four scanning lines based on the signals of the three scanning lines 2 and Q2 and the signal of the vertical high frequency component VH.
Perform signal processing for ~ 4 conversion. Then, the luminance signal Y3, the color difference signals I3, Q of the sequential scanning of 480 effective pixel scanning lines, 60 frames / second, 1: 1 (hereinafter abbreviated as 480P system).
3 is generated.

The RGB converter 6 converts the luminance and color differences I and Q into the three primary colors R, G and B by a predetermined matrix operation to generate 480P three-primary color signals R, G and B. .

The D / A converter 7 converts the digital signal into an analog signal and converts the three primary color analog signal series VD.
Generate P. Then, the sequential display unit 8 displays the 480P-system three-primary-color analog signal VDP in the sequential scanning mode having an aspect ratio of 16: 9, 525 scanning lines, 60 frames / sec, and 1: 1.

Next, a second embodiment of the present invention will be described with reference to the overall block diagram shown in FIG. This is suitable when the image display unit is interlaced.

A television signal VS of the letterbox type EDTV (the number of effective pixel scanning lines in the horizontally long image portion is 360)
This) is sampled by the A / D converter 1 at a frequency four times as high as the color subcarrier fsc, and converted into a digital signal. Then, the division unit 2 separates the signal components of the vertical reinforcement signal VP in the upper and lower non-image areas of the screen, the image signal VM of the horizontally long image portion, and the horizontal reinforcement signal HP.

The image signal decoder unit 3 separates the image signal VM and the horizontal reinforcement signal HP from each other. Then, the horizontal reinforcement signal HP reproduces a horizontal high-frequency component of luminance by a predetermined demodulation process. On the other hand, the image signal VM is subjected to predetermined processing of luminance / color signal separation and color demodulation to demodulate the luminance and color difference I and Q signals. Then, the horizontal high-frequency components of the luminance are added to generate a 360I-system luminance signal Y1, color difference signals I1, Q1.

Further, in the noise removing section 9, the vertical reinforcement signal V
The noise component added in the transmission system is removed by contour-preserving type or motion adaptive type signal processing for P, and a noise-free signal VPN is generated. Then, the vertical reinforcement signal decoder unit 10 performs a predetermined demodulation process such as time-series rearrangement and time-axis extension to reproduce the vertical high-frequency component VH of the luminance.

In the scanning line 3-4 conversion section 11, the signals Y1,
3 to 4 of the number of scanning lines that generate signals of four scanning lines based on the signals of three scanning lines I1 and Q1 and the vertical high-frequency component VH.
Performs signal processing for conversion. Then, the number of effective pixel scanning lines is 48
0 line, 30 frames / second, 2: 1 interlace scanning (hereinafter abbreviated as 480I system) luminance signal Y4, color difference signal I
4 and Q4 are generated.

The RGB conversion unit 6 performs conversion processing from the luminance / color difference I, Q system to the three primary color R, G, B systems by a predetermined matrix operation, and performs the 480I system three primary color signals R, G, B.
To generate.

The D / A converter 12 converts the digital signal into an analog signal to generate a three-primary-color analog signal series VDI. Then, in the interlaced display unit 13, for example, the aspect ratio is 16: 9 and the scanning mode is NTS.
The 480I system three-primary-color analog signal VDI is displayed by the interlace scanning of 525 scanning lines, 30 frames / sec, and 2: 1 which is the same as the C television system.

Next, each block portion in these embodiments will be described.

First, an embodiment of the image signal decoder section 3 will be described with reference to FIG. This is because the horizontal reinforcement signal HP has the time frequency f, as shown in FIG.
It is suitable for a signal suspended in the first and third quadrants, which is conjugate with the color signal C in the f-ν region of the vertical frequency ν.

The separation unit 14 separates the horizontal reinforcement signal HP shown by the shaded portion in FIG. 9B and the image signal VM by the three-dimensional filter of horizontal / vertical / time. Then, in the horizontal reinforcement signal decoder unit 15, the subcarrier μ ₀ (1
The demodulation process of the synchronous detection by 6 fsc / 7) is performed to reproduce the horizontal high frequency component YH (4.2 MHz or more) of the luminance. On the other hand, the image signal VM is separated by the YC separation unit 16 into a luminance component and a color component according to two-dimensional (horizontal / vertical) or motion adaptive three-dimensional (horizontal / vertical / time) characteristics.
The luminance signal VL and the color signal C are extracted. Then, the luminance signal YL is adjusted by the delay unit 17 for the time delay associated with the signal processing, and the addition unit 18 adds the horizontal high frequency component YH to obtain 36.
The 0I system luminance signal Y1 is generated. In addition, the color demodulation unit 19
Then, the color signal C is synchronously detected by the subcarrier fsc, and the color difference I,
The Q signal is demodulated and the color difference signals I1 and Q1 of the 360I system are obtained.
To generate.

Next, an embodiment of the progressive scan conversion 4 will be described with reference to FIG.
Will be described. FIG. 3A shows an outline of this signal processing. For the luminance low-frequency signal (for example, a component of 1 MHz or less), the conversion matrix 1 is calculated by the signals of the scanning line X of 360 I system and the vertical high-frequency component LD, and 3
The signals of the scanning lines A and B of the 60P system are generated. On the other hand, for the luminance high band and the color difference signal, the conversion matrix 2 is calculated by the signals of the scanning lines X1 and X2 of the 360I system, and 36
The signals of the 0P scanning lines A and B are generated.

FIG. 3B shows an example of the structure for realizing this signal processing. The color difference signals I1 and Q1 of the 360I system and the signal SYH obtained by extracting the high-luminance component of 1 MHz or more by the HPF unit 20 are subjected to the calculation processing by the conversion matrix 2 in the calculation unit 22 and are applied to the scanning lines A and B of the 360P system. Corresponding signal I
Generate A, QA, YHA, and IB, QB, YHB. Further, the signal SYL in which the LPF unit 21 extracts the luminance low-frequency component of 1 MHz or less and the vertical high-frequency component LD are subjected to the arithmetic processing by the conversion matrix 1 in the arithmetic unit 3 and correspond to the scanning lines A and B of the 360P system. The generated signals YLA and YLB are generated. Then, the addition unit 24 adds the two signals together, and outputs the signal YA corresponding to the 360P scanning lines A and B of the luminance signal.
And YB. These signals are written in the memory unit 25 by a WT operation in which one scanning line period of interlaced scanning is a cycle. On the other hand, the RD operation for one scanning line period of the sequential scanning performs an operation of alternately reading out the signals corresponding to the scanning lines A and B from the memory section to generate a 360P-system luminance signal Y2 and color difference signals I2 and Q2.

Next, an embodiment of the scanning line 3-4 conversion section 5 will be described with reference to FIG.

FIG. 3A shows an outline of this signal processing. For the luminance low band signal, the conversion matrix 3 is calculated by the signals of the 360P scanning lines X, Y, Z and the vertical high band component VH, and the 480P scanning lines A, B,
The C and D signals are generated. On the other hand, for the high luminance and color difference signals, the conversion matrix 4 is calculated by the signals of the scanning lines X, Y, Z, X of the 360P system, and the scanning line A of the 480P system,
B, C, and D signals are generated. The coefficient value of the conversion matrix 3 is given by the inverse determinant of the conversion matrix used for converting the scanning lines 4 to 3 on the image transmitting side.

FIG. 3B shows an example of the structure for realizing this signal processing. Signals Y2, I2, Q2 of the 360P system are transmitted to the memory unit 26 in a cycle of one frame period of sequential scanning.
Scanning lines X, Y, Z, ...
Write the signal of. Then, in the RD operation in which one frame period of progressive scanning is a cycle, the scanning line X,
The signals of Y, Z, X, X, Y, Z, ... Are read. Then, the HPF unit 27 extracts the high luminance component and the LPF 28 extracts the low luminance component. The arithmetic unit 29 performs arithmetic processing by the conversion matrix 4 to generate 480P-based color difference signals I3, Q3 and a luminance high frequency signal YSH. In addition, the calculation unit 30 performs a calculation process using the conversion matrix 3 using the vertical high frequency component VH to generate a 480P-based luminance low frequency signal YSL. Then, the addition unit 31 adds the both signals to generate a 480P-system luminance signal Y3.

Next, the signal processing in the scanning line 3-4 conversion section 11 used in the second embodiment will be described with reference to FIG.

As shown in FIG. 4A, the 480I scanning lines A, B, and 480I scanning lines are based on signals of the 360I scanning lines X, Y, and Z.
The C and D signals are generated to realize the 3-4 conversion of the scanning lines.

FIG. 11B shows an example of a conversion matrix for a luminance low band signal, and FIG. 9C shows an example of a conversion matrix for a luminance high band signal and a color difference signal. It should be noted that in the 3-4 conversion of scanning lines in interlaced scanning, 4
In order for the 80I system signal to satisfy the 2: 1 interlaced scanning relationship, conversion matrices having different coefficient values are used during the first field period and the second field period.
A signal of the 80I scanning line is generated.

Since this signal processing can be realized with the same configuration as that shown in FIG. 5B, the description thereof will be omitted.

Next, an embodiment of the noise removing section 9 will be described with reference to FIG. This is suitable for removing noise components in contour-preserving type signal processing.

The outline of this signal processing is shown in FIG.
Noise added in the transmission system is suspended in the input signal VP. The 1-clock differential signal DF, which is the difference between this signal and the signal delayed by 1 clock, includes a noise component and a contour portion. This signal DF is subjected to isolated point removal processing to generate a contour area signal CT. Then, the contour area signal C
In the region where T is L, the addition signal NC is generated by a signal obtained by inverting the polarity of the 1-clock differential signal DF and in the contour region where CT is H by a signal of zero. And this signal is input signal V
Add to P to remove noise component. Then, the output signal VPN from which the noise in the flat portion is removed is generated.

FIG. 9B shows an example of the configuration for realizing this signal processing. Input signal VP and 1-clock delay unit 3
The signal delayed by 1 clock in 2 is input to the difference detection unit 33, and the 1-clock difference signal DF is generated by performing an arithmetic process for calculating the difference between the two signals. The contour detection unit 34 detects a contour region by signal processing such as binary quantization, isolated point removal, and smoothing, and generates a contour region signal CT of H in the contour region and L in the other regions. Then, the polarity reversing unit 35
Then, when the contour region signal CT is L, a signal obtained by inverting the polarity of the signal DF is output, and when the signal CT is H, a zero signal is output to generate the addition signal NC. Then, the addition unit 37
Then, the signal V is obtained by adding the signal NC to the signal VP whose time delay is adjusted by the delay unit 36 and removing the noise component in the flat portion region.
Generate PN.

FIG. 8 is a diagram showing another embodiment of the noise removing unit 9, which is suitable for removing noise in the still image portion by motion adaptive type signal processing.

FIG. 6A shows an example of this structure. Signal V
The signal delayed by P and the one-frame delay unit 38 for one frame period is input to the difference unit 39, and the one-frame difference signal FD is extracted by performing a calculation process for calculating the difference between the two signals. The motion detector 40 detects motion information by signal processing such as binary quantization, isolated point removal, and smoothing, and the coefficient value changes according to the size of the motion as shown in FIG. Generate a motion coefficient k. The vertical reinforcement signal is NT
Unlike the SC television signal, since it is a component type signal, it is possible to detect motion by the components of the entire band of the differential signal between one frames. Therefore, the motion can be detected with high accuracy.

On the other hand, the polarity reversing section 41 generates a signal FDC in which the polarity of the one-frame difference signal FD is reversed.
Then, the coefficient adding unit 42 generates a signal k · FDC by weighting this signal with the motion coefficient k. And the addition unit 3
In 7, the signal k · FDC is added to the signal VP whose time delay is adjusted by the delay unit 43 to generate the signal VPN from which the noise component of the still image portion is removed.

Next, an embodiment of the vertical reinforcement signal decoder section 10 will be described with reference to FIG.

FIG. 6A shows an example of this structure. The demultiplexing unit 44 distributes the signal components corresponding to the vertical high-frequency component LD and VH, which are multiplexed in the form of time division multiplexing to the signal VPN, respectively. And the memory circuit 4
5 and 46, the WT operation and R shown in FIG.
Signals are written and read by the D operation to generate time-sequentially rearranged signals SLD and SVH. The sample point insertion unit 47 extends the time axis and inserts a zero value into a sample point having no sample value to generate a signal sequence of the original sampling structure. Then, the interpolation filter unit 48 extracts a signal component in a predetermined band and reproduces the vertical high frequency components LD and VH of the luminance.

The A / D conversion section 1, the division section 2, the RGB
Each block of the conversion unit 6 and the D / A conversion units 7 and 12 can be easily realized by the conventional technique, and thus the description thereof will be omitted.

As described above, according to this embodiment, there is little image quality interference due to noise added in the transmission system, and high quality,
A television receiver of a letterbox EDTV capable of receiving a high-definition image can be realized.

Next, a third embodiment of the present invention will be described with reference to FIG.
It will be described with reference to the overall block diagram shown in FIG.

Television signal VS of letterbox EDTV (360 effective pixel scanning lines in landscape image area)
Is sampled by the A / D converter 1 at a frequency four times as high as the color subcarrier fsc, and converted into a digital signal.

The ghost removing section 49 performs signal processing for ghost removal using the ghost cancellation reference signal, and removes ghost components and waveform distortion components added in the transmission system.

The dividing unit 2 separates the vertical reinforcement signal VP in the upper and lower non-image areas of the screen and the image components VM of the horizontally long image and the horizontal reinforcement signal HP.

The image signal decoder unit 3 separates the image signal VM and the horizontal reinforcement signal HP from each other. Then, the horizontal reinforcement signal HP reproduces the horizontal high frequency component of the luminance by a predetermined demodulation process. Further, the image signal VM is demodulated into luminance and color difference I and Q signals by signal processing of luminance / color signal separation and color demodulation. Then, the horizontal high-frequency component of the luminance is added to generate a 360I-system luminance signal Y1 and color difference signals I1 and Q1.

The noise removing unit 9 removes noise from the vertical reinforcement signal VP by signal processing of contour preservation type or motion adaptive type to generate a signal VPN from which noise added in the transmission system is removed. Then, the vertical reinforcement signal decoder unit 10 performs predetermined demodulation processing such as time-sequential rearrangement and time-axis extension to reproduce the vertical high-frequency components LD and VH of luminance.

In the progressive scan conversion unit 4, the signals Y1, I1, and
Signal processing is performed to generate a signal of a scanning line missing in interlaced scanning based on Q1 and the vertical high-frequency component LD and convert the signal into a progressive scanning signal, and a 360P luminance signal Y2, color difference signals I2, Q2 are obtained. To generate.

In the scanning line 3 to 4 conversion section 5, the number of scanning lines is 3 to 4 for generating signals of 4 scanning lines based on signals of 3 scanning lines of 360P system and vertical high frequency component VH. The signal processing of conversion is performed, and the luminance signal Y3 of the 480P system, the color difference signal I3,
Generate Q3.

The RGB conversion section 6 performs conversion processing from the luminance / color difference I, Q system to the three primary colors R, G, B by a predetermined matrix operation, and performs the 480P three-primary color signals R, G ,.
Generate B.

The D / A converter 7 converts the digital signal into an analog signal to generate a 480P system three primary color analog signal series VDP. In the sequential display unit 8, for example, the aspect ratio is 16: 9, the scanning operation speed is 525, which is twice the number of scanning lines of the NTSC television system,
It is displayed in the form of 1: 1 progressive scanning at 60 frames / sec.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
It will be described with reference to the overall block diagram shown in FIG.

Television signal VS of letterbox type EDTV (360 effective pixel scanning lines in landscape image area)
Is sampled by the A / D converter 1 at a frequency four times as high as the color subcarrier f _sc and converted into a digital signal.

The ghost removing section 49 performs signal processing for ghost removal using the ghost cancellation reference signal, and removes ghost components and waveform distortion components added in the transmission system.

The division unit 2 separates the vertical reinforcement signal VP in the upper and lower non-image areas of the screen, and the image signal VM of the horizontally long image from the horizontal reinforcement signal HP.

The image signal decoder section 3 separates the image signal VM and the horizontal reinforcement signal HP from each other. Then, the horizontal reinforcement signal HP reproduces the horizontal high frequency component of the luminance by a predetermined demodulation process. Further, the image signal VM demodulates the signals of the luminance / color difference I and Q by signal processing of luminance / color signal separation and color demodulation.
Then, the horizontal high frequency components of the luminance are added to generate a luminance signal Y1 and color difference signals I1 and Q1 of 360I.

On the other hand, the DC drift removing section 50 detects the DC drift component due to the level fluctuation from the pedestal level of the back porch portion of the vertical reinforcement signal VP and performs the signal processing for correcting the reference level, thereby performing the DC drift component. Generate a vertical augmentation signal without

The noise removing unit 9 removes noise by contour preserving type or motion adaptive type signal processing to generate a signal VPN from which noise added in the transmission system is removed.
Then, the vertical reinforcement signal decoder unit 10 performs predetermined demodulation processing such as time-sequential rearrangement and time-axis extension to reproduce the vertical high-frequency components LD and VH of luminance.

In the progressive scan conversion unit 4, a scan conversion signal is generated based on the 360I system signal and the vertical high frequency component LD to generate a scan line signal that has been skipped by interlaced scanning and convert it into a progressive scan signal. Processing, and the brightness signal Y of 360P system
2. Color difference signals I2 and Q2 are generated.

In the scanning line 3 to 4 converter 5, the number of scanning lines is 3 to 4 which generates signals of 4 scanning lines based on signals of 3 scanning lines of 360P system and vertical high frequency component VH. The signal processing of conversion is performed, and the luminance signal Y3 of the 480P system, the color difference signal I3,
Generate Q3.

The RGB conversion section 6 performs conversion processing from the luminance / color difference I, Q system into the three primary colors R, G, B by a predetermined matrix operation, and performs the 480P three-primary color signals R, G ,.
Generate B.

The D / A converter 7 converts the digital signal into an analog signal to generate a 480P system three primary color analog signal series VDP. In the sequential display unit 8, for example, the aspect ratio is 16: 9, the scanning operation speed is 525, which is twice the number of scanning lines of the NTSC television system,
It is displayed in the form of 1: 1 progressive scanning at 60 frames / sec.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
It will be described with reference to the overall block diagram shown in FIG.

Television signal VS of letterbox EDTV (360 effective pixel scanning lines in landscape image area)
Is sampled by the A / D converter 1 at a frequency four times as high as the color subcarrier f _sc and converted into a digital signal.

The ghost removing section 49 performs signal processing for ghost removal using the ghost cancellation reference signal, and removes ghost components and waveform distortion components added in the transmission system.

The dividing section 2 separates the vertical reinforcement signal VP in the upper and lower non-image areas of the screen, and the image signal VM of the horizontally long image from the horizontal reinforcement signal HP.

The image signal decoder unit 3 separates the image signal VM and the horizontal reinforcement signal HP into a horizontal reinforcement signal HP.
Reproduces a horizontal high frequency component of luminance by a predetermined demodulation process. On the other hand, the image signal VM is subjected to predetermined processing of luminance / color signal separation and color demodulation to demodulate the luminance / color difference I and Q signals.
Then, the horizontal high frequency components of the luminance are added to generate a luminance signal Y1 and color difference signals I1 and Q1 of 360I.

The noise removing unit 9 removes noise from the vertical reinforcement signal VP by contour preservation type or motion adaptive type signal processing to generate a signal VPN from which noise added in the transmission system is removed. Then, the vertical reinforcement signal decoder unit 10 performs a predetermined demodulation process such as time-sequential rearrangement and time-axis extension to reproduce the vertical high-frequency component VH of luminance.

In the scanning line 3-4 conversion section 11, scanning line 3-4 conversion is performed to generate signals for the four scanning lines based on the signals of the 360I system three scanning lines and the vertical high frequency component VH. Signal processing of 480I system luminance signal Y4, color difference signal I4,
Generate Q4.

The RGB conversion unit 6 performs conversion processing from the luminance / color difference I, Q system to the three primary colors R, G, B by a predetermined matrix operation, and performs the 480I three primary color signals R, G, B.
To generate.

The D / A converter 12 converts the digital signal into an analog signal and generates a 480I system three primary color analog signal sequence VDI. In the interlaced display unit 13, for example, the aspect ratio is 16: 9, the scanning mode is the same as the NTSC television system, and the number of scanning lines is 525.
It is displayed in the form of 2: 1 interlace scanning at 30 frames / sec.

Next, a sixth embodiment of the present invention will be described with reference to FIG.
It will be described with reference to the overall block diagram shown in FIG.

Television signal VS of letterbox type EDTV (360 effective pixel scanning lines in landscape image part)
Is sampled by the A / D converter 1 at a frequency four times as high as the color subcarrier f _sc and converted into a digital signal.

The ghost removing section 49 performs signal processing for ghost removal using the ghost canceling reference signal, and removes ghost components and waveform distortion components added in the transmission system.

The division section 2 separates the vertical reinforcement signal VP in the upper and lower non-image areas of the screen, and the image signal VM of the horizontally long image from the horizontal reinforcement signal HP.

The image signal decoder unit 3 separates the image signal VM and the horizontal reinforcement signal HP into a horizontal reinforcement signal HP.
Reproduces a horizontal high-frequency component of luminance by a predetermined demodulation process. On the other hand, the image signal VM performs signal processing of luminance / color signal separation and color demodulation, and demodulates signals of luminance / color difference I and Q. Then, the horizontal high-frequency component of the luminance is added to generate a 360I-system luminance signal Y1 and color difference signals I1 and Q1.

On the other hand, the DC drift removing section 50 performs signal processing for detecting a DC drift component due to level fluctuation from the pedestal level of the vertical reinforcement signal VP, for example, the pedestal level of the back porch section, and correcting the reference level, thereby performing the DC drift component. Generate a vertical augmentation signal without

The noise removing unit 9 performs noise removal by contour-preserving type or motion adaptive type signal processing, and generates a signal VPN from which noise added in the transmission system is removed.
Then, the vertical reinforcement signal decoder unit 10 performs a predetermined demodulation process such as time-sequential rearrangement and time-axis extension to reproduce the vertical high-frequency component VH of luminance.

In the scanning line 3-4 conversion section 11, the scanning lines 3 to 3 which generate the signals of the four scanning lines based on the signals of the three scanning lines of the 360I system and the signal of the vertical high frequency component VH. The signal processing of four conversions is performed to generate a luminance signal Y4 of the 480I system, color difference signals I4 and Q4.

The RGB conversion section 6 performs conversion processing from the luminance / color difference I, Q system to the three primary colors R, G, B by a predetermined matrix calculation, and performs the 480I three primary color signals R, G,
Generate B.

The D / A converter 12 converts the digital signal into an analog signal to generate a 480I system three primary color analog signal series VDI. In the interlaced display unit 13, for example, the aspect ratio is 16: 9, the scanning form is the same as that of the NTSC television system, and the number of scanning lines is 525.
This is displayed in the form of book, 30 frames / second, 2: 1 interlaced scanning.

As described above, according to this embodiment, a letterbox type EDTV that receives a high-quality and high-definition image with little image interference due to noise, ghost, and level fluctuations added in the transmission system. A television receiver can be realized.

In the description of the embodiment, the case of the television signal of the letterbox system EDTV in which the vertical reinforcement signal is superimposed on the upper and lower non-picture areas of the screen and the horizontal reinforcement signal is superimposed on the horizontally long picture area is described as an example. Obviously, the present invention can be applied to a television signal of a letterbox type EDTV of another form.

Further, in the present invention, the system identification of the NTSC television system and the letterbox system EDTV is performed by detecting the presence or absence of the identification signal of the received television signal.

[0095]

According to the present invention, since the signal processing for removing components such as noise, ghost, and level fluctuation added to the vertical reinforcement signal in the transmission system is performed, the vertical high frequency component of the original luminance can be faithfully demodulated. . Therefore, it is possible to realize a letterbox EDTV television receiver that receives a high-quality and high-definition image without causing annoying image quality deterioration due to noise, ghost, and level fluctuations added in the transmission system.

[Brief description of drawings]

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

FIG. 2 is an overall block configuration diagram of a second embodiment of the present invention.

FIG. 3 is a diagram showing an embodiment of an image signal decoder block.

FIG. 4 is a diagram illustrating an example of a progressive scan conversion unit block.

FIG. 5 is a diagram showing an example of a scanning line 3-4 conversion block.

FIG. 6 is an explanatory diagram of signal processing of an interlaced scanning line 3-4 conversion unit.

FIG. 7 is a diagram showing an embodiment of a noise removing unit block.

FIG. 8 is a diagram showing another embodiment of the noise removing unit block.

FIG. 9 is a diagram showing an embodiment of a vertical reinforcement signal decoder block.

FIG. 10 is an overall block configuration diagram of a third embodiment of the present invention.

FIG. 11 is an overall block configuration diagram of a fourth embodiment of the present invention.

FIG. 12 is an overall block configuration diagram of a fifth embodiment of the present invention.

FIG. 13 is an overall block configuration diagram of a sixth embodiment of the present invention.

[Explanation of symbols]

1 ... A / D converter, 2 ... Divider, 3 ... Image signal decoder, 4 ... Sequential scan converter, 5 ... Scan line 3-4 converter, 6
... RGB conversion section, 7 ... D / A conversion section, 8 ... Sequential display section,
9 ... Noise removal section, 10 ... Vertical reinforcement signal decoder section, 11
... scanning line 3 to 4 converter, 12 ... D / A converter, 13 ... interlace display, 14 ... separator, 15 ... horizontal reinforcing signal decoder, 16 ... YC separator, 17 ... delay, 18 ...
Addition unit, 19 ... Color demodulation unit, 20 ... HPF unit, 21 ... LP
F part, 22, 23 ... Calculation part, 24 ... Addition part, 25, 26
... memory section, 27 ... HPF section, 28 ... LPF section, 29,
30 ... Arithmetic unit, 31 ... Addition unit, 32 ... 1 clock delay unit, 33 ... Difference detection unit, 34 ... Contour detection unit, 35 ... Polarity inversion unit, 36 ... Delay unit, 37 ... Addition unit, 38 ... 1 frame delay Part, 39 ... difference part, 40 ... motion detecting part, 41 ... polarity reversing part, 42 ... coefficient weighting part, 43 ... delaying part, 44 ... demultiplexing part, 45, 46 ... memory part, 47 ... sample point inserting part , 48 ... Interpolation filter section, 49 ... Ghost removing section, 50 ... DC drift removing section.

Claims (6)

[Claims] 1. A television receiver for receiving a television signal of a letterbox EDTV for transmitting a horizontally long image having a horizontally long aspect ratio different from 4: 3 by providing non-image areas on the top and bottom of the screen. In the machine, a means for performing noise-removing signal processing for removing a noise component is provided for the vertical reinforcement signals in the non-image area above and below the screen, and the vertical reinforcement signal generated by the means is demodulated to obtain a vertical An EDT that reproduces an image signal sequence by signal processing of demodulating a horizontally long image having a horizontally long aspect ratio using a high frequency component, and displays the image signal on an image display unit having a horizontally long aspect ratio.
V television receiver. 2. The image display unit having a horizontally long aspect ratio according to claim 1, wherein the aspect ratio is 16: 9, the scanning operation speed is twice that of the NTSC television system, and the number of scanning lines is 52.
An EDTV television receiver characterized in that it is constructed in the form of 5 lines, 60 frames / sec, and 1: 1 progressive scanning. 3. The image display unit having a horizontally long aspect ratio according to claim 1, wherein the aspect ratio is 16: 9, and the scanning is NTS.
An EDTV television receiver characterized in that it is configured in the form of interlaced scanning of 2: 1 with 525 scanning lines, 30 frames / second, which is the same as the C television system. 4. A ghost-removing signal processing means for removing a ghost component according to a ghost-cancellation reference signal of a television signal of a letterbox EDTV, according to any one of claims 1, 2 and 3. EDT
V television receiver. 5. A reference level correction signal processing means for removing a component of level variation from a vertical reinforcement signal of a television signal of a letterbox EDTV to generate a vertical reinforcement signal without DC drift. An EDTV television receiver according to any one of claims 1, 2, 3, and 4. 6. An NTSC television system or a letterbox system EDT depending on the presence or absence of a television signal identification signal.
The EDTV television receiver according to any one of claims 1, 2, 3, 4, and 5, further comprising means for performing V format identification.