JPH06178272A - Image transmission reception system for television signal - Google Patents

Abstract

PURPOSE:To reduce time delay and a memory capacity by superimposing a lower part pattern vertical reinforcement signal to an upper part of a pattern and an upper pattern vertical reinforcement signal to a lower part of a pattern of a preceding field respectively. CONSTITUTION:A main signal encoder section 5 superimposes a chrominance signal onto a luminance signal to generate a picture signal VM for a laterally long picture section (main section). A vertical reinforcement signal encoder section 6 implements time axis compression and time division multiplex for luminance vertical high frequency components YVH, YLD to generate a vertical reinforcement signal VH superimposed on a non-pattern area (mask part) above/under the pattern. Then a multiplex section 7 superimposes the signal VH onto the signal VM and a process section 8 adds a synchronizing signal and a burst signal or the like and a D/A converter section 9 converts the signal into an analog signal to generate a letter box system EDTV television signal VS. In this signal VS, the lower pattern vertical reinforcement signal VHD corresponding to the lower part of the pattern of a laterally long picture is arranged to the upper mask part and the upper pattern vertical reinforcement signal VHU corresponding to the lower part of the pattern of a laterally long picture is arranged to the lower mask part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television signal transmission / reception system and apparatus, and in particular, a letter box for achieving wide screen, high image quality and high accuracy while maintaining compatibility with current televisions. The present invention relates to a television signal transmission / reception system suitable for EDTV.

[0002]

2. Description of the Related Art Research and development of a television signal transmission / reception system for achieving high image quality, high definition, and widening of a television image and providing a more realistic and high quality image service have been advanced. There is.

Among them, the EDTV has compatibility with the current television and aims to widen the screen, increase the definition, and improve the image quality, and many methods have been devised to realize this. Among them, the so-called letterbox method is for transmitting a horizontally long image having a horizontally long aspect ratio by providing a non-image area on the upper and lower sides of the screen. This system is characterized in that it can receive wide images even with the current receiver, and is being developed as a promising system for realizing EDTV.

In this letterbox EDTV, the vertical resolution of the image and the vertical reinforcement signal for improving the horizontal resolution are provided in the non-image area and the horizontally long image area above and below the screen.
Higher definition is achieved by superimposing the horizontal reinforcement signal. And regarding these overlapping reinforcement signals,
For example, those described in JP-A-2-107081, JP-A-2-113688, JP-A-3-1799686, and JP-A-3-187692 can be cited.

[0005]

SUMMARY OF THE INVENTION In the above prior art,
In many cases, a vertical reinforcement signal is superimposed on the non-picture area above and below the screen to form a television signal.
However, the component of the vertical reinforcement signal in which region of the landscape image is
No consideration is given to the position of the upper and lower non-image areas. For this reason, in the image receiving section, there are problems such as a large time delay and a large capacity memory required for image reproduction using the vertical reinforcement signal, and the cost of the image receiving apparatus becomes expensive. Become.

An object of the present invention is a letter-box EDTV television signal in which the signal processing in the image receiving section is simple, the time delay is small, the required memory capacity is small, and the cost of the image receiving apparatus can be reduced. Is to provide an image transmission / reception system.

[0007]

According to the present invention, in order to achieve the above object, a lower screen vertical reinforcement signal corresponding to a lower screen of a horizontally long image is made to correspond to a non-image area of the upper screen and an upper screen of a horizontally long image. The upper screen vertical reinforcement signal is superimposed on the non-picture area of the lower part of the screen in the previous field to form a television signal of the letterbox EDTV.

The horizontal reinforcement signal is superimposed on the area of the horizontally long image to form a letterbox EDTV television signal.

[0009]

In the television signal according to the present invention, the upper screen vertical reinforcement signal (the non-picture area in the lower part of the screen in the previous field) and the lower screen vertical reinforcement signal (the non-picture area in the upper part of the screen in the current field) are chronologically arranged. ), The image signal of the horizontally long image (horizontally long image portion area of the current field) is formed in this order.

Therefore, since the image receiving unit can receive all the information of the vertical reinforcement signal required at the head position of the horizontally long image portion area, demodulation processing using the vertical reinforcement signal is possible from the head position of this horizontally long image portion area. become. For this reason, processing such as delaying the image signal in the horizontally long image portion area becomes unnecessary, and signal processing with less time delay can be realized. Further, since a memory for signal delay is not necessary, it is possible to reduce the memory capacity.

Further, in the present invention, since the horizontal reinforcement signal is superimposed on the horizontally long image portion area, the memory required for reproducing the horizontal reinforcement signal is also provided as compared with the case where the horizontal reinforcement signal is superimposed on the upper and lower non-picture area portions of the screen. It can be reduced.

Therefore, it is possible to realize an image transmitting / receiving apparatus capable of reducing the cost of the image receiving section and making it economical.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the image sending unit according to the present invention will be described with reference to the overall block diagram shown in FIG. This is suitable when the imaging system is progressive scanning.

In the progressive scanning image pickup unit 1, for example, the aspect ratio is 16: 9, the number of scanning lines is 525, 60 frames, 1:
Image signal series VPS of three primary color signals in the form of one progressive scan
To generate. Then, in the A / D converter 2, the current NTSC
The color subcarrier fsc of the television signal is sampled at, for example, eight times the frequency, and converted into a digitized image signal sequence VPD.

Sequentially, in the 4 to 3 converter 3, the number of scanning lines is 4
.About.3 conversion processing is performed, and a progressive scan image signal series VP having 360 effective pixel scanning lines corresponding to a letterbox horizontal image and a vertical high frequency component YVH of a luminance signal lost in the 4 to 3 conversion processing. To generate.

The interlace conversion unit 4 sequentially performs scan conversion processing from scanning to interlaced scanning, and the current NT
The image signal series VI of 30 frames and 2: 1 interlaced scanning similar to the SC television signal, and the vertical high frequency component YLD of the luminance lost by this scan conversion processing are generated.

In the main signal encoder section 5, the current NT
The color signal is superimposed on the luminance signal by the same encoding process as the SC television signal to generate the image signal VM of the horizontally long image portion (hereinafter abbreviated as the main portion).

In the vertical reinforcement signal encoder unit 6, the vertical high frequency components YVH and YLD of luminance are subjected to time axis compression, time division multiplexing, time series conversion, etc. (Abbreviated as)) vertical reinforcement signal V
Generate H.

The multiplexing unit 7 superimposes the signal VH on the signal VM, and the processing unit 8 superimposes a predetermined synchronization signal, burst signal,
An identification signal or the like is added, and the D / A converter 9 converts the signal into an analog signal to generate a letterbox EDTV television signal VS. In this signal VS, a lower screen vertical reinforcement signal VHD corresponding to the lower screen portion of the horizontally long image is arranged in the upper mask portion, and an upper screen vertical reinforcement signal VHU corresponding to the upper screen portion is arranged in the lower mask portion.

FIG. 2 shows the form of the signal VS in time series. A set of signals VHU, VHD, VM, eg
The signals of the area shown by the dots in the figure constitute the image signal for one field. Therefore, an image for one field is transmitted by the signal VHU of the lower mask part of the previous field, the signal VHD of the upper mask part of the current field, and the signal VM of the main part of the current field.

FIG. 3 is an overall block diagram of the image receiving section of the first embodiment.

The letterbox EDTV television signal VS is sampled by the A / D converter 10 at, for example, four times the frequency of the color subcarrier fsc and converted into a digital signal VSD.

In the main signal decoder section 11, the current NTS
Demodulation processing (luminance / color signal separation, color demodulation) similar to that of C television signals is performed, and the number of effective pixel scanning lines is 360: 2:
The image signal series VI of the interlaced scanning of 1 is demodulated.
Further, the vertical reinforcement signal decoder unit 12 performs a predetermined demodulation process (time series conversion, on the vertical reinforcement signal VH of the mask unit).
(Time axis extension) is performed to obtain vertical high-frequency components YVH and YL of luminance.
Demodulate D.

The sequential conversion unit 13 performs a scan conversion process of interlaced to progressive scanning using the vertical high-frequency component YLD of luminance, and 60 frames with 360 effective pixel scanning lines,
An image signal series VP of 1: 1 progressive scanning is generated.

The 3-4 conversion unit 14 sequentially performs 3-4 conversion processing of the number of scanning lines using the vertical high frequency component YVH of luminance, and 60 frames of 480 effective pixel scanning lines, 1:
The image signal series VPD of the progressive scanning of 1 is generated.

The D / A converter 15 converts the analog image signal series VPS. Then, the progressive scan display unit 16 displays an image having 480 effective pixel scanning lines in the form of sequential scanning with an aspect ratio of 16: 9, 525 scanning lines, 60 frames, and 1: 1.

FIG. 4 is a diagram showing a comparison between the present invention and the prior art regarding the signal processing in the image receiving section.

In the present invention, as shown in FIG. 3A, the vertical reinforcement signals VHU and V required for demodulating the signal VM of the main part.
Since HD has received all at the beginning position of the signal VM,
From this leading position, signal processing of progressive scanning conversion and sequential 3-4 conversion can be performed. On the other hand, in the conventional technique, as shown in FIG. 2B, the vertical reinforcement signal VHD is not yet received when the signal VM of the main part is received. Therefore, as shown in the figure, the signal VM is delayed to perform signal processing of progressive scan conversion and sequential 3 to 4 conversion. Therefore, there are problems such as the need for a memory for delay and a large amount of time delay. According to the present invention, since these problems can be solved, it is possible to reduce the cost and the economy of the receiver.

The configuration of each block in the embodiment will be collectively described later.

Next, a second embodiment of the present invention will be described. This is suitable for further superimposing the horizontal reinforcement signal on the main area.

This image sending unit will be described with reference to the entire block diagram shown in FIG.

In the progressive scanning image pickup unit 1, for example, the aspect ratio is 16: 9, the number of scanning lines is 525, 60 frames, 1:
Image signal series VPS of three primary color signals in the form of one progressive scan
To generate. The A / D converter 2 performs sampling at a frequency that is eight times the color subcarrier fsc of the current NTSC television signal and converts it into a digitized image signal sequence VPD.

In the 4-3 conversion unit 3, the number of scanning lines is changed from 4 to 3.
3 conversion processing is performed to generate a progressive scanning image signal series VP having 360 effective pixel scanning lines, and a vertical high frequency component YVH of the luminance signal lost in the 4 to 3 conversion processing.

The interlace conversion unit 4 performs scan conversion processing from progressive scanning to interlaced scanning, and the current NTS
30 frames in the same scanning mode as C television signals,
Image signal series VI of 2: 1 interlaced scanning, and vertical high-frequency component Y of luminance lost in this scan conversion processing
Generate LD.

In the main signal encoder section 5, the current NT
Performs the same encoding processing as SC television signals,
An image signal VM of the main part area in a form in which a color signal is superimposed on a luminance signal is generated.

The vertical reinforcement signal encoder unit 6 performs processing such as time base compression of the vertical high frequency components YVH and YLD of the luminance, time series conversion, time division multiplexing, and the like, and the vertical reinforcement signal VH (upper part) to be superimposed on the mask portion region. The mask portion area generates a lower screen vertical reinforcing signal VHD, and the lower mask portion area generates an upper screen vertical reinforcing signal VHU.

Further, the horizontal reinforcement signal encoder unit 17 shifts the horizontal high frequency component VH (4.2 MHz or more) of luminance to the 2 to 4 MHz band by frequency shift to generate the horizontal reinforcement signal HH to be superimposed on the main region. To do.

In the multiplexing section 7, signals VH and HH are added to the signal VM.
Are superimposed, and a predetermined synchronizing signal, burst signal, identification signal, etc. are added in the process unit 8. Then, the D / A converter 9
Converted to analog signal with and letterbox EDTV
The television signal VS is generated.

FIG. 6 shows the multiplexing form of the horizontal reinforcement signal HH. The same figure (a) is the one-dimensional signal spectrum. The signal VM of the main area is the luminance signal Y
The color signal C quadrature amplitude modulated by the color subcarrier fsc is multiplexed on L. Then, the horizontal reinforcement signal HH obtained by shifting the high frequency component YH of the luminance signal to the frequency band of 2 to 4 MHz by the frequency shift operation is further multiplexed on the signal VM. The figure (b) is
The signal spectrum in the time-vertical two-dimensional frequency domain of time frequency f and vertical frequency v is shown. The color signal C is the second
The horizontal reinforcement signal HH exists in the fifth quadrant, and exists in the first and third quadrants (hereinafter abbreviated as Fukinuki Hole) which are conjugate with the horizontal reinforcement signal HH.

FIG. 7 is an overall block diagram of the image receiving section. Letterbox EDTV television signal VS
Is sampled by the A / D converter 10 at a frequency four times as high as the color subcarrier fsc, and converted into a digitized signal VSD.

In the main signal decoder section 11, the current NT
Demodulation processing similar to that of SC television signals, that is, luminance / color signal separation and color demodulation is performed. Then, a horizontal high-frequency component Y of luminance based on the horizontal reinforcement signal HH is generated by the horizontal reinforcement signal 18.
The demodulated signal is added to H, and demodulated to an image signal series VI of interlace scanning with 360 effective pixel scanning lines in the main area and 2: 1.

The vertical reinforcement signal decoder unit 12 performs a predetermined demodulation process on the vertical reinforcement signal VH in the mask region, that is, time series conversion, time axis extension, etc., and the vertical high frequency component YVH of the original luminance. , YLD is demodulated.

In the sequential conversion unit 13, the vertical high frequency component Y of the luminance is obtained.
Scan conversion processing from interlace to progressive scan using LD is performed to obtain 360 effective pixel scanning lines, 60 frames,
An image signal series VP of 1: 1 progressive scanning is generated. In addition, the vertical 3-4 conversion unit 14 sequentially applies the vertical high-frequency component Y of the luminance.
A scanning line number 3 to 4 conversion process using VH is performed to generate a progressive scanning image signal sequence VPD with 480 effective pixel scanning lines, 60 frames, and 1: 1.

The image signal series VPS converted into an analog signal in the D / A converter 15 is sequentially scanned and displayed in the progressive scan display unit 16 with an aspect ratio of 16: 9, 525 scanning lines, 60 frames, and 1: 1. It is displayed in the form and the image is reproduced.

According to the present embodiment, it is possible to provide a device that transmits and receives a high quality and high definition image having a wide aspect ratio, and that realizes cost reduction and economic efficiency of the image receiving portion.

Next, a third embodiment of the present invention will be described with reference to FIGS. This is suitable when the imaging system is an interlaced scan of the same scanning form as the current NTSC television signal.

FIG. 8 is an overall block diagram of this image sending unit. In the interlaced scanning image pickup unit 19, for example, the aspect ratio is 16: 9, the number of scanning lines is 525, 30 frames,
The image signal series VIS of the three primary color signals is generated by the 2: 1 interlaced scanning. Then, the A / D converter 20 performs sampling at a frequency of, for example, four times the color subcarrier fsc of the current NTSC television signal and converts it into a digital image signal series VID.

The interlace 4 to 3 converter 21 performs a 4 to 3 conversion process on the number of scanning lines to perform a 2: 1 interlaced scan in which the number of effective pixel scanning lines corresponding to the horizontally long image in the main part is 360. The image signal series VI and the vertical high frequency component YVH of the luminance lost by the 4 to 3 conversion are generated.

In the main signal encoder section 5, the current NT
Performs the same encoding processing as SC television signals,
An image signal VM of the main part area in a form in which a color signal is superimposed on a luminance signal is generated.

The vertical reinforcement signal encoder unit 6 performs processing such as time-axis compression and time series conversion of the vertical high frequency component YVH of luminance, and the vertical reinforcement signal VH to be superimposed on the mask region.
(The lower mask vertical reinforcement signal VHD,
An upper screen vertical reinforcement signal VHU) is generated in the lower mask area.

The multiplexing unit 7 superimposes the signal VH on the signal VM, and the process unit 8 adds a predetermined synchronization signal, burst signal, identification signal and the like. Then, it is converted into an analog signal by the D / A converter 9 to generate a letterbox EDTV television signal VS. FIG. 9 is an overall block diagram of this image receiving unit. The letterbox EDTV television signal VS is sampled by the A / D converter 10 at, for example, four times the frequency of the color subcarrier fsc and converted into a digital image signal VSD.

In the main signal decoder section 11, the current NT
Demodulation processing similar to SC television signals, that is, luminance / color signal separation and color demodulation, is performed, and the number of effective pixel scanning lines is 36.
It demodulates to an image signal series VI of the main part area of 0, 2: 1 interlaced scanning. In the vertical reinforcement signal decoder unit 12, the vertical reinforcement signal in the mask region is subjected to predetermined demodulation processing, that is, time series conversion, time axis expansion, and the like, to obtain the vertical high-frequency component YVH of the original luminance. Demodulate.

The interlace 3 to 4 conversion unit 22 performs 3 to 4 conversion processing of the number of scanning lines using the signal YVH, and the number of effective pixel scanning lines is 480 lines, 30 frames, 2: 1 interlaced scanning. An image signal series VID is generated.

The image signal series VIS converted into an analog signal by the D / A converter 23 is interlaced scan display 24.
Then, the image is reproduced by displaying in an aspect ratio of 16: 9, 525 scanning lines, 30 frames, and 2: 1 interlaced scanning.

As described above, according to the present embodiment, it is possible to realize a device capable of transmitting and receiving a high quality wide aspect ratio image and reducing the cost of the image receiving unit.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. This is suitable for further superimposing the horizontal reinforcement signal on the main area.

FIG. 10 is an overall block diagram of this image sending unit. In the interlaced scanning imaging unit 19, for example, the aspect ratio is 16: 9, the number of scanning lines is 525, 30 frames,
The image signal series VIS of the three primary color signals is generated by the 2: 1 interlaced scanning (the same scanning mode as the current NTSC television signal). Then, the A / D conversion section 20 performs sampling at a frequency, for example, four times the color subcarrier fsc of the current NTSC television signal, and converts it into a digital image signal series VID.

The interlace 4 to 3 conversion unit 21 performs a 4 to 3 conversion process on the number of scanning lines, and a 2: 1 interlaced scanning image having 360 effective pixel scanning lines corresponding to the horizontally long image of the main unit. The signal series VI and the vertical high frequency component YVH of the luminance lost in the 4 to 3 conversion processing are generated.

In the main signal encoder section 5, the current NT
Performs the same encoding processing as SC television signals,
An image signal VM of the main part area in a form in which a color signal is superimposed on a luminance signal is generated.

The vertical reinforcement signal encoder unit 6 performs processing such as time-base compression and time series conversion of the vertical high-frequency component YVH of luminance, and the vertical reinforcement signal VH to be superimposed on the mask region.
(The upper mask area is composed of the lower screen vertical reinforcement signal VHD, and the lower mask area is composed of the upper screen vertical reinforcement signal VHU)
To generate.

Further, the horizontal reinforcement signal encoder unit 17 generates a horizontal reinforcement signal HH by shifting the horizontal high frequency component YH of the luminance to a frequency band of 2 to 4 MHz by frequency shift processing.

In the multiplexer 7, these signals VM, VH,
The HH superimposition processing is performed, and the process unit 8 adds a predetermined synchronization signal, burst signal, identification signal, and the like. And
The D / A conversion unit 9 converts the signal into an analog signal, and generates a letterbox EDTV television signal VS in which the vertical reinforcement signal is superimposed on the mask area and the horizontal reinforcement signal is superimposed on the main area.

FIG. 11 is an overall block diagram of the image receiving section. Letterbox EDTV television signal V
S is sampled by the A / D converter 10 at a frequency four times as high as the color subcarrier fsc, for example, and converted into a digital signal VSD.

In the main signal decoder section 11, the current NT
Demodulation processing similar to that of SC television signals, that is, luminance / color signal separation and color demodulation is performed. The horizontal reinforcement signal decoder unit 18 extracts the horizontal reinforcement signal HH, performs frequency inverse shift processing, and demodulates the horizontal high-frequency component YH of the original luminance. Then, this signal YH is added to the luminance signal demodulated by the main signal decoder unit 11 to demodulate the image signal series VI in the main part region of the 2: 1 interlaced scan having 360 effective pixel scanning lines.

The vertical reinforcement signal decoder unit 12 performs a predetermined demodulation process on the vertical reinforcement signal in the mask region, that is, time series conversion, time axis expansion, etc., to obtain the vertical high frequency component YVH of the original luminance. Demodulate.

The interlace 3 to 4 converter 22 performs 3 to 4 conversion processing of the number of scanning lines using the signal YVH, and an image of 480 effective pixel scanning lines, 30 frames, 2: 1 interlaced scanning. A signal sequence VID is generated.

The image signal sequence VIS converted into an analog signal by the D / A converter 23 is interlaced scan display 24.
Then, the image is reproduced by displaying in the form of the interlace scanning with the aspect ratio of 16: 9, the number of scanning lines of 525, 30 frames, and 2: 1.

As described above, according to the present embodiment, it is possible to realize a device which transmits and receives a high-quality and high-definition image with a wide aspect ratio and which enables cost reduction of the image receiving unit.

Next, each block part of the above-mentioned embodiment will be described.

First, 4 to 3 conversion of the number of scanning lines in the image sending unit,
The 3-4 conversion in the image receiving unit will be described. FIG. 12 shows an outline of the signal processing for converting the number of scanning lines in the progressive scanning system. As shown in FIG. 7A, in the image sending unit, a progressive scanning signal sequence having 480 effective pixel scanning lines (abbreviated as 480P system)
4 to 3 conversion of the number of scanning lines for generating the signals of three scanning lines x, y, z from the signals of four scanning lines a, b, c, d of A progressive scanning signal sequence (abbreviated as 360P system) is generated. On the other hand, in the image receiving unit,
The number of scanning lines for generating signals of four scanning lines a ', b', c ', d'from three scanning lines x, y, z signals of 360P system is converted into 3 to 4, and 480P system is performed. Make a signal of. An example of a conversion matrix used for this scanning line number conversion is shown in FIGS. For the luminance signal, the image transmitting unit generates the scanning lines x, y, z of the 360P system and the vertical high frequency component YVH of the luminance by the conversion matrix from the signals of the scanning lines a, b, c, d of the 480P system. To do. Further, in the image receiving unit, the scanning lines x, y, z of the 360P system are used by the transmission conversion matrix.
And the signal YVH, the signals of the scanning lines a ', b', c ', d'of the 480P system are generated. On the other hand, with respect to the color difference signal, the number of scanning lines is converted by the conversion matrix shown in (c), and 480P system to 360P system to 480P.
Realize conversion to the system.

FIG. 13 shows an embodiment of the sequential 4 to 3 conversion section 3 of the image sending section, the construction of which is shown in FIG. 13A and the explanation of this operation is shown in FIG. The image signal series VPD including the three primary color signals RPD, GPD, BPD is converted into a series of luminance, color difference I, Q signals by a predetermined matrix calculation process in the YIQ conversion section 25, and a luminance component YPD, a color difference component IPD,
Generate QPD. In the calculation units 26 and 27, the calculation by the conversion matrix shown in FIG. 12B for the luminance component and the conversion matrix shown in FIG. 12C for the color difference component is performed, and the 360P scanning lines x, y, z, and A vertical high frequency component YVH of luminance is generated. Then, in the RAM 28, the WT (write) operation and the RD (read) operation of the signals of the scanning lines x, y, z are performed in the RAM 28 as shown in FIGS. Image signal sequence VP consisting of IP and QP
To generate.

FIG. 14 shows one embodiment of the sequential 3-4 conversion section 14 in the image receiving section. FIG. 14A is a configuration and FIG. The luminance signal YP and the color difference signals IP and QP of the 360P system are stored in the RAM 29 in the WT shown in FIG.
The writing and reading operations of the scanning lines x, y, and z are performed by the operation and the RD operation. Then, in the arithmetic units 30 and 31, FIG.
2 (b) and (c), the conversion matrix corresponding to the luminance and color difference components is used to perform 3 to 4 conversion processing of the number of scanning lines, and scanning lines a ', b', c ', d'of the 480P system. Generate the signal. The RGB conversion unit 32 performs conversion into a three-primary-color RGB signal series by a predetermined matrix calculation process,
An image signal series VPD including the three primary color signals RPD, GPD, BPD is generated.

Even in the interlaced scanning system, a signal series (480I system) having 480 effective pixel scanning lines and 360 effective pixel scanning lines are obtained by the same conversion matrix calculation processing.
4 to 3 conversion of the number of scanning lines with the book signal series (360I system),
3-4 conversion processing can be realized.

FIG. 15 shows the interlace 4 in the image sending unit.
3 is an example of the conversion unit 21. 3 primary color signals RID,
The interlaced scanning image signal series VID composed of GID and BID is subjected to predetermined matrix calculation processing in the YIQ conversion section 25 to be converted into a series of luminance, color difference I, Q signals, and luminance signal YID, color difference signals IID, QID. To generate. The arithmetic units 33 and 34 perform arithmetic operations using a conversion matrix similar to those shown in FIGS. 12B and 12C, and scan lines a of the 480I system a,
From the signals of b, c and d, scanning lines x, y, z of 360I system
And the vertical high-frequency component YVH of the luminance.
Then, in the RAM 35, a WT, similar to that in FIG.
Write signals of scanning lines x, y, z by RD operation,
A read operation is performed to generate an image signal series VI composed of a 360I luminance signal YI, color difference signals II, QI.

FIG. 16 shows the interlace 3 in the image receiving section.
4 is an example of the 4 conversion unit 22. The image signal series VI (luminance signal YI, color difference signals II, QI) of 360I system is
The signals of the scanning lines x, y, and z are written into and read from the RAM 36 by the WT and RD operations as shown in FIG. Then, the arithmetic units 37 and 38 perform 3 to 4 conversion processing of the number of scanning lines by the calculation of the conversion matrix, and perform 480I.
The signals of the scanning lines a ', b', c ', d'of the system are generated.
The RGB conversion unit 32 performs conversion into a three-primary-color RGB signal series by a predetermined matrix calculation process, and performs the three-primary-color signal R.
An image signal series VID including ID, GID, and BID is generated.

Next, the sequence in the image sending unit-interlace,
Interlace to progressive scan conversion in the image receiving unit will be described. FIG. 17 shows an outline of this signal processing. As shown in FIG. 4A, the image sending unit generates a signal of the interlaced scanning line L2n-1 by the average value of the two progressive scanning lines LP2n-1 and LP2n. Perform scan conversion. Therefore, in the interlaced scanning system, the signal of the scanning line L2n-1 of the first field is the scanning line LP2n-1, LP2n of the sequential scanning, and the signal of the scanning line L2n of the second field is the scanning line LP2n of the sequential scanning.
It is generated by the average value of the signals of LP2n + 1 to realize scan conversion. Regarding the luminance signal, the difference (LP2n-1-LP2n) / 2 between the signals of the two scanning lines in the sequential scanning is extracted as the vertical high frequency component YLD.

On the other hand, in the image receiving section, regarding the luminance signal,
Interlaced scanning line L2n-1, vertical high-frequency component Y
Addition (L2n-1 + YLD) / 2 with LD, subtraction (L2
scan line LP2n for progressive scanning by (n-1-YLD) / 2
By generating the signals -1 'and LP2n', scan conversion from interlace to progressive scan is performed. As for the color difference signal, the interpolation scanning line LP2n 'is obtained by averaging the signals of the scanning line L2n-1 of the interlaced scanning and the signals of the scanning lines LP2n-1' of the sequential scanning and the signals of the upper and lower scanning lines of the interlaced scanning. Signal is generated and scan conversion is performed. A conversion matrix for realizing these scan conversions is shown in FIG.

FIG. 18 shows an embodiment of the interlace conversion section 4 in the image transmission section. An image signal series V including a 360P progressive scan luminance signal YP, color difference signals IP, QP
The signals delayed by the P and 1H delay circuits 39 for one scanning line period are input to the arithmetic units 40 and 41. The calculation unit performs calculation using the conversion matrix shown in FIGS. 17B and 17C to generate a signal of the interlaced scanning system and a vertical high frequency component YLD of luminance. The scanning line sub-sampling unit 42 extracts the signal component generated by the calculation unit every two scanning line cycles of the sequential scanning, and the time axis expanding unit 43 extracts the time axis 2 signal.
Double expansion processing is performed to generate an image signal series VI including a luminance signal YI and color difference signals II and QI of 360I interlaced scanning. Then, scan conversion to interlaced scan is realized.

FIG. 19 shows the sequential conversion unit 13 in the image receiving unit.
FIG. An image signal series VI consisting of a luminance signal YI, color difference signals II and QI of 360I interlaced scanning, and a 1H delay circuit 44 for interlaced scanning 1
The signals delayed by the scanning line period are input to the arithmetic units 45 and 46. In the calculation unit, the conversion matrix using the vertical high-frequency component YLD is used for the horizontal low-frequency component of the luminance signal, and the conversion matrix for the color-difference signal is used for the horizontal high-frequency component of the luminance signal and the color-difference signal (FIG. 17C). Calculation is performed to generate signals corresponding to the scanning lines LP2n-1 'and LP2n' of the progressive scanning system. Then, the time-series conversion unit 47 performs 1/2 compression of the time axis and time-sequential rearrangement processing, and the 360P progressive scan luminance signal YP and color difference signal I.
An image signal series VP composed of P and QP is generated. Then, scan conversion from interlaced scan to progressive scan is realized.

Next, the vertical reinforcement signal encoder section 6 in the image transmitting section will be described with reference to the embodiment shown in FIG.
This is suitable for configuring the vertical reinforcement signal VH in a form in which the vertical high frequency components of the luminance signal are time-division multiplexed.
FIG. 7A is a diagram and FIG. 8B is a diagram for explaining the operation.

In order to superimpose the vertical high frequency components YVH and YLD of the luminance signal in the mask portion area, the information amount thereof is set to about 1.
It is necessary to compress to / 3, and in this embodiment, the amount of information is compressed by subsampling processing. First, the preprocessing unit 4
In No. 8, in order to remove a component that causes aliasing distortion by subsampling processing, band limiting processing is performed by filters. The sub-sampling processing unit 49 performs sub-sampling processing by thinning out sampling points and compression processing on the time axis. The multiplexing unit 50 selects and outputs both signals by time division. Then, the time-series conversion unit 51 performs time-series conversion and rearrangement processing, and the upper screen vertical reinforcement signal V corresponding to the upper screen of the main area.
The vertical reinforcement signal VH is generated by arranging HU in the lower matrix area and the lower screen vertical reinforcement signal VHD corresponding to the lower portion of the screen in the upper mask area.

Next, FIG. 21 shows an embodiment of the vertical reinforcement signal decoder section 12 of the image receiving section corresponding to this embodiment.
The separation unit 52 separates and extracts the vertical reinforcement signal VH superimposed on the upper and lower mask part regions. Demultiplex part 5
3, the vertical high frequency components YVH, Y multiplexed by time division
The signal component corresponding to the LD is separated. And
The time series inverse conversion unit 54 performs time series conversion and time axis expansion processing by inserting zero-valued sample points. Demodulator 5
In step 5, interpolation filtering processing is performed to reproduce the vertical high frequency components YVH and YLD of the original luminance.

In the present embodiment, the case of time division multiplexing is shown, but it is also possible to realize it in the form of frequency division multiplexing.

Next, an embodiment of the main signal encoder section 5 in the image sending section will be described with reference to FIG. 360I
The system luminance signal YI and the color difference signals II and QI are subjected to band limitation processing in the pre-combing units 56, 57 and 58 in the horizontal / vertical two-dimensional or in the horizontal / vertical / time three-dimensional frequency domain to obtain the luminance. A crosstalk component between the signal and the color signal is removed. The color modulator 59 performs quadrature amplitude modulation on the color difference I and Q signals with the color subcarrier fsc to generate a color signal C. Then, the luminance signal YL whose time delay is adjusted by the delay circuit 60
(0 to 4.2 MHz) and the color signal C are added by the adder circuit 61 to generate an image signal VM similar to the current NTSC television signal in which the color signal is superimposed on the luminance signal.

Next, an embodiment of the main signal decoder section 11 in the image receiving section will be described with reference to FIG. The YC separation unit 62 separates and extracts the luminance signal YL and the chrominance signal C, for example, with the characteristics of horizontal and vertical two-dimensional frequencies. The color demodulation unit 63 performs synchronous detection using the color subcarrier fsc,
The color difference signals II and QI are demodulated. On the other hand, the luminance signal whose time delay is adjusted by the delay circuit 64 (0 to 4.2MHz)
And a horizontal high frequency component YH (4.2 MHz or more) of the luminance demodulated by a horizontal reinforcement signal decoder unit described later is added by an addition circuit 65.
Then, both signals are added to demodulate the luminance signal YI. Then, the 360I-based image signal series VI is reproduced.

Next, an embodiment of the horizontal reinforcement signal encoder section 17 in the image sending section will be described with reference to FIG. As shown in FIG. 6B, this is because the horizontal reinforcement signal is a fukinuki hole in the first and third quadrants of the time / vertical two-dimensional frequency domain.
It is suitable for superimposing on (Fukinuki Hole). The pre-combing unit 66 performs band limitation in the horizontal, vertical, and temporal three-dimensional frequency regions, and removes the crosstalk component to the luminance signal YL and the color signal C. The horizontal high-frequency component YH (4.2)
.About.6.2 MHz). The frequency shifter 67 carries out carrier suppression amplitude modulation by the subcarrier μ ₀ (= 16 fsc / 7), extracts the lower sideband component (2 to 4 MHz), and generates the horizontal reinforcement signal HH. Note that the subcarrier μ ₀
As shown in FIG. 7B, the phase control is performed so that the phase is inverted every scanning line period and every frame period, and that the points of the same phase fall in each field. Also,
In the frequency shifter 67, it is desirable to perform modulation processing by complex signal processing in order to avoid mixing of aliasing components from the upper sideband accompanying sampling.

Next, an embodiment of the horizontal reinforcement signal decoder section 18 in the image receiving section will be described with reference to FIG. The separation unit 68 extracts the horizontal reinforcement signal HH superimposed on the Fukinuki Hole by the separation processing in the three-dimensional frequency domain of horizontal / vertical / time. Then, the frequency reverse shift unit 69
Then, the synchronous detection is performed using the subcarrier μ ₀ (= 16 fsc / 7), the 4.2 to 6.3 MHz signal component thereof is extracted, and the horizontal high frequency component YH of the luminance is demodulated.

Next, the image sending section of the fifth embodiment according to the present invention will be described with reference to the overall block diagram of FIG. This is suitable when the image pickup system is a scanning type of HDTV.

In the HDTV image pickup section 70, for example, the aspect ratio is 16: 9, the number of scanning lines is 1125, 30 frames,
An image signal series HDS of three primary color signals is generated in the form of 2: 1 interlaced scanning. Then, the A / D converter 71 converts the digital image signal series HDD by sampling.

The scan conversion unit 72 generates an image signal series VPD in the form of progressive scanning with 525 scanning lines, 60 frames, and 1: 1 by a predetermined scan conversion process.

In the sequential 4 to 3 conversion section 3, the number of scanning lines is 4 to
3 conversion processing is performed to generate a progressive scanning image signal series VP having 360 effective pixel scanning lines and a luminance high frequency component YVH lost in the 4 to 3 conversion processing.

The interlace conversion unit 4 performs scan conversion processing from progressive scanning to interlaced scanning, and
30 frames in the same scanning mode as C television signals,
Image signal series VI of 2: 1 interlaced scanning, and vertical high-frequency component Y of luminance lost in this scan conversion processing
Generate LD.

In the main signal encoder section 5, the current NT
Performs the same encoding processing as SC television signals,
An image signal VM of the main part area in a form in which a color signal is superimposed on a luminance signal is generated.

The vertical reinforcement signal encoder unit 6 performs processing such as time-axis compression of the vertical high-frequency components YVH and YLD of the luminance, time series conversion, time division multiplexing, etc., and the vertical reinforcement signal VH (upper part) to be superimposed on the mask portion region. The mask portion area generates a lower screen vertical reinforcement signal VHD and the lower mask portion area generates an upper screen vertical reinforcement signal VHU.

The multiplexer 7 superimposes the signals VM and VH,
The process unit 8 adds a predetermined synchronization signal, burst signal, identification signal, and the like. Then, it is converted into an analog signal by the D / A converter 9 to generate a letterbox EDTV television signal VS.

Since this image receiving section can be realized in the same manner as the embodiment shown in FIG. 3, the description thereof will be omitted.

Next, the image sending section of the sixth embodiment according to the present invention will be described with reference to the overall block diagram shown in FIG. This is suitable for further superimposing the horizontal reinforcement signal on the main area.

In the HDTV image pickup section 70, for example, the aspect ratio is 16: 9, the number of scanning lines is 1125, 30 frames,
An image signal series HDS of three primary color signals is generated in the form of 2: 1 interlaced scanning. Then, the A / D converter 71 converts the digital image signal series HDD by sampling.

The scan conversion unit 72 generates an image signal series VPD in the form of progressive scanning with 525 scanning lines, 60 frames, and 1: 1 by a predetermined scan conversion process.

Sequentially 4 to 3 In the conversion section 3, the number of scanning lines from 4 to
3 conversion processing is performed to generate a progressive scanning image signal series VP having 360 effective pixel scanning lines, and a vertical high frequency component YVH of luminance lost in 4 to 3 conversion processing.

The interlace conversion unit 4 performs scan conversion processing from progressive scanning to interlaced scanning, and the current NTS
30 frames in the same scanning mode as C television signals,
Image signal series VI of 2: 1 interlaced scanning, and vertical high-frequency component Y of luminance lost in this scan conversion processing
Generate LD.

In the main signal encoder section 5, the current NT
Performs the same encoding processing as SC television signals,
An image signal VM of the main part area in a form in which a color signal is superimposed on a luminance signal is generated.

The vertical reinforcement signal encoder unit 6 performs processing such as time base compression of the vertical high frequency components YVH and YLD of the luminance, time series conversion, time division multiplexing, and the like, and the vertical reinforcement signal VH (upper part) to be superimposed on the mask portion region. The mask portion area generates a lower screen vertical reinforcing signal VHD, and the lower mask portion area generates an upper screen vertical reinforcing signal VHU.

Further, the horizontal reinforcement signal encoder unit 17 shifts the horizontal high frequency component YH (4.2 MHz or more) of the luminance to the 2 to 4 MHz band by frequency shifting to generate the horizontal reinforcement signal HH to be superimposed on the main region. To do.

In the multiplexer 7, the signals VH and HH are added to the signal VM.
Are superimposed, and a predetermined synchronizing signal, burst signal, identification signal, etc. are added in the process unit 8. Then, the D / A converter 9
Converted to analog signal with and letterbox EDTV
The television signal VS is generated.

Since this image receiving section can be realized in the same manner as the embodiment shown in FIG. 7, its explanation is omitted.

As described above, according to the present embodiment, a high-quality, high-definition wide aspect ratio image is transmitted and received based on the image signal of the image pickup system of the scanning mode of HDTV, and the cost of the image receiving unit is low. A device that can be economically realized can be realized.

The vertical reinforcement signal has been described by taking the vertical high frequency components YVH and YLD of the luminance as an example in any of the embodiments.
The present invention is not necessarily limited to this, and it is also possible to realize with a vertical high frequency component of luminance other than this.

[0109]

According to the present invention, since an image can be reproduced by signal processing with a small time delay and a small memory capacity in the image receiving section, it is possible to realize an EDTV image receiving apparatus which is low in cost and excellent in economical efficiency. Therefore, it is also effective in promoting the spread of the letterbox EDTV.

[Brief description of drawings]

FIG. 1 is an overall block diagram of an image sending unit according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a vertical reinforcement signal of the image transmission unit output signal VS.

FIG. 3 is a block diagram of the entire image receiving unit according to the first embodiment.

FIG. 4 is an explanatory diagram of signal processing in an image receiving unit.

FIG. 5 is an overall block diagram of an image sending unit according to a second embodiment.

FIG. 6 is an explanatory diagram of a multiplexing form of a horizontal reinforcement signal.

FIG. 7 is an overall block diagram of an image receiving unit according to a second embodiment.

FIG. 8 is an overall block diagram of an image sending unit according to a third embodiment.

FIG. 9 is an overall block diagram of an image receiving unit according to a third embodiment.

FIG. 10 is an overall block diagram of an image sending unit according to a fourth embodiment.

FIG. 11 is an overall block diagram of an image receiving unit according to a fourth embodiment.

FIG. 12 is an explanatory diagram of signal processing of sequential 4-3 and 3-4 conversion.

FIG. 13 is an explanatory diagram of an example of an image sending unit sequential 4 to 3 conversion unit.

FIG. 14 is an explanatory diagram of an embodiment of the image receiving unit sequential 3-4 conversion unit.

FIG. 15 is a block diagram of an embodiment of an image transmission unit interlace 4 to 3 conversion unit.

FIG. 16 is a block diagram of an embodiment of an image receiving unit interlace 3 to 4 converting unit.

FIG. 17 is an explanatory diagram of signal processing of interlace and sequential conversion.

FIG. 18 is a block diagram of an embodiment of an image transmission unit interlace conversion unit.

FIG. 19 is a block diagram of an embodiment of an image receiving unit sequential conversion unit.

FIG. 20 is a block diagram of an embodiment of a vertical reinforcement signal encoder unit for an image transmitting unit.

FIG. 21 is an explanatory diagram of an embodiment of an image receiving unit vertical reinforcement signal decoder unit.

FIG. 22 is a block diagram of an embodiment of an image sending unit main signal encoder unit.

FIG. 23 is a block diagram of an embodiment of an image receiving unit main signal encoder unit.

FIG. 24 is an explanatory diagram of an example of a horizontal reinforcement signal encoder unit for an image sending unit.

FIG. 25 is an explanatory diagram of an embodiment of an image receiving unit horizontal reinforcement signal encoder unit.

FIG. 26 is an overall block diagram of an image sending unit according to a fifth embodiment.

FIG. 27 is an overall block diagram of an image sending unit according to a sixth embodiment.

[Explanation of symbols]

1 ... Sequential scanning imaging unit, 2 ... A / D conversion unit, 3 ... Sequential 4 to
3 conversion unit, 4 ... interlace conversion unit, 5 ... main signal encoder unit, 6 ... vertical reinforcement signal encoder unit, 7 ... multiplexing unit, 8 ... process unit, 9 ... D / A conversion unit.

Claims (5)

[Claims] 1. A letterbox type EDTV television signal transmission / reception system for transmitting / receiving a horizontally long image having a horizontally long aspect ratio different from 4: 3 by providing non-image areas at the top and bottom of the screen. The vertical reinforcement signal for improving the vertical resolution of the landscape image is divided into an upper screen vertical reinforcement signal corresponding to the upper screen of the landscape image and a lower screen vertical reinforcement signal corresponding to the lower screen of the landscape image, and the current field is divided. The upper screen vertical reinforcement signal corresponding to the horizontally long image is hung down to the non-image area at the bottom of the screen in the previous field, and the lower screen vertical reinforcement signal is hung to the non-image area at the top of the screen in the current field. A method of transmitting and receiving television signals. 2. A horizontally long image having a horizontally long aspect ratio based on an image signal picked up by a progressive scanning mode having an aspect ratio of 16: 9, 525 scanning lines, 60 frames, and 1: 1. A television signal transmission / reception system that constitutes a. 3. A horizontally long aspect ratio, based on an image signal picked up in an interlaced scanning mode having an aspect ratio of 16: 9, 525 scanning lines, 30 frames, and 2: 1. A method of transmitting and receiving television signals that make up an image. 4. The image signal picked up in the interlaced scanning mode according to claim 1, wherein the aspect ratio is 16: 9, the number of scanning lines is 1125, 30 frames, and 2: 1.
A television signal transmission / reception method that forms a landscape image with a landscape aspect ratio. 5. The transmission / reception of a television signal according to claim 1, 2, 3 or 4, wherein a horizontal reinforcement signal for improving the horizontal resolution of the horizontally long image is superimposed on an area of the horizontally long image having a horizontally long aspect ratio. method.