JPH05244570A - Configuration method for television signal - Google Patents

Abstract

PURPOSE:To avoid the effect of picture processing by demodulating two systems of video signal to decode a specific picture signal and forming a television signal of the letter box system with the picture signal. CONSTITUTION:A wide aspect ratio image pickup section 1 generates a 3-primary color picture signal VP of 1:1 sequential scanning, whose aspect ratio is e.g. 16:9 and whose scanning line number is 525. An encoder section 2 implements sequentially scanning conversion of interlace scanning and encode processing to generate 2 systems of decoded color television signals VS1, VS2. A studio device section 3 controls the picture processing to each of the signals VS1, VS2 through interlocked signal processing and outputs the signals VSP1, VSP2 subject to same picture processing synchronizingly. Then an EDTV encoder section 4 implements the demodulation processing of the two systems of signals and scanning conversion to the sequential scanning by rearrangement of the 2 systems of interlace scanning signal series to decode the signal series into the picture signal series of the sequential scanning form to form the television signal of the letter box system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a television signal, and more particularly, to a television signal construction suitable for a letter box system which is compatible with the current television system to widen the screen. Regarding the method.

[0002]

2. Description of the Related Art Research and development of an EDTV, which has compatibility with the current television system, aims at high image quality, high definition, and wide screen, and provides a more realistic image service, is under way. ..

One of the implementation modes of EDTV is called the letterbox method. In this system, non-image areas are provided above and below a display screen having an aspect ratio of the current television system to transmit a horizontally long image having a horizontally long aspect ratio. This system is characterized in that it can receive a horizontally long image with a horizontally long aspect ratio even when it is received by the current receiver, and there is little interference with the current receiver. For this reason, it is regarded as a promising form of realizing EDTV.

In the letterbox system, a television signal is formed in such a manner that information for achieving high definition is superimposed as an auxiliary signal on the upper and lower non-image areas of the screen. Regarding the method of configuring this television signal, Japanese Patent Laid-Open Publication Nos. 3-159388 and 3-198.
593, Kokai 3-206788, etc. are mentioned.

[0005]

When performing program production using the letterbox type television signal as the material constructed by the above-mentioned conventional technique, the upper and lower non-image parts are processed by various image processing in studio equipment. There is a problem that the auxiliary signal superimposed on the area is damaged.

An object of the present invention is to solve the above-mentioned problems, and to construct a letter box type television signal capable of operating a program production without trouble without being affected by various image processing in studio equipment. To provide.

[0007]

In order to achieve the above object, according to the present invention, two systems of video signals in the form of interlace scanning, which is the same as the current television system, are progressive scanning image signals having a horizontally long aspect ratio. In the studio equipment, various image processings necessary for program production are performed on the video signals of these two systems by a signal processing operation in synchronization with each other. Then, the image-processed video signals of the two systems are demodulated to restore a horizontally-scanned progressive-scan image signal having an aspect ratio, and the restored image signal constitutes a letterbox television signal.

[0008]

According to the present invention, various kinds of image processing in studio equipment are performed with two kinds of image signals generated from horizontally scanned image signals of progressive scanning, and the image processed two kinds of image signals are demodulated. An image signal in the form of progressive scanning is restored. Therefore, the restored image signal becomes a signal that retains high-quality and high-definition characteristics with high resolution, which is equivalent to that obtained by performing various image processes on the original progressive-scan image signal. Then, the restored high-definition image signal is used to generate a signal in the horizontally long screen portion and an auxiliary signal to be superimposed on the upper and lower non-image portions, thereby forming a letterbox television signal. Therefore, it is possible to realize a television signal structure capable of transmitting a high-quality and high-definition image even when image processing is performed in studio equipment.

In the present invention, the two systems of video signals are generated in the same signal form as the current television system. Therefore, it is possible to operate the two systems of the current studio equipment in a synchronized form and perform the image processing on the video signals of the two systems in a linked manner. Then, at the output of the two-system studio equipment, two-system video signals subjected to the same image processing are obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment according to the present invention will be described with reference to the block diagram shown in FIG.

The wide aspect ratio image pickup unit 1 generates an image signal VP of three primary colors by, for example, 1: 1 sequential scanning with an aspect ratio of 16: 9, the number of scanning lines of 525, and a frame frequency twice that of the current television system. ..

The encoder unit 2 performs scan conversion from progressive to interlaced scanning and an encoding process similar to the current television system, and has two systems of a composite color television of 525 scanning lines and 2: 1 interlaced scanning. The signals VS1 and VS2 are generated.

In the studio equipment section 3, two systems of studio equipment perform signal processing linked to the two systems of signals VS1 and VS2 to reduce, expand, and rotate images required for program production.
Image processing operations such as turn page, chroma key, and wipe are performed, and two systems of signals VSP1 and VSP2 subjected to the same image processing are output in synchronization.

The EDTV encoder unit 4 performs demodulation processing of signals of two systems and scan conversion into progressive scanning by rearranging operation of signal sequences of interlaced scanning of two systems to obtain an image signal sequence of a progressive scanning mode. Restore. Then, signal processing for constructing a television signal of a letterbox system with respect to the restored image signal series, that is, scanning line number conversion, sequential to interlaced scan conversion, generation of a horizontally long image portion by encoding processing, and vertical Auxiliary signal is generated by high frequency components. Then, a letter box type television signal V0 compatible with the current television type is produced.

Each block section in this embodiment will be described below.

FIG. 2 is a block diagram of an embodiment of the encoder unit 2.

The image signals VP of the three primary colors of progressive scanning are A /
The D conversion unit 5 performs sampling at a frequency that is eight times the color subcarrier f _SC of the current television system, for example, and converts it into a digital signal. Then, the YIQ conversion section 6 performs conversion from the three primary color signals into the luminance and color difference I and Q signals by a predetermined matrix calculation operation, and the luminance signal YP and the color difference signals IP and QP.
To make.

The interlaced scanning conversion unit 7 performs scanning conversion into interlaced scanning by a 2: 1 thinning operation of scanning lines, and a signal series Y of two interlaced scanning systems.
Make 1, I1, Q1 and Y2, I2, Q2.

The color conversion section 8 performs quadrature amplitude modulation on the color difference signals I1, Q1 and I2, Q2 with the color subcarrier f _SC .
Create color signals C1 and C2.

The multiplexing unit 9 adds the color signals C1 and C2 to the luminance signals Y1 and Y2, respectively, and multiplexes them to add a synchronizing signal and a burst signal. Then, the D / A converter 10 converts the analog signals into analog signals to generate composite color television signals VS1 and VS2 similar to the current television system.

FIG. 3 is an explanatory diagram of scan conversion in the interlaced scan conversion unit 7. With respect to the sequential scanning signal series, the first series of interlaced scanning signal series Y1, I1, and Q1 are generated by the scanning line signal series indicated by the white circles in FIG. On the other hand, the signal series Y of the second series of interlaced scans is generated by the signal series of the scanning lines indicated by the dots of the progressive scanning.
2, I2, Q2 are generated.

FIG. 4 shows an embodiment of the interlaced scanning conversion unit 7. The scan conversion function is realized by the configuration of the memory A circuit 11, the memory B circuit 12, and the control circuit 13 that controls these operations shown in FIG. Figure 4 (b)
Signals YP, IP, QP alternately write signals of the scanning lines to the memories A, B circuits by the alternate WT operation for each scanning line at the rate of the progressive scanning system as shown in FIG. On the other hand, the memory circuit reads out by the RD operation in which one scanning line period at the rate of the interlaced scanning system is a cycle, and generates the signal sequences of the interlaced scanning first and second systems.

Next, the EDTV encoder unit 4 will be described with reference to the block diagram of one embodiment shown in FIG.

Two systems of composite color television signals VSP1 and VSP2 subjected to image processing for program production.
Is sampled by the A / D converter 14 at a frequency four times as high as that of the color subcarrier and converted into a digital signal.

The YC separation unit 15 performs a brightness / color signal separation operation by a horizontal / vertical two-dimensional comb filter or a horizontal / vertical / time three-dimensional motion adaptive brightness / color signal separation operation. The components Y1 and Y2 and the color signal components C1 and C2 are extracted.

In the color demodulation section 16, the color signal components C1 and C2
_{Are subjected} to synchronous detection with the color subcarrier f _sc to demodulate the color difference signals I1, Q1 and I2, Q2.

In the progressive scan conversion unit 17, as will be described later, 2
The interlaced scanning signal series Y1, I1, Q1 and Y2, I2, Q2 are rearranged to perform scanning conversion into sequential scanning. A signal sequence YP, IP, QP for 1: 1 progressive scanning is created.

As will be described later in detail, the scanning line number converting section 18 converts a signal sequence of 480 effective pixel scanning lines into a signal sequence of 480 effective pixel scanning lines by an operation such as conversion of scanning lines into 4 to 3. The number of scanning lines is converted into a series, and a signal series YP ', I corresponding to a horizontally long image portion of the letterbox system is obtained.
Create P'and QP '.

The scan conversion section 19 performs scan conversion into interlaced scanning by a 2: 1 thinning operation of scanning lines, and a 2: 1 interlaced scanning signal series YI, II having the same form as the current television system. , Make QI.

In the main signal modulator 20, as in the current television system, the color signal obtained by quadrature amplitude modulating the color difference signal with the color subcarrier f _SC is multiplexed with the luminance signal to generate the video signal HM corresponding to the horizontally long image portion. to make.

In the high frequency component extracting section 21, the signals YP, Y
A signal component HS necessary for high definition such as horizontal and vertical high frequency components is extracted from P '. Then, the auxiliary signal modulator 2
In step 2, predetermined processing such as time series conversion and time division multiplexing is performed to generate the auxiliary signal HP to be superimposed on the upper and lower non-image area.

The process section 23 superimposes the auxiliary signal HP on the video signal HM and adds a synchronizing signal, a burst signal, an identification signal and the like. Then, the D / A converter 24 converts the analog signal into an analog signal to generate a letterbox television signal VO.

Each block of the EDTV encoder unit 4 will be described below based on an embodiment.

FIG. 6 is an explanatory diagram of the signal processing of the scan conversion in the progressive scan conversion unit 17. By the rearrangement operation of the signals of the scanning lines indicated by the white circles of the first system (Y1, I1, Q1) and the signals of the scanning lines indicated by the dots of the second system (Y2, I2, Q2) of the interlaced scanning system, A signal series YP, IP, QP of a progressive scanning system as shown in the figure is generated, and interlace-next scan conversion is performed.

FIG. 7 shows an embodiment of the progressive scan conversion unit 17. As shown in FIG. 7A, the progressive scan converter includes a memory A circuit 25, a memory B circuit 26, a selection circuit 27, and a control circuit 28 that controls the operation of these circuits. As shown in FIG. 7B, the signals of the first and second systems are written in the memory A circuit and the memory B circuit by the WT operation with a period of one scanning line period at the rate of the interlaced scanning system. On the other hand, at the rate of the progressive scanning system, the memory A circuit and the memory B circuit are alternately read by the RD operation for each scanning line, and the selection circuit 27 selects and outputs the signal read from the memory circuit. Scan-converted signals YP, IP, and QP are generated in the scanning system.

Next, FIG. 8 shows signal processing in the scanning line number converting section 18. FIG. 3A is a conceptual diagram of the letterbox method. A signal with an aspect ratio of 16: 9 and 480 effective pixel scanning lines is compressed to 3/4 by converting the number of scanning lines, and the aspect ratio of 16: 9 is displayed in the display screen of the current television system with an aspect ratio of 4: 3. , Is displayed as a horizontally long image with 360 effective pixel scanning lines. FIG. 9B shows the conversion of the number of scanning lines by the conversion of 4 to 3. This is four scan lines a, b,
The coefficient values k ₁ and k ₂ are weighted and added to the signals of c and d to generate three signals of scanning lines indicated by diagonal lines. An example of scanning line number conversion by the 4 to 3 conversion is shown in FIG. 9A, and its operation is shown in FIG. 9B. The signal YP and the signal delayed by the 1H delay circuit 29 for one scanning line period are weighted by the coefficient weighting circuit 30 by the coefficient values k ₁ and k ₂ , and the addition circuit 3
At 1, the both are added to generate a scanning line signal which has been converted into 4 to 3 and is written in the memory circuit 32. This writing is performed by the WT operation in the period of 480 scanning lines in one frame period of the progressive scanning system and in the period of 3 scanning lines for every 4 scanning lines. Then, the signals of 360 scanning lines converted by the number of scanning lines are written in the memory circuit. On the other hand, the signal is read from the memory circuit by the RD operation in the 360 scanning line period corresponding to the horizontally long image portion in one frame period of the progressive scanning system, and the signal YP ′ having the converted number of scanning lines is generated. During the period in which the RD operation from the memory circuit is not performed, the luminance signal YP 'has, for example, a black level and a color difference signal I.
P'and QP 'are replaced with zero (achromatic) signals. The control circuit 33 produces signals necessary for these operations.

Next, FIG. 10A shows an embodiment of the scan conversion unit 19, and FIG. 10B shows its operation. Signal Y
P '(IP', QP ') writes a signal for every two scanning lines to the memory circuit 34 by the WT operation of every other scanning line of the sequential scanning system. On the other hand, the signal is read from the memory circuit by the RD operation in which one scanning line period of the interlaced scanning system is a cycle, and the signal YI (II, Q
I) is generated. The signals necessary for these operations are generated by the control circuit 35.

Next, FIG. 11 shows an embodiment of the main signal modulator 20. The luminance signal YI and the color difference signals II, QI are band-limited by the LPF circuits 36, 37, 38 in the same manner as in the current television system. In the color signal modulation circuit 39, the color difference signals I and Q are subjected to quadrature amplitude modulation with the color subcarrier f _SC to generate a color signal C. In the adding circuit 40, the color signal C is added to the luminance signal YL.
Are added and multiplexed to generate a video signal HM corresponding to the horizontally long image portion.

FIG. 12 shows another embodiment of the main signal modulator 20, in which the horizontal high frequency component of the luminance signal exceeding the band determined by the current television system is shifted to a low frequency and superimposed. In the HPF circuit 41, the luminance signal of 4.2M
A component above Hz is extracted as a horizontal high frequency component Yh. In the frequency shift circuit 42, the subcarrier μ ₀ (μ ₀ = 16f _SC /
7. The phase is inverted every line period and every frame period, and the carrier suppression amplitude modulation is performed at the point where the same phase falls in each field) to produce a high-definition signal Yh 'frequency-shifted to 2 to 4.1 MHz. ..

On the other hand, the LPF circuits 36, 37 and 38 limit the predetermined frequency band, and the color signal modulating circuit 39 quadrature amplitude modulates the color difference signal with the color subcarrier f _SC to obtain the color signal c.
Bring

The spatiotemporal filters 43 and 44 are provided for the luminance signal Y.
In order to avoid crosstalk between the L, color signal c, and high-definition signal Yh ', band limitation is performed in a three-dimensional area of horizontal, vertical, and time. FIG. 13A shows a characteristic example of the space-time filter 43. Then, FIG. 13B shows a characteristic example of the space-time filter 44. The adder circuit 40 adds and multiplexes the signals to generate a video signal HM corresponding to the horizontally long image portion.

Next, FIG. 14 shows an embodiment of the high frequency component extraction unit 21. In the scanning line number inverse conversion unit 45, the number of scanning lines 3 to
The number of scanning lines is inversely converted by 4 conversion, and the number of effective pixel scanning lines is 360 from the signal YP ′ to 48 effective pixel scanning lines.
Creates 0 signal YPR. Then, the subtraction circuit 49 performs a subtraction operation with the signal YP whose time delay has been adjusted by the delay circuit 46, and performs 4 to 3 conversion of the scanning line on the image sending side of the letterbox system and 3 to 4 conversion on the image receiving side. The high frequency component VH in the vertical direction, which is lost by the compression / expansion operation of the number of scanning lines, is extracted.

The signal YP 'and the 1H delay circuit 47 are also provided.
Then, the signal delayed by one scanning line period is subtracted by a subtracting circuit 49 to extract a vertical high frequency component LD lost by the interlaced scanning.

On the other hand, the HPF circuit 48 extracts a horizontal luminance high frequency component (4.2 MHz or more) exceeding the frequency band determined by the current television system, and the frequency conversion circuit 5
At 0, the frequency shift operation by amplitude modulation is performed to create a horizontal high frequency component HH shifted to a low frequency.

The selection circuit 51 selects and outputs a predetermined signal component determined by the letterbox method as the signal HS.

Next, FIG. 15 shows an embodiment of the auxiliary signal modulator 22. This is suitable when the auxiliary signal is generated in the form of time division multiplexing.

The signal HS is subjected to a predetermined band limitation by the pre-filter circuit 52, and the sampling point thinning circuit 53 performs a thinning operation of, for example, 4: 1 sampling points. And
The time axis compression circuit 54 performs a four times time axis compression operation. Further, the time-series conversion circuit 55 performs a time-series conversion process such as a rearrangement operation of the signal series to generate the auxiliary signals HP in the upper and lower non-image area.

The description of the EDTV encoder section 4 has been completed, and a configuration example of the studio equipment section 3 will be described with reference to FIG. The DVP device 56 is a switcher, D
It is composed of VE (digital video effect) etc.
Various image processing required for program production, such as image reduction, extension, rotation, turn page, wipe, chroma key, etc. are performed. Two-system composite color television signal VS
1 and VS2 are input to the DVP device 56 of two systems, respectively. Then, the DVP device 56 performs predetermined image processing in an operation in which the two systems are synchronized and interlocked in accordance with a control signal from the control unit 57, and outputs composite color television signals VSP1 and VSP2 of the processed image.

As described above, according to this embodiment, a letterbox type television signal capable of transmitting and receiving high-quality and high-definition images without being affected by various image processing in studio equipment is constructed. it can.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to the block diagram shown in FIG. This is suitable for an image pickup system having an HDTV specification.

In the HDTV image pickup section 58, the aspect ratio is 1
Image signal V of three primary colors by 6 to 9, 1125 scanning lines, 2: 1 interlaced scanning (1: 1 sequential scanning is also possible)
Generate HD.

The down-conversion unit 59 performs scan conversion processing, the aspect ratio is 16: 9, and the number of scanning lines is 525.
This is converted into an image signal VP of three primary colors of 1: 1 progressive scanning with a frame frequency twice that of the present television system.

The encoder unit 2 generates signals for two systems of interlaced scanning by sequentially performing interlaced scanning conversion and performs an encoding process similar to that of the current television system to obtain 525 scanning lines and 2: 1 interlace. Race-scan composite color television signals VS1 and VS2 are generated.

In the studio equipment section 3, two systems of signal VS
1 and VS2 are input to two studio devices that operate in synchronization, and image processing required for program production, such as image reduction, extension, rotation, turnpage, wipe, chroma key, etc., is performed in conjunction. , And outputs composite color television signals VSP1 and VSP2 of the same processed image.

The EDTV encoder unit 4 restores the original image signal sequence in the form of progressive scanning by demodulating the signals of the two systems and rearranging the signal sequences. Then, predetermined signal processing of the letter box method for the restored progressive scanning image signal series, that is, scanning line number conversion, sequential ...
Processing such as interlaced scan conversion, color modulation, and auxiliary signal generation is performed to generate a letterbox type television signal V0 compatible with the current television method.

As described above, according to the present embodiment, it is possible to construct a letterbox type television signal for transmitting and receiving high quality and high definition images without being affected by various image processing in studio equipment.

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

The wide aspect ratio image pickup unit 1 generates an image signal VP of three primary colors of aspect ratio 16: 9, 525 scanning lines, and 1: 1 progressive scanning with a frame frequency twice as high as that of the current television system.

The encoder section 60 generates signals for two systems of interlaced scanning by progressive to interlaced scanning conversion, performs the same encoding processing as in the current television system, and has 525 scanning lines and 2: 1 interlaced scanning. A scanning composite color television signal VS1 and a monochrome television signal YS2 are generated.

In the studio equipment section 3, the signals VS1 and YS2 are inputted to the two systems of studio equipment which operate in synchronization, respectively, for example, image reduction, which is necessary for program production,
Image processing such as decompression, rotation, turn page, wipe, and chroma key is performed in tandem, and a composite color television signal VSP1 and a monochrome television signal YSP2 of the same processed image are output.

The EDTV encoder unit 61 restores the original image signal sequence in the form of progressive scanning by demodulating the signals of the two systems and rearranging the signal sequences. Then, predetermined signal processing of the letter box system is performed on this image signal sequence, that is, scanning line number conversion, sequential to interlace scanning conversion, color modulation, auxiliary signal generation, etc. are performed, and compatibility with the current television system is achieved. The television signal V0 of the letterbox system which it has is generated.

FIG. 19 is a block diagram of an embodiment of the encoder section 60 in this embodiment.

The image signals VP of the three primary colors of progressive scanning are A /
The D conversion unit 5 performs sampling at a frequency that is eight times the color subcarrier f _SC of the current television system, for example, and converts it into a digital signal. Then, the YIQ conversion section 6 converts the three primary color signals into signals of luminance and color differences I and Q by a predetermined matrix calculation operation to generate a luminance signal YP and color difference signals IP and QP.

The interlaced scan conversion section 7 performs scan conversion into interlaced scan by a scanning line 2: 1 thinning operation, and the two series of interlaced scan signal series Y1.
Create I1, Q1 and Y2.

The color modulator 8 quadrature amplitude-modulates the color difference signals I1 and Q1 with the color subcarrier f _SC to produce a color signal C1. Then, the multiplexing unit 9 adds and multiplexes the color signal C1 to the luminance signal Y1, and adds a synchronization signal and a burst signal. And D
The / A converter 10 converts the analog signal into an analog signal to generate a composite color television signal VS1.

On the other hand, the luminance signal Y2 is added with a synchronizing signal and a burst signal in the multiplexer 9 and converted into an analog signal in the D / A converter 10 to generate a monochrome television signal YS2.

FIG. 20 is a block diagram of an embodiment of the EDTV encoder section 61.

The composite color television signal VSP1 and the black-and-white television signal YSP2 which have been subjected to image processing in the studio equipment section are, for example, in the A / D conversion section 14 a color subcarrier f.
Sampling is performed at a frequency four times that of _SC , and it is converted into a digital signal.

The YC separation unit 15 performs a brightness / color signal separation by a horizontal / vertical two-dimensional comb filter or a horizontal / vertical / time three-dimensional motion adaptive brightness / color signal separation operation to obtain the brightness / color signal. The component Y1 and the color component C1 are extracted.

In the color demodulation section 16, the color component C1 is synchronously detected by the color subcarrier f _SC to demodulate the color difference signals I1 and Q1. Then, the interpolating scan line generating unit 63 generates the signal of the interpolating scan line by the average value of the signals of the upper and lower scan lines in the same field, and the color difference signals I2, Q of the monochrome television signal system.
Used as 2. The delay circuit 62 adjusts the time delay generated in the signal processing of YC separation, color demodulation, and scanning line interpolation of the luminance signal Y2 of the monochrome television signal system.

In the progressive scan conversion unit 17, two series of interlaced scan signal sequences Y1, I1, Q1 and Y2, I.
Scan conversion to progressive scanning is performed by rearranging operation of 2, Q2, and the number of scanning lines is 525, and the signal series YP, I of 1: 1 progressive scanning having twice the frame frequency of the current television system.
Generate P and QP.

In the scanning line number converter 18, the scanning lines 4 to 3
The number of scanning lines is converted by the conversion to generate a signal series YP ', IP', QP 'having 360 effective pixel scanning lines corresponding to the horizontally long image portion of the letterbox system. Then, the scan conversion unit 19 performs scan conversion to interlaced scanning by a 2: 1 thinning operation of scanning lines, and outputs a 2: 1 interlaced scanning signal sequence YI, II, QI of the same form as the current television system. To generate.

In the main signal modulator 20, the color difference signals II and QI are supplied to the color subcarrier f _SC , as in the current television system.
The quadrature amplitude modulated chrominance signal is multiplexed with the luminance signal to generate a video signal HM corresponding to the horizontally long image portion.

On the other hand, in the high frequency component extraction section 21, the signal Y
Based on P and YP ', horizontal and vertical high frequency components required for high definition are extracted as a signal HS. Then, the auxiliary signal modulator 22 performs predetermined signal processing such as time series conversion and time division multiplexing to generate the auxiliary signal HP to be superimposed on the upper and lower non-image area.

The process section 23 superimposes the auxiliary signal HP on the video signal HM and adds a synchronizing signal, a burst signal, an identification signal and the like. Then, the D / A converter 24 converts the analog signal into an analog signal to generate a letterbox television signal V0.

FIG. 21 shows an embodiment of the interpolation scanning line generating section 63. Signal I1 (Q1) and 1H delay circuit 64
The coefficient weighting circuit 6 is applied to the signal delayed by one scanning line period.
In 5, the coefficient value ½ is weighted, and the addition circuit 66 adds the two to generate a signal I2 (Q2) of the interpolation scanning line.

As described above, according to this embodiment, a letterbox type television signal for transmitting and receiving high quality and high definition images without being affected by various image processing in studio equipment is constructed. it can.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
This will be described with reference to the block diagram shown in FIG. This is HDT
It is suitable for a V specification imaging system.

In the HDTV image pickup section 58, the aspect ratio is 1
The image signal VHD of three primary colors is generated by 6 to 9, 1125 scanning lines, and 2: 1 interlaced scanning (1: 1 sequential scanning is also possible).

The down-conversion unit 59 performs scan conversion processing, the aspect ratio is 16: 9, and the number of scanning lines is 525.
This is converted into an image signal VP of three primary colors of 1: 1 progressive scanning with a frame frequency twice that of the present television system.

The encoder section 60 generates signals for two systems of interlaced scanning by progressive-to-interlaced scanning conversion, performs the same encoding processing as in the current television system, and has 525 scanning lines and 2: 1 interlaced scanning. A scanning composite color television signal VS1 and a monochrome television signal YS2 are generated.

In the studio equipment section 3, the signals VS1 and YS2 are respectively input to the two systems of studio equipment which operate in synchronization, and for example, image reduction, which is necessary for program production,
Image processing such as expansion, rotation, turnbage, wipe, and chroma key is performed in conjunction with each other to output a composite color television signal VSP1 and a monochrome television signal YSP2 of the same processed image.

The EDTV encoder section 61 restores the original image signal system in the form of progressive scanning by demodulating the signals of the two systems and rearranging the signal sequences. Then, predetermined signal processing of the letter box system is performed on this image signal sequence, that is, scanning line number conversion, sequential to interlace scanning conversion, color modulation, auxiliary signal generation, etc. are performed, and compatibility with the current television system is achieved. The television signal V0 of the letterbox system which it has is generated.

As described above, according to this embodiment, it is possible to construct a letterbox type television signal capable of transmitting and receiving high-quality and high-definition images without being affected by various image processing in studio equipment.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
It will be described with reference to the block diagram shown in FIG. This is suitable for an image signal obtained from a FIT type solid-state image pickup unit having an electronic shutter mechanism.

In the FET type solid-state image pickup unit 67, an aspect ratio of 16: 9 with a storage time of, for example, 1/60 seconds, a number of scanning lines of 525, and a frame frequency of 1: 1 which is the same as that of the current television system are used by an electronic shutter mechanism. An image signal VCD of three primary colors of progressive scanning is generated.

In the up-convert unit 68, as shown in FIG. 24, for example, by repeating the signal of the previous frame, the signal of the scanning line shown by the dot in the figure is made by the operation of the frame interpolation, and the signal of the interpolation frame is thereby obtained. To generate. Then, it is converted into an image signal VP of three primary colors of 525 scanning lines and 1: 1 sequential scanning of a frame frequency which is twice that of the current television system.

The encoder unit 2 generates signals for two systems of interlaced scanning by progressive to interlaced scanning conversion and performs an encoding process similar to that of the current television system to obtain 525 scanning lines and 2: 1 interlace. Race-scan composite color television signals VS1 and VS2 are generated.

In the studio equipment section 3, there are two systems of signal VS.
1, VS2 are input to two systems of studio equipment that operate in synchronization, and image processing required for program production, for example, image reduction, extension, rotation, turn page, wipe, chroma key, etc. are linked. Then, composite color television signals VSP1 and VSP2 of the same processed image are output.

The EDTV encoder unit 4 restores the original image signal series in the form of progressive scanning by demodulating the signals of the two systems and rearranging the signal series. Then, predetermined signal processing of the letter box method for the restored progressive scanning image signal series, that is, scanning line number conversion, sequential ...
Processing such as interlaced scan conversion, color modulation, and auxiliary signal generation is performed to generate a letterbox type television signal V0 compatible with the current television method.

As described above, according to the present embodiment, it is possible to construct a letterbox type television signal for transmitting and receiving high quality and high definition images without being affected by various image processing in studio equipment.

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

In the FIT type solid-state image pickup unit 67, the aspect ratio is 16: 9, the number of scanning lines is 525, the frame frequency is the same as that of the current television system, 1: 1, for example, the accumulation time is 1/60 seconds by the electronic shutter mechanism. An image signal VCD of three primary colors of progressive scanning is generated.

The up-converter 68 generates an interpolation frame signal by repeating the signal of the previous frame by the operation of frame interpolation, and the number of scanning lines is 525, and the frame frequency is twice that of the current television system, 1: 1 sequence. Scanning 3
It is converted into the primary color image signal VP.

The encoder unit 60 generates signals for two systems of interlaced scanning by progressive to interlaced scanning conversion, performs the same encoding processing as in the current television system, and has 525 scanning lines and 2: 1 interlaced scanning. A scanning composite color television signal VS1 and a monochrome television signal YS2 are generated.

In the studio equipment section 3, the signals VS1 and YS2 are input to the two systems of studio equipment which operate in synchronization with each other, for example, image reduction, which is necessary for program production,
Image processing such as decompression, rotation, turn page, wipe, and chroma key is performed in conjunction with each other to output a composite color television signal VSP1 and a monochrome television signal YSP2 of the same processed image.

The EDTV encoder unit 61 restores the original image signal series in the form of progressive scanning by demodulating the signals of the two systems and rearranging the signal series. Then, predetermined signal processing of the letter box system is performed on this image signal sequence, that is, scanning line number conversion, sequential to interlace scanning conversion, color modulation, auxiliary signal generation, etc. are performed, and compatibility with the current television system is achieved. The television signal V0 of the letterbox system which it has is generated.

As described above, according to the present embodiment, a letterbox type television signal capable of transmitting and receiving a high-quality and high-definition image without being affected by various image processing in studio equipment can be constructed.

By the above-described embodiments and combinations thereof, it is possible to construct various types of letterbox type television signals as described below in the present invention.

(1) A high frequency component in the vertical direction is superimposed on the upper and lower non-image areas, and a high frequency component in the horizontal direction is superimposed on the horizontally long image area.

(2) The high-frequency components in the horizontal and vertical directions are superimposed on the upper and lower non-image areas.

(3) A high frequency component in the horizontal direction is superimposed on the horizontally long image portion area.

(4) Only the high frequency component in the vertical direction is superimposed on the upper and lower non-image areas.

(5) Only the high frequency component in the horizontal direction is superimposed on the upper and lower non-image areas.

(6) The high frequency components in the horizontal and vertical directions are not superposed.

Further, in the embodiment, the configuration of the studio equipment part has been described by taking the combination of the switcher and the DVE as an example, but other studio equipments such as VTR, FS,
The present invention can be applied to a combination of various things such as a color collector.

[0107]

According to the present invention, a letterbox system compatible with the current television system capable of transmitting and receiving high-quality and high-definition images without being affected by various image processing in studio equipment. Of the television signal can be configured.

[Brief description of drawings]

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

FIG. 2 is a block configuration diagram of an encoder unit according to the first embodiment.

FIG. 3 is an explanatory diagram of signal processing of an interlace scan converter according to the first embodiment.

FIG. 4 is a configuration example of an interlaced scan converter.

FIG. 5 is a block diagram of the EDTV encoder of the first embodiment.

FIG. 6 is an explanatory diagram of signal processing of a progressive scan conversion unit.

FIG. 7 is a configuration example of a progressive scan conversion unit.

FIG. 8 is an explanatory diagram of signal processing of a scanning line number conversion unit.

FIG. 9 is a configuration example of a scanning line number conversion unit.

FIG. 10 is a configuration example of a scan conversion unit.

FIG. 11 shows an example of a main signal modulator.

FIG. 12 is another example of a main signal modulator.

FIG. 13 is a characteristic diagram of a space-time filter.

FIG. 14 shows an example of a high frequency component extraction unit.

FIG. 15 shows an example of an auxiliary signal modulator.

FIG. 16 shows an example of a studio equipment section.

FIG. 17 is a block configuration diagram of a second embodiment of the present invention.

FIG. 18 is a block configuration diagram of a third embodiment of the present invention.

FIG. 19 is a block configuration diagram of an encoder unit according to a third embodiment.

FIG. 20 is a block configuration diagram of an EDTV encoder unit.

FIG. 21 is an example of an interpolation scanning line generation unit.

FIG. 22 is a block configuration diagram of a fourth embodiment of the present invention.

FIG. 23 is a block configuration diagram of a fifth embodiment of the present invention.

FIG. 24 is an explanatory diagram of signal processing of the up-conversion unit according to the fifth embodiment.

FIG. 25 is a block configuration diagram of a sixth embodiment of the present invention.

[Explanation of symbols]

1 ... Wide aspect ratio imaging unit, 2 ... Encoder unit, 3
… Studio equipment, 4… EDTV encoder, 5… A
/ D converter, 6 ... YIQ converter, 7 ... Interlaced scan converter, 8 ... Color modulator, 9 ... Multiplexer, 10 ... D / A converter, 11 ... Memory A circuit, 12 ... Memory B circuit, 13 ...
Control circuit, 14 ... A / D converter, 15 ... YC separator, 1
6 ... Color demodulation unit, 17 ... Sequential scan conversion unit, 18 ... Scan line number conversion unit, 19 ... Scan conversion unit, 20 ... Main signal modulation unit,
21 ... High-frequency component extraction section, 22 ... Auxiliary signal modulation section, 23 ...
Process unit, 24 ... D / A conversion unit, 25 ... Memory A circuit, 26 ... Memory B circuit, 27 ... Selection circuit, 28 ... Control circuit, 29 ... 1H delay circuit, 30 ... Coefficient weighting circuit, 31
... adder circuit, 32 ... memory circuit, 33 ... control circuit, 34
... memory circuit, 35 ... control circuit, 36, 37, 38 ... L
PF circuit, 39 ... Color signal modulation circuit, 40 ... Addition circuit, 4
1 ... HPF circuit, 42 ... Frequency shift circuit, 43, 44
... Spatio-temporal filter, 45 ... Scan line number inverse conversion unit, 46 ... Delay circuit, 47 ... 1H delay circuit, 48 ... HPF circuit, 49
... subtraction circuit, 50 ... frequency conversion circuit, 51 ... selection circuit,
52 ... Pre-filter circuit, 53 ... Sampling point sampling circuit, 5
4 ... Time axis compression circuit, 55 ... Time series conversion circuit, 56 ... D
VP device, 57 ... control unit, 58 ... HDTV image pickup unit, 59
… Down-converter, 60… Encoder, 61… E
DTV encoder section, 62 ... Delay circuit, 63 ... Interpolation scanning line generation section, 64 ... 1H delay circuit, 65 ... Coefficient addition circuit,
66 ... Adder circuit, 67 ... FIT type solid-state imaging section, 68 ... Up-convert section.

Claims (6)

[Claims] 1. A method for constructing a television signal of a letterbox system, in which a landscape image having a landscape aspect ratio different from that of a current television system is transmitted by providing non-image areas on the upper and lower sides of a screen. Means for generating two systems of video signals in the same interlaced scanning mode as the current television system by progressive scanning image signals of various aspect ratios, and various image processing in studio equipment for the two systems of video signals Means for generating two systems of video signals of the same processed image by performing the above operations in synchronism, and demodulating the two systems of video signals of the processed image, a horizontal scanning image signal sequence of progressive scanning A method of configuring a television signal, characterized in that a letterbox type television signal is configured by. 2. The method of arranging a television signal according to claim 1, wherein each of the two systems of video signals is a composite color television signal similar to the existing television system. 3. One of the two systems of video signals is a composite color television signal similar to the current television system, and the other is a monochrome television signal similar to the current television system. A method for constructing a described television signal. 4. A horizontal scanning image signal having an aspect ratio of 16: 9, an aspect ratio of 16: 9, a scanning line number of 525, and a frame frequency of 1: 1 which is twice that of a current television system. 4. The television signal structuring method according to claim 1, wherein the television signal is an image signal obtained from a system. 5. A horizontally long image signal of progressive scanning having an aspect ratio of 16: 9, a scanning line number of 1125,
An image signal obtained from an image pickup system of 2: 1 interlaced scanning or 1: 1 progressive scanning is down-converted and subjected to scan conversion into a form of 525 scanning lines and 1: 1 progressive scanning. Claim 1, 2 or 3
5. A method for configuring a television signal according to any one of 1. 6. A horizontal scanning image signal having a horizontally long aspect ratio means that the frame frequency obtained from a solid-state image pickup device having an electronic shutter mechanism is the same as that of the current television system, the aspect ratio is 16: 9, and the number of scanning lines is 525. 4. A progressive scan image signal of a book is scan-converted into a progressive scan mode having a frame frequency twice that of the current television system by up-conversion processing. A method of constructing a described television signal.