JPH05300478A - Composing method for tv signal - Google Patents

Abstract

PURPOSE:To obtain the high quality and high definition TV signal of a specific system compatible with a present TV system, by performing image processings in studio equipments by a two-system video signal with a long sideways aspect ratio and restoring the processed two-system signal by demodulating the signal. CONSTITUTION:A two-system long sideways aspect ratio video signal where the aspect ratio generated directly in a wide aspect ratio photographing system 1 is 15:9, etc., is supplied and the image processings for the preparation of programs for reduction, elongation and rotation, etc., are performed in a studio equipment part 3. The two-system signal processed in this equipment part 3 is supplied, the demodulation processing of the two-system signal and the scanning conversions to scannings successively by the rearranging operation of the signal group of a two-system interlaced scanning are performed in an EVTV encoder part 4, and the signal is successively restored to the image signal group of the scanning form. The signal processing composing a TV system signal VO of s letter box system is performed for this image group and the TV signal of the letter box system with high quality and high definition which is compatible with a present TV system even when the image processing is performed is obtained.

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, in the present invention, two video signals in the form of interlaced scanning, which is the same as the current television system, are directly provided from an image pickup system 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 signals of the two systems that have undergone the image processing are demodulated to restore a horizontally-scanned progressive-scanning image signal having an aspect ratio, and the restored image signal constitutes a letterbox television signal. It is a thing.

[0008]

In the present invention, various image processing is performed in the studio equipment by the two-system video signals directly generated from the image pickup system having the horizontally long aspect ratio, and the image-processed two-system video signals are demodulated and sequentially scanned. To the image signal of the form. Therefore, the restored image signal becomes a signal that preserves high quality and high definition characteristics with high resolution. 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 section 1 has an aspect ratio of 16: 9 and a scanning line number of 525, as will be described later.
This is a two-row simultaneous independent reading type solid-state image sensor capable of simultaneously and independently reading out the signals of pixels corresponding to two scanning lines. It has two lines of 525 scanning lines and 2: 1 interlaced scanning. Image signals VP1 and VP2 of three primary colors are generated.

The encoder unit 2 performs the same encoding process as the current television system, and the number of scanning lines is 525.
The two-system composite color television signals VS1 and VS2 for the 2: 1 interlaced scanning 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 letterbox type television signal VO compatible with the current television system is produced.

Each block section in this embodiment will be described below. FIG. 2 is a schematic configuration diagram of an embodiment of the wide-aspect-ratio imaging unit 1 of the two-row simultaneous independent reading system,
For convenience of explanation, the structure of the G channel of the three primary colors is shown. This is an IT-CCD image pickup device having an aspect ratio of 16: 9 and is composed of an image pickup unit 11, a horizontal transfer unit 12, and an output unit 13.

The image pickup section 11 comprises a photodiode for photoelectric conversion and a vertical transfer CCD. The horizontal transfer unit 12 adopts a dual-channel horizontal CCD structure to realize 2-row simultaneous independent reading in which signals of pixels corresponding to two scanning lines are simultaneously and independently taken out for all vertical pixels. The output unit 13 adopts an interlaced switch structure as needed, and switches pixel signals corresponding to two scanning lines read from the respective horizontal CCDs of the horizontal transfer unit 12 for each field and has two systems. It is possible to obtain the image signal of the interlaced scanning.

FIG. 3 is a diagram for explaining how the image signals of these two systems of interlaced scanning are output. In the first field, the signal charges accumulated in the photodiode 11a are read out to the vertical CCD 11b and sequentially read out in the vertical CCD 1a.
1b is transferred to the first line (G ₁₁ , G ₁₂ , G ₁₃ ,
G ₁₄ ), 3rd line (G ₃₁ , G ₃₂ , G ₃₃ , G ₃₄ ), 5th line,
... are sequentially transferred to the horizontal CCD 12a and output terminal 13
output from a, the second line (G ₂₁ , G ₂₂ , G ₂₃ , G ₂₄ ),
4th line (G ₄₁ , G ₄₂ , G ₄₃ , G ₄₄ ), 6th line, ...
It is sequentially transferred to the horizontal CCD 12b and output from the output terminal 13b.

In the second field, similarly, the first line, the third line, the fifth line, ... Are sequentially arranged on the horizontal CCD 12a in the second line,
.. are sequentially transferred to the horizontal CCD 12b, but since the changeover switch 13c is switched for each field, the second, fourth, sixth, ..
a, the first line, the third line, the fifth line, ... Are output from the output terminal 13b, and two systems of interlaced scanning G channel image signals GP1 and GP2 are obtained. The wide-aspect-ratio imaging unit 1 of the two-row simultaneous independent reading system is not limited to the above-mentioned IT-CCD imaging device, and for example, the FI of the two-row simultaneous independent reading system.
A T-CCD image pickup device, a MOS type image pickup device, or the like can be applied.

FIG. 4 is a block diagram of an embodiment of the encoder section 2. The image signals VP1 and VP2 of three primary colors of interlaced scanning are sampled by the A / D converter 5 at, for example, four times the frequency of the color subcarrier f _SC of the current television system and converted into digital signals. ..

Then, the YIQ converter 6 converts the three primary color signals into luminance and color difference I and Q signals by a predetermined matrix calculation operation, and the luminance signals Y1 and Y2 and the color difference of the signal series of the two systems of interlaced scanning. Signals I1, Q1, I
Make 2, 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 to generate color signals C1, 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 synchronization 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.

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, and the number of scanning lines with 525 scanning lines having a frame frequency double that of the current television system. 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-sequential scanning 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.

The wide aspect ratio image pickup unit 1 has, for example, an aspect ratio of 16: 9 and a scanning line number of 52 as shown in FIG.
It is a solid-state image sensor of the two-row simultaneous independent readout system that can read out the signals of pixels corresponding to five lines and two scanning lines simultaneously and independently. It has two lines of 525 scanning lines and 2: 1 interlaced scanning. Image signals VP1 and VP2 of the three primary colors are generated.

The encoder units 60 and 60 'perform the same encoding processing as in the current television system, and the composite color television signal VS1 and the monochrome television signal YS2 of 525 scanning lines and 2: 1 interlaced scanning.
To generate.

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 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. A television signal VO having a letter box system is generated.

FIG. 18 is a block diagram of an embodiment of the encoder units 60 and 60 'in this embodiment.

Image signal VP of three primary colors of interlaced scanning
1, 1 and VP2 are sampled by the A / D converter 5 at a frequency four times as high as the color subcarrier f _SC of the current television system, and converted into digital signals.

Then, the YIQ converters 6 and 7 convert 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 Y1 and the color difference of the signal series of the two systems of interlaced scanning. The signals I1 and Q1 and the luminance signal Y2 are produced.

The color modulator 8 quadrature amplitude modulates the color difference signals I1 and Q1 with the color subcarrier f _SC to generate 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 black and white television signal YS2.

FIG. 19 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 subjected to image processing in the studio equipment section are, for example, the color subcarrier f in the A / D conversion section 14.
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 three-dimensional motion adaptive brightness / color signal separation of horizontal / vertical / time to obtain a 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. 20 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.

It should be noted that, according to 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 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 superimposed.

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.

[0074]

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 an encoder unit according to a second embodiment of the present invention.

FIG. 19 is a block configuration diagram of an EDTV encoder unit.

FIG. 20 is an example of an interpolation scanning line generation unit.

[Explanation of symbols]

1 ... Wide aspect ratio imaging unit, 2 ... Encoder unit, 3
… Studio equipment, 4… EDTV encoder, 5… A
/ D converter, 6, 7 ... YIQ converter, 8 ... Color modulator, 9
... Multiplexing unit, 10 ... D / A conversion unit, 11 ... Imaging unit, 12 ...
Horizontal transfer unit, 13 ... Output unit, 14 ... A / D conversion unit, 15
... YC separation unit, 16 ... 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 unit, 22 ... Auxiliary signal modulation unit, 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 ... Addition circuit, 32 ... Memory circuit, 33
... control circuit, 34 ... memory circuit, 35 ... control circuit, 3
6, 37, 38 ... LPF circuit, 39 ... Color signal modulation circuit,
40 ... Adder circuit, 41 ... 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 ...
Sample point thinning-out circuit 54 ... Time axis compression circuit 55 ... Time series conversion circuit 56 ... DVP device 57 ... Control unit 60 ...
Encoder section, 61 ... EDTV encoder section, 62 ... Delay circuit, 63 ... Interpolation scanning line generation section, 64 ... 1H delay circuit, 65 ... Coefficient addition circuit, 66 ... Addition circuit.

Claims (4)

[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 types of video signals in the form of interlaced scanning similar to the current television system directly from an image pickup system with various aspect ratios, and various image processing in studio equipment for the above two types of video signals. By providing means for generating two-system video signals of the same processed image by performing the operations in synchronization and demodulating the two-system video signals of the processed image, a progressive scanning image signal sequence having a horizontally long aspect ratio is used. A method of constructing a television signal, comprising constructing a letterbox television signal. 2. The method of constructing 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. A composite color television signal similar to the current television system, one of the two systems of video signals, and a black and white television signal similar to the current television system, the other one. A method of constructing a described television signal. 4. An image pickup system having a horizontally long aspect ratio is a solid-state image pickup device having an aspect ratio of 16: 9 and 525 scanning lines, and a signal of a pixel corresponding to two scanning lines.
4. The method according to claim 1, wherein the image signals are read out simultaneously and independently in the form of 5 lines and 2: 1 interlaced scans to generate image signals of two systems similar to the current television system. A method for constructing a television signal according to claim 1.