JPH01253378A - Television signal transmission system - Google Patents

Abstract

PURPOSE:To prevent crosstalks and mutual interference between television signals of center part and side panel parts by separating the side panel sections having aspect ratios larger than a prescribed standard from the center part and transmitting the picture of the center part through a conventional transmission line and pictures of the side panel parts through an additional transmission band after performing time expansion. CONSTITUTION:The clock frequency of signals of the center part is converted into, for example, 8fSC by a buffer memory 8 and the signals become main transmitting signals. Signals of side panel parts are expanded in time to double by means of 1:2 D/D converter 7 and converted into signals of the frequency 8fSC by a buffer memory 9 similarly to the main transmitting signals. The output of the buffer memory 9 is time division multiplexed with additional signals which are similarly clock-converted by a buffer memory 10 at a switch 11. The output of the switch 11 becomes additional transmitting signals. Therefore, the center part of pictures can be transmitted while the compatibility can be maintained with conventional receivers and connected parts produced in reproduced pictures can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is applicable to so-called ATV (Advanced TV).
) or ADTV (8 advanced Defini
The present invention relates to a television signal transmission system that can be applied to TVs, and particularly relates to a television signal transmission system that separates and transmits side panel portions.

[Summary of the invention]

The present invention separates the side panel portion of a television signal with an aspect ratio of 16:9 from the center portion, transmits the image of the center portion through a conventional transmission path, and transmits the image of the side panel portion as an additional signal after time expansion. By time-division multiplexing and transmitting in an additional transmission band, the center image transmits a television signal with an aspect ratio of 16:9 while maintaining compatibility with conventional transmission signals and receivers.

[Conventional technology]

Although no prior art directly related to the present invention is found, a similar technology is so-called 〇TV (＾advancedCo
mcompatible Te1eVision) is known. The principle system diagram of this ACTV is as shown in Fig. 13, and the system outline is as shown in the following table.

[Problem to be solved by the invention]

However, in the ACTV described above, even if a dedicated receiver is used, crosstalk may occur between the center section and the side panel sections.

Furthermore, when a conventional receiver is used, there is a possibility that signals from the side panel portions may be seen as interference with signals from the center portion.

SUMMARY OF THE INVENTION In view of the above-mentioned points, an object of the present invention is to provide a television signal transmission system configured so that signals from the side panel portion and signals from the center portion can be reproduced without causing crosstalk or mutual interference.

[Means to solve the problem]

In the television signal transmission system according to the present invention, a television signal displaying a horizontal image having a larger aspect ratio than a television signal of a predetermined standard is transmitted to a central portion of the image having a predetermined aspect ratio and a portion other than a center portion image having a predetermined aspect ratio. The main transmission signal is formed from the center part signal and transmitted through a predetermined transmission path or transmission band, and the side panel part signal is time-expanded and combined with other additional signals. An additional transmission signal is formed by time division multiplexing, and the signal is transmitted through an additional transmission path or an additional transmission band.

Further, the additional transmission signal can be amplitude-modulated and multiplexed into a frequency band higher than the audio carrier of the predetermined transmission signal, so that the main transmission signal and the additional transmission signal can be transmitted in a continuous band on the same transmission path.

It is also possible to cut out and transmit the center part and side panel part so that they partially overlap on the screen, and then on the receiving side cut off the overlapping part and then join the center part and the side panel part.

At the joint between the center portion and the side panel portions that include overlapping portions, it is also preferable that the center portion and the side panel portions be weighted and added together on the receiving side.

Furthermore, high-frequency components related to the vertical spatial frequency of the luminance signal of the original image are time-compressed and multiplexed as part or all of the additional signal, and on the receiving side, the signal is separated and time-expanded, then scan-converted, and the signal is scan-converted on the receiver side. It is also possible to add a signal to the luminance signal output only in the case of a moving image.

(Operation) In the present invention, the center portion of the image is transmitted through a conventional transmission path while maintaining compatibility with conventional signals and conventional receivers, and the side panel portion is transmitted through an additional transmission path. This prevents crosstalk between the center section and side panel sections.

Further, when the joint between the center portion and the side panel portion is easily visible in the reproduced image, claims 2 to 4 of the present invention may be implemented. Furthermore, in order to improve the dynamic resolution of the reproduced image by utilizing the gap between the additional transmission signals,
What is necessary is to implement claim 5 of the present invention.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the invention. In Kiguchi, the human signal is a high-definition signal with a scanning line count of 1125 and an aspect ratio of 16:9, and an additional signal unrelated to this high-definition signal. The output signals are a main transmission signal and another additional transmission signal compatible with an NTSC system with a 4:3 aspect ratio and 525 scanning lines.

The high-definition signal is given by ycc (ji degree signal and two color difference signals), and its clock frequency is 7
Assume that the frequency is 4.25 MHz, that is, the number of samples per line (scanning line) is 2200 pel/1ine (pel is a pixel, 1ine is a scanning line). scan line 1125
The wooden high-definition signal is converted into a YCC video signal with 525 scanning lines by a 15 near scanning line converter 1, and is input to the encoder 2 according to this embodiment. The .15 near scan converter 1 can be realized using known techniques.

The input signal of the encoder 2 is first converted into a composite video signal by the YC encoder 3 using exactly the same means as NTSC. This YC encoder 3 has all the frequency specifications of the NTSC encoder, for example 220071820 = 110
This can be achieved by multiplying /91 inches by 1.21 times. For example, NTSC
In this method, the cutoff frequency is 1.5Mtlz! As a signal band-limiting filter, YC encoder 3 uses 1.5 x
A filter of 1.21 to 1.8 MHz may be used. If the VC encoder 3 is composed of a digital circuit, this can be realized by increasing only the clock frequency and the delay amount of the delay line by 1.21 times that of the NTSC system, while leaving the circuit unchanged.

The output of YC encoder 3 is 5.1M1 (z Noshi PF
Bandwidth is limited by (low-pass filter) 4. This 5.1MH
z is 4.2MHzX 1.214 for the 4.2MHz band of the NTSC transmission line, similar to YC encoder 3.
5.1M) The frequency is determined from Iz, so the composite video signal output from the YC encoder 3 is NTSC.
is limited to a transmission band equivalent to

The output of LPF4 is connected to switch 5. It is led to switch 6.

Switch 5 is turned on only in the center of the image.
The switch 6 is a switch that is turned on only in the side panel portion of the image. The clock frequency of the center part signal, which is the output of the switch 5, is converted in the buffer memory 8, for example, clock frequency = 8fsc (fsc is NTS
The frequency of the color subcarrier wave of C) becomes the main transmission signal. The buffer memory 8 simply adjusts the reading position of the written signal and reads it out using a clock of 8 fsc. This signal has 1820 samples.
This is a pel/1ine signal.

The signal of the sight panel part which is the output of switch 6 is 1
: 21) The time is expanded twice by the /D converter 7, and the clock frequency is set to 8f in the buffer memory 9 like the main transmission signal.
It is converted into an SC signal. The output of the buffer memory 9 is
It is time-division multiplexed at switch 11 with an additional signal whose clock is similarly converted to 8 fsc in buffer memory IO. The output of this switch 11 becomes an additional transmission signal. The required bandwidth of the additional transmission signal is 4. for video signals.
272 = 2.1MHz.

FIG. 2 shows an embodiment of the receiving side according to the present invention. When the main transmission signal is input to the decoder 21, it is first converted into a signal with a sample count of 2200 pel/1ine in the buffer memory 23 by an action opposite to that of the buffer memory 8 on the transmitting side.

The additional transmission signal is also separated into the video signal of the side panel portion and the additional signal by the switch 22, and the buffer memories 24 and 25 respectively transmit the signal at 2200 pel/l in the same manner as above.
It is converted to an ine signal.

The video signal of the side panel portion, which is the output of the buffer memory 24, is time-compressed by the 2:ID D/D converter 26 and returned to its original size, and is transferred to the buffer memory 2 by the switch 27.
The main transmission signal, which is the output of No. 3, is connected to the video signal of the center portion. The spliced signal is sent to YC decoder 2
8 to a YCC component signal,
A wide aspect video signal with an aspect ratio of 16:9 is output. This YC decoder 28 can be realized by conventional means like the YC encoder 10 on the transmitting side.

FIG. 3 is an example of a signal construction method according to the present invention. This figure (
The high-definition signal in a) has 1125 scanning lines, 2 pixels, and 2200 pel/1ine, but its effective portion is 1
035 tree, 1920 pel/1ine. The aspect ratio of the effective part is 16:9, but this side is divided into side panel parts (left) and R (right), which correspond to a ratio of 1.5, and a center part, which corresponds to a ratio of 13. do. Then, the number of pixels for each panel becomes 180 pels for the R side panel and 1560 pels for the center panel. The transmitter shown in Figure 1 transmits high-definition signals to 1
5; Convert the scanning line to 7 and reduce the number of scanning lines to 525 trees, effective 483
After making it into a book, the 1560 pels in the center part are shown in Figure 3 (
b) It is transmitted as the main transmission signal. This allows N.T.
Although the horizontal blanking rate is smaller than that of the SC signal, there is still a horizontal blanking of 9.1 μSeC, so there is no problem with compatibility with NTSC receivers.

If this main transmission signal is received by a conventional NTSC receiver,
Same aspect ratio as NTSC 4:3. Effective scanning line 483
Tree images can be played. In order to compress the additional signal band to 3 MHz or less, the signals of the L and R side panel portions are time-expanded by, for example, twice, resulting in a signal of 360 pels each. When the horizontal blanking rates of the additional transmission signal and the main transmission signal are made the same, the time corresponding to 1560-360 x 2 =840 pels becomes an empty part of the signal, so it is not necessarily related to this video signal. For example, additional signals such as digital audio signals can be time-division multiplexed and used. The additional transmission signal in this case is as shown in FIG. 3(c). In addition, Figures 1 and 2
The switches 5, 6.1+, and 22.27 in the figure each operate to satisfy the conditions shown in FIG.

FIG. 4 shows another embodiment of the transmitting side to which the present invention is applied, and FIG. 5 shows a corresponding embodiment of the receiving side.

In Figure 4, 525 scanning lines, aspect ratio +6:
9. The video signal input and additional signal input to Y(:
The signal is encoded into a main transmission signal and an additional transmission signal by the same encoder 2 as shown in the figure. The additional transmission signal is fsc (NT
It is modulated in the modulator 31 with a carrier having twice the frequency of the SC color subcarrier liquid, 5.06~7, 16MH
The band is limited by a BPF (band pass filter) 32 of :l. Since the output of this BPF 32 is almost only the lower sideband of the output of the modulator 31, it is doubled in a coefficient multiplier 33 to match the level with the main transmission signal, and then added to the main transmission signal in an adder 34.

The output of the adder 34 is modulated into a high frequency by a VSB-AM modulator 35 using fv as a video carrier in exactly the same manner as in NTSC. This VSB-AM modulator 35 is
Increased the RF band of conventional NTSC equipment from 6MHz to 9M
Just change it to Hz.

The audio signal is modulated in the FM modulator 37 using fA as the audio carrier in exactly the same manner as in NTSC.

The output of the M modulator 37 is added to the FM modulator 35 and VSB- by an adder 36 to obtain a transmission signal.

In FIG. 5 on the receiving side, the audio notch filter 41 and the audio BP
F48 performs pleasant sound separation of the transmission signal.

The output of BPF4B is the exact same FM demodulator 49 as NTSC.
It is demodulated to baseband and output as an audio signal. The video signal output from the notch filter 41 is demodulated to baseband by a VSB-AM demodulator 42. The VSB-AM demodulator 42 only needs to change the RF range of the conventional device from 8 M tl z to 9 M) Iz.

The output of the VSB-AM demodulator 42 is a 4.5MHz LP
F43 and 4.5-8MHz BPF44 generate 4.5MHz, which is the frequency equivalent to the baseband of audio carrier fA.
The main transmission signal is separated into a main transmission signal whose frequency is less than that, and a modulated additional transmission signal whose frequency is higher than that. The output of the LPF 44 is demodulated by a demodulator 45 using a carrier with twice the fsc synchronized with the transmitting side, and after unnecessary high-frequency components are cut by a 3MHz LPF 46, it is doubled by a coefficient multiplier 47 and becomes an additional transmission signal. Become.

The main transmission signal and additional transmission signal are sent to the same decoder 21 as in Fig. 2.
The signal is decoded into a YCC video signal and an additional signal and output.

FIG. 6 shows the spectrum of the signal transmitted by the circuit of FIG. 4. In this figure, the frequency of fv is normalized to zero and displayed. -1.25MHz to 4.5MHz fV and the main transmission signal, 4.5M)lz fA and the sideband of the nearby audio are exactly the same signals as the NTSC signal, and in conventional receivers, the IF stage is usually Since the band is limited to 4.5 M) lz or less, even if a wooden sword transmission signal is received, the same video and audio as before can be reproduced, and there is no problem with compatibility.

The additional transmission signal is 5.06~7.16MHz as shown in this figure.
It is distributed in The DC component of the signal in the side panel portion corresponds to 2fsc"v 7.16M)Iz in the modulated signal, but as shown in Figure 4, the DC component of the signal in the side panel part corresponds to 2fsc"v 7.16M) Iz to achieve point-symmetrical characteristics with 7.16MHx as the center. 5.06~7
．． By setting the characteristics of the 16M11ZBPF32, the side panel signal can also be transmitted with a flat single frequency characteristic.

The transmission band of this transmission signal is 9h in RF as shown in Figure 6.
It becomes lHz. Further, the transmission band of the additional signal is 0 to 2.1 M)Iz in the baseband. According to the Bokuto method, additional transmission signals can be transmitted in a continuous RF band of 9 MHz with minimal changes to the RF portion of conventional equipment for both transmission and reception.

When the main transmission signal and the additional transmission signal are transmitted in continuous bands on the same transmission path, both are affected by distortion and noise in the transmission path in the same way. This can reduce the inconvenience that the seam between the center part and the side panel part is visible. Furthermore, by setting the carrier frequency that modulates the additional transmission signal to have a simple frequency relationship with the color subcarrier, phase synchronization on the receiving side becomes easy. In Fig. 4 and Fig. 5, this carrier frequency is set to 2fc, but for example, 10/7fS
Even with C45, IMHz, a transmission signal with a spectrum similar to that shown in FIG. 6 can be obtained.

FIG. 7 shows another embodiment (claim 3) to which the present invention is applied.
This example shows an example of a signal construction method (see Section 1). Comparing the main transmission signal of FIG. 3(b) and the main transmission signal of FIG. 7(a), the latter transmits an extra 12 pixels on each side of the center portion. These 24 pixels in total will be transmitted to the side panel portion overlappingly with the additional transmission signal. Even with this method, the horizontal blanking of the signal is 8.
Only 2 μsec remains, and approximately 7.9 μsec, which is the period from the horizontal synchronizing pulse of the NTSC signal to the color burst, remains as is, so there is no problem in compatibility with the NTSC receiver.

Similarly, the image of the side panel part in the additional transmission signal is also 2
The center portion of each four pixels is transmitted in duplicate. After doing this, on the receiving side, the overlapping portion is cut off on both the center and sides, and then the center and sides are joined by a switch 27 shown in the second figure.

This embodiment has exactly the same configuration as in FIGS. 1 and 2, with switch 5. 6.11.22.27 and buffer memory 8
~10. This can be achieved by slightly changing the operation timings of steps 23-25. By cutting off the overlapping parts in this way, even if ringing occurs due to the band limit of the transmission line at the junction of the side panel signal and the additional signal in the additional transmission signal, as shown in Figure 8, for example, the main part of the ringing can be cut off. Since it can be joined to the center part from the front, the seam between the center and side panels can be made inconspicuous. Similar effects can be expected for both left and right ends of the main transmission signal, which is the signal in the center portion.

FIG. 9 shows the configuration of the receiving side, which is an embodiment of the invention (see claim 4). The difference between the decoder 51 in this figure and the decoder 21 in FIG. 2 is that the buffer memories 23 and 2
: The output of the I D/D converter 26 is passed through the α coefficient multiplier 52 instead of the switch 27. (1-α) Coefficient unit 53° Adder 5
In 4, weighting is performed by addition. The operation of other parts is the same as that in FIG.

The weights α and 1−α are set as shown in FIG. 10, for example. The horizontal axis in Fig. 10 indicates the 1920 pixels of the effective scanning portion in the horizontal direction of the original signal with an aspect ratio of 16:9.
19 addresses are attached, and the vertical axis of the figure is the weight. The coefficient α is the weight for the center part, and the weight is % at addresses 185 and 1733, which are the ends of the original center part, and has a transition area of ±6 around those points, and addresses occupying most of the center part. 191~
At 1727, it becomes α#1. The weight for the side panel portion is determined by α as 1−α, and the sum of the center portion and the side panel portion is always 1.

When the circuits shown in FIGS. 9 and 10 receive the signals shown in FIG. 7, for example, the main transmission signal shown in FIG. 7(a) transmits addresses 168 to 1751, After cutting off 6 pixels on each side of the center signal, the 12 pixels adjacent to this are successively weighted, added and mixed with the side panel signal. By doing this, the center part and the side panel part gradually alternate, so in addition to improving the joint by ringing (see claim 3), when noise is added on the transmission path, the main transmission noise is It is possible to reduce the image seam effect caused by noise components caused by different influences on the signal and the additional transmission signal.

FIG. 11 shows another embodiment of the present invention (see claim 5).
shows. In this figure, the transmitting side and the receiving side are shown in the same diagram, and the representation of the transmission path is omitted. In this figure, y,
The high-definition signals of c, , c2 are 1 as in Figure 1.
The 5=7 scanning line converter 1 converts the Y (luminance) signal into a signal with 525 scanning lines, but the Y (luminance) signal is also input to the high frequency component scanning line converter 61 at the same time, and the video high frequency component in the Y signal is converted into a signal with 525 scanning lines. Only scan lines are converted.

The internal configuration and operation of the high-frequency component scanning line converter 61 are as follows.
5 is similar to near scan line converter 1, and the conversion ratio is also that of converter l.
<15+7, but as described later, only the characteristics (conversion characteristics) of the interpolation filter differ from the 15 near scanning line converter 1.

The output of the scanning line converter 61 is 3: I D/D converter 6
2, the signal is time-compressed at the end, and time-division multiplexed with another independent data signal at switch 63 to become an additional signal. Here, if the transmission band of the additional signal is, for example, 2.1 MHz, the transmission band of the high frequency component is 2.1/3 = 0.7 MHz. 3: The number of pixels of the output of the ID/D converter 62 is 192.
0/3=[140 pel/1ine, and if the configuration of FIG. 7 is applied as a transmission signal, 81B-640=176 pel/1ine can be transmitted as an independent data signal.

The YCC video signal output from the scanning line converter 1 and the additional signal output from the switch 63 are encoded into a main transmission signal and an additional transmission signal by the encoder 2 shown in FIG. On the receiving side, after decoding these into a YCC video signal and an additional signal by the decoder 21 in FIG. 2, the additional signal is sent to a switch 65.
The signal is separated into independent data No. 8 and a high frequency component signal.

The high frequency component signal is restored to its original size by a 1:3 D/D converter 66. In order to improve the reproduced image quality, the YCC video signal output from the decoder 21 is scan-converted to, for example, 525-tree sequential scanning and displayed on a monitor.

In the circuit shown in FIG. 11, this is done by a progressive scan converter 64. This converter 64 can be realized using known technology, and typically performs motion-adaptive signal processing. 1=3 The output of the D/D converter 66 is similarly converted into sequential scanning by the high frequency component converter 67. The high-frequency component converter 67 is similar in structure and operation to the progressive scan converter 64, except for its conversion characteristics. However, the motion signal for motion adaptive processing is supplied from a progressive scan converter 64.

For the C, , C2 color difference signals, the output of the progressive scan converter 64 becomes the output signal of the receiver as is, but for the Y signal, the Y signal output of the progressive scan converter 64 and the high frequency component converter 67 are used.
An adder 68 adds the outputs of the signals to obtain an output signal of the receiver.

Figure 12 shows the scan converter 1, 61.64.6 of Figure 11.
7 shows an example of the characteristics (conversion characteristics) of the interpolation filter used. In the figure, the horizontal axis is time frequency f (Hx)
, the vertical axis is the vertical spatial frequency ν (cycles). Scanning converters 1 and 64 are commonly used converters, but since the scanning of the transmission path is a field frequency of 6011z and 525 scanning lines and 2:1 interlacing, in the case of still images, double converter 1 is used. , 64, ν is up to 525/2 cycles,
f transmits up to 15H2, and for video, V is 525/4
A characteristic is used such that f transmits up to 30'Hz up to a cycle. These double degree converters 1.64 use these characteristics by adapting them to the motion by detecting the motion of the image.

These characteristics are sufficient for the still image shown in Figure 12(a), but in the case of the moving image shown in Figure 12(b), ν is limited to 525/4 cycles to prevent aliasing due to interlacing, and the image The spatial resolution decreases when the object moves.

To prevent this, the vertical high-frequency components of the moving image shown by the dotted line in FIG. 12(b) may be transmitted as a separate signal. The converter 61.6 in Fig. 11 performs scan conversion of the component indicated by the dotted line.
7, and the circuit configurations of these are exactly the same as those of 1.64, and it is only necessary to change the conversion characteristics for moving images so that the area indicated by the dotted line in FIG. 12(b) becomes a pass band.

The high-frequency component scan converter 61 does not need to perform motion adaptive processing, and may always perform scan line conversion using characteristics for moving images. Regarding the converter 67, if a coefficient of zero is set as a characteristic for still images, only when the image has a motion component, it will scan convert with the above characteristics and output a signal, and if it is a still image, it will output nothing. do not. Therefore, the adder 68 adds the vertical high frequency component to the Y signal only when there is a motion component in the image. However, the horizontal spatial frequency band of the vertical high frequency component is, for example, 0.7 MHz, as explained in FIG. 11.

11 and 12, the video vertical resolution of the reproduced image is improved.

The present invention can be realized with circuit configurations other than those described above.

Further, although the input signal and the main transmission signal are assumed to be a high-definition signal and an NTSC signal, respectively, the present invention is not limited to this, and the present invention can be implemented so as to maintain compatibility with, for example, PAL, SECAM, etc. signals as the main transmission signal.

Furthermore, the YC encoder 3 of FIGS. 1 and 2, YC
The decoder 28 is not an NTSC encoder or decoder, but is, for example, an NTSC compatible EDT.
It may be an encoder or decoder for V or enhanced TV.

〔Effect of the invention〕

By implementing the present invention, it is possible to transmit a television signal with a wider aspect ratio than before, together with additional information such as digital audio, and the center part of the image can be transmitted while maintaining compatibility with conventional receivers. Can be transmitted. Additionally, the required hardware is relatively simple.

According to an embodiment of the present invention, it is possible to improve seams that occur in reproduced images (see claims 2 to 4). Furthermore, it is also possible to improve the video resolution of the reproduced image (see item 5 of the mW requirement).

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a receiving side embodiment of the present invention, FIG. 3 is a diagram showing an example of a signal configuration according to the present invention, and FIG. 4 is a diagram showing an example of the structure of a signal according to the present invention. FIG. 5 is a diagram showing a receiving side embodiment according to the present invention. FIG. 6 is a diagram showing an example of a transmission signal spectrum according to the present invention. FIG. 7 is a diagram showing an example of a transmission signal spectrum according to the present invention. 8 is a diagram showing an example of ringing during transmission, FIG. 9 is a diagram showing another embodiment of the present invention, and FIG. 10 is an example of characteristics used in the circuit of FIG. 9. FIG. 11 is a diagram showing another embodiment of the present invention, FIG. 12 is a diagram showing an example of the characteristics of the circuit of FIG. 11, and FIG. 13 is a diagram showing a conventional technique. 1...15 near scanning line converter, 2...encoder, 3...YC encoder, 4...LPF. 5.6-...Switch, 7...1: 2D/D converter, 8.9.10... Buffer memory, 11... Switch, 21... Decoder, 22... Switch, 23 , 24.25...Buffer memory, 26...2
: ID/D converter, 27... switch, 28... YC decoder, 31... modulator, 32... BPF. 33... Coefficient unit, 34... Adder, 35 ・'VSB-AM transformer, 36...
Adder, 37... FM modulator, 41... Notch filter, 42... VSB-AM demodulator, 43... LPF. 44...BPF. 45... Demodulator, 46... LPF, . 47...Coefficient unit, 48...BPF. 49...FM demodulator, 51...Decoder, 52...α coefficient unit, 53...(1-α) coefficient unit, 54...Adder, 61...Scanning of high frequency components Line converter, 62...3: ID/D converter, 63...Switch, 64...Sequential scan converter, 65...Switch, 66...1:3 [+/D conversion 67... High frequency component converter, 68... Adder. Patent applicant Japan Broadcasting Association agent
Patent Attorney Yoshi Tani - The Great Eight τr Yabe -!・Figure 3, Figure 6, Figure 8, Figure 7 ← Figure 12

Claims (1)

[Claims] 1) A television signal that displays a horizontal image with a larger aspect ratio than a television signal of a predetermined standard is divided into an image of a center portion having a predetermined aspect ratio and a side image other than the center portion. The main transmission signal is formed from the signal of the center part and transmitted through a predetermined transmission path or transmission band, and the signal of the side panel part is time-expanded and combined with other additional signals. A television signal transmission system characterized by forming an additional transmission signal by time division multiplexing and transmitting the signal through an additional transmission path or an additional transmission band. 2) A claim characterized in that the additional transmission signal is amplitude modulated and multiplexed in a frequency band higher than the audio carrier of the predetermined transmission signal, and the main transmission signal and the additional transmission signal are transmitted in a continuous band on the same transmission path. The television signal transmission system according to item 1. 3) Cut out and transmit the center part and the side panel part so that they partially overlap on the screen, and on the receiving side cut off the overlap part and then join the center part and the side panel part. The television signal transmission system according to claim 1, characterized in that: 4) The television set according to claim 3, wherein at the joint portion between the center portion and the side panel portion including the overlapping portion, the center portion and the side panel portion are each weighted and added on the receiving side. John signal transmission method. 5) As part or all of the additional signal, the high-frequency component of the vertical spatial frequency of the luminance signal of the original image is time-compressed and multiplexed, and on the receiving side, the signal is separated and time-expanded, then scan-converted, and then sent to the receiver. 2. The television signal transmission system according to claim 1, wherein the signal is added to the luminance signal output from the side only in the case of a moving image.