JPH01253381A - System for scanning, converting, and transmitting television signal - Google Patents

Abstract

PURPOSE:To improve the decline in vertical resolution produced when signals having a large aspect ratio are transmitted through the conventional transmission line by a top-bottom black system by transmitting signals obtained by performing scan- conversion on the vertical high-frequency components of an original picture during a vertical blanking period which is extended than before by the scan conversion in a multiplexed state after performing time compression. CONSTITUTION:High vision signals of 1035 effective scanning lines are line-converted to signals of 525 scanning lines (388 effective scanning lines) at the 8:3 line converters 1, 3, and 4 of a line converter 10 on the transmitting side and inputted to an NTSC encoder 5. The encoder 5 encodes Y-, C1, and C2-component signals into composite video signals. On the other hand, high-vision Y-signals are also inputted to a 8:3 line converter 2 for high-band component and high-band components related to a vertical spatial frequency are 8:3 line-converted into high-band transmitting signals YVH of 525 scanning line (388 effective scanning lines). The signals YVH are time-compressed to the 1/4 picture element number at a D/D converter 6 and their effective scanning lines are reduced to 97 lines. Then the signals YVH are moved to the vertical blanking position of the signals converted by the line converters 1, 3, and 4.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to ATV (8 advanced TV) or 80 TV (80 advanced Definition TV).
), which relates to a television signal scanning conversion transmission system suitable for
In particular, it relates to a method for transmitting signals with an aspect ratio of 16:9 while maintaining compatibility with NTSC receivers.

(Summary of the Invention) The present invention scans the effective scanning lines of a television signal having a larger aspect ratio and a larger number of scanning lines than a conventional television signal into fewer effective scanning lines than the effective scanning lines of a conventional television signal. In a system that transmits a television signal with a large aspect ratio while maintaining compatibility with conventional receivers by converting and transmitting it, the vertical blanking period of the original image is By time-compressing and multiplexing a signal obtained by scan-converting the high frequency component, the vertical resolution of the reproduced image by the above method is improved.

[Conventional technology]

Japanese Patent Application No. 134125/1983 describes a system for transmitting additional information using gaps in the spatio-temporal spectrum of NTSC signals.
No. ``Color Television Signal Transmission System'' is known. This method is commonly known as PAF (Phase Alterna
It is called tIng Field).

[Problem to be solved by the invention]

However, when attempting to transmit high-frequency transmission signals using the above-mentioned PAF technology, although it is effective for still images, it is hardly applicable to moving images.

In addition, it is possible to convert a high-definition signal with an aspect ratio of 16:9 to a scanning line that is less than the effective number of scanning lines of a conventional signal, such as NT.
In a method in which the SC's 483 lines are scan-converted into 388 effective scan lines and transmitted through a conventional transmission line (hereinafter this method is collectively referred to as the upper and lower lid method), the vertical resolution is reduced due to scan conversion. As a method for reinforcing this, there is an "image transmission system" to be filed at the same time as this application.

Furthermore, as a method for transmitting wideband television signals in a continuous band while maintaining compatibility with conventional signals in both video and audio, there is a "television signal transmission method and its receiving device" to be filed at the same time as this application. .

However, although the transmission signal of the vertical wide area component by the above-mentioned "image transmission system" is effective for still images, it is not very effective for moving images. This is particularly noticeable when the PAF technique is used to transmit high frequency transmission signals.

SUMMARY OF THE INVENTION In view of the above-mentioned points, an object of the present invention is to provide a television signal scan conversion transmission system that improves the vertical resolution of reproduced images for both still images and moving images.

[Means to solve the problem]

In the present invention, the effective scanning lines of a television signal having a larger aspect ratio and a larger number of scanning lines than a predetermined television signal are scan-converted into a fewer number of effective scanning lines than the effective scanning lines of the predetermined television signal, and then transmitted. In a method of transmitting a television signal with a larger aspect ratio while maintaining compatibility with a given receiver by
During the vertical blanking period of the scan-converted television signal, a high-frequency transmission signal obtained by scan-converting the vertical high-frequency components of the original image is time-compressed, multiplexed, and transmitted.

[Effect]

The present invention improves the vertical resolution of the reproduced image by the method by time-compressing and multiplexing a signal obtained by scan-converting the vertical high-frequency components of the original image during the vertical blanking period, which is wider than before due to the scan conversion. It is something that improves.

〔Example〕

Hereinafter, the present invention will be described in detail based on Examples.

The input of the circuit shown in FIG. 1 is a high-definition signal of 1125 scanning lines and 1035 effective scanning lines of Y (luminance) and C1, C2 (color difference), and the output of this circuit is 525 scanline tree, compatible with NTSC signals
This is a transmission signal of 388 effective scanning lines.

Both high-definition signals and transmission signals have a field frequency of 6
Assume that the scanning is 0 Hz, 2:1 interlaced scanning.

When the Y, CI, and C2 high-definition signals are input to the transmitting line converter lO, the 1035 effective scanning lines are converted to 8:3 line converters 1 and 3.4, respectively, which converts the signals into 525 and 388 effective scanning lines. Line (scanning line) converted to NTSC
It is input to the encoder 5. These line converters 1, 3
．． 4 can be realized by a known technique, and usually includes a motion detection section and performs motion adaptive processing in order to improve the converted image quality.

Y in the NTSC encoder 5 by normal means.

The component signals of C, , C2 are encoded into a composite video signal. On the other hand, the high-definition Y signal is also input to the 8:3 line converter 2 for high-frequency components, and the high-frequency components regarding the vertical spatial frequency are subjected to 8:3 line conversion in the same way as the processing in the line converter 1.3.4. The signal is converted into a high frequency transmission signal (YV-H) with 525 scanning lines and 388 effective scanning lines. However, the motion signal necessary for this conversion is transmitted to the Y converter 1.
Supplied by

The motion signal is a signal indicating the magnitude of the moving image component in the image.
The time is compressed to 4 pixels. This signal is packed into one line from four lines of pixels in the buffer memory 7, resulting in 97 effective scanning lines, and these 97 lines are transferred to the line converter 1,
3. Move to the vertical blanking position of the signal converted in 4.

The level converter 8 performs level conversion such as level compression and setup adjustment so that this signal is not noticeable in a conventional NTSC receiver. The output of the level converter 8 becomes a multiplex signal for multiplexing yvo in the vertical blanking period.

The switch 9 switches between the composite video signal of the low-frequency component regarding the vertical spatial frequency, which is the output of the NTSC encoder 5, and the above-mentioned multiplexed signal to produce a transmission signal.

The switch 9 selects the multiplexed signal during the vertical blanking period (VBL period), and selects the composite video signal output from the NTSC encoder 5 during the 388 effective period (VBLK period). This results in 388+ of 525 scan lines
The 97-485 lines are the scanning lines for transmitting the video signal, and the remaining 40 lines are the vertical blanking periods that can be used for other purposes such as text broadcasting in the transmission signal shown in the first diagram.

FIG. 3 shows an example of an image when the transmission signal of FIG. 1 is displayed on a conventional NTSC receiver. The transmission signal becomes scanning line 5 if blanking is included as shown in the dotted line (A) in Figure 3.
It has 25 lines and a horizontal area of 63.6 μsec. The standard NTSC signal is a signal having an effective scanning period of 483 scans and 52.7 μSec horizontally, as shown by the solid line (b) in FIG. On the other hand, the transmission signal in Figure 1 is
When the center of the screen is aligned with the standard NTSC signal, there are 388 scanning lines, horizontally 55.5 μsec, as shown by the solid line (C) in Figure 3.
The signal has an effective scanning period of . This signal leaves 8.1μsec of blurring in the horizontal direction,
Since the period of horizontal synchronization pulse and color burst in NTSC is approximately 7.9 μsec, this signal is
There is no problem with synchronization when receiving it on a receiver, and only the sides of the screen protrude slightly from the top of the CRT. In the vertical direction, the multiplexed signal in Figure 1 included in the diagonally shaded area (d) in Figure 3 is visible, but it can be made considerably less noticeable by appropriately adjusting the level of the multiplexed signal with the level converter 8. can. Furthermore, since general television receivers tend to overscan considerably, this area that can actually be seen on a CRT becomes considerably narrower, making multiplexed signals even less noticeable, so there is no problem with compatibility in this respect either.

FIG. 2 shows an embodiment of the receiver for the transmission signal shown in the first diagram according to claim 2. The transmission signal is first sent to switch 1.
1, it is separated into a composite video signal of 388 active periods and a multiplexed signal of vertical blanking periods. The former is normal N
The signal is decoded by the TSC decoder 12 into component signals of Y, C, c2, and input to the receiving side line converter 21. The multiplexed signal is processed by a level converter 13. Buffer memory 14. 1: The original level is obtained by performing the reverse processing of FIG. 1 in the 4D/D converter 15.

The high frequency transmission signal YVH of the original size is obtained. This YV□ is input to the receiving side line converter 21.

In the line converter 21, the Y, CI, and c2 signals are scan-converted by 3:4 line converters 18, 18, and 19, respectively, from 388 effective scanning lines to 517 effective scanning lines and 525 scanning lines in order of 1 scanning signal. be done. These line converters 16
．． 18.19 can be realized using known techniques, and usually performs motion adaptive processing to improve image quality. For C, , C, the output of the line converters 18 and 19 directly becomes the output signal of the receiver, but for the Y signal, the 3:4 line converter 17 of the high frequency component converts the signal to Y, C, , C2. The signal obtained by adding the YVH signals scan-converted at a conversion ratio of 3:4 in the adder 20 becomes the Y signal output of the receiver. At this time, the motion signal is transmitted to the line converter 17 from the line converter 16.
Supplied from.

FIG. 4 shows a specific example of the configuration of the 8:3 line converter 2 for high frequency components shown in FIG. The input Y signal is band-limited by a YVH bris filter 31, which is a band filter regarding the vertical spatial frequency, to a vertical resolution of 388 to 517 lines, for example, and then a multiplier 32 alternately divides the band by +1.
-1 is multiplied.

The output of multiplier 32 is, for example, line converter 1.3 in FIG.
．． The 8:3 line converter 33, which has exactly the same circuit configuration and conversion characteristics as 4, converts the signal into a signal with 525 scanning lines and 388 effective scanning lines, similar to the Y, C, and C2 signals in FIG. Scan converted. With such a circuit, for example, vertical high frequency components with a vertical resolution of 388 to 517 can be transferred to the effective scanning line 3.
It is clear from the "Image Transmission System" filed on the same day as the present invention by the applicant that it can be transmitted as 88 signals.

On the other hand, the Y signal is also input to the 8;3 line converter 34. This line converter 34 is a line converter 1゜3.4.3
The circuit configuration is exactly the same as that of No. 3, but the conversion characteristics are different. For example, the conversion characteristics include a vertical resolution of 194 to 38
We use the characteristics to convert 8 video components. Such characteristics can be used in conventional line converters.

The outputs of the line converters 33, 34 are respectively controlled by the control coefficient converters 35.
After being multiplied by coefficients of 1-α and α in accordance with the motion signal input at 36, the signals are added at an adder 37 to obtain a transmission signal (YvH) regarding the vertical high frequency component. Control coefficient unit 35.
In 36, the coefficient α is 1 when the motion component in the image is large, and is 0 when there is no motion component. As a result, when the motion component of the image is large, the output of the line converter 34 becomes a YVH signal, and when it is zero, the output of the line converter 33 becomes a YVH signal. The value between α=1 and α=0 may be changed stepwise or continuously.

FIG. 5 shows a specific example of the configuration of the high frequency component line converter 17 shown in FIG. When the high frequency transmission signal (Y□) is manually inputted, it is input to the control coefficient multipliers 41 and 42.

In these control coefficient multipliers 41 and 42, coefficients 1-α and α are respectively multiplied according to the motion signal input. Control coefficient unit 41, 4
The operation of 2 is exactly the same as that of the control coefficient multipliers 35 and 36 in FIG.

The output of the control coefficient unit 41 is converted to Y by a 3:4 line converter 43 having the same circuit configuration and conversion characteristics as the line converter 1B, 18.19 in FIG. 2, for example.

C, 517 effective scanning lines 5 as well as the C2 signal
The signal is scan-converted into a 25-line sequential scanning signal.

The output of the control coefficient unit 42 is input to a 3:4 line converter 44 and scan-converted at the same conversion ratio as the line converter 43. The circuit configuration of the line converter 44 is exactly the same as that of the line converter 43, but the line converter 4 has different conversion characteristics.
For example, the conversion characteristics of line converter 43 may be the same as those of line converter 34 in FIG.
5, +1 . -1 is multiplied alternately.

By doing this, the vertical resolution is 388 from YVH.
It is clear from the above-mentioned "image transmission system" that ~517 components can be restored.

The outputs of the multiplier 45 and the line converter 44 are added by an adder 46, resulting in a signal of vertical high frequency components of an effective 517 tree. Through the operations of these elements 41 to 46, when the motion component in the image is large, YVH is scan-converted by the line converter 44, and when it is zero, YV)l is scan-converted by the line converter 431 and the multiplier 45. It is output as a vertical high frequency component signal.

The operation of the circuits shown in FIGS. 1, 2, 4, and 5 described above is explained in terms of a time-perpendicular spatiotemporal spectrum as shown in FIG. 6. Figure 6 (a) shows the characteristics for still images, and Figure 6 (b) shows the characteristics for moving images. In Figure 6, the horizontal axis is the temporal frequency f (Hz), and the vertical axis is the vertical spatial frequency or vertical resolution ν (tree).In the still image in Figure 6 (a), there are originally 1035 brightness signals of the high-definition signal. However, in the circuit of FIG. Since this is a tree of 388 effective scanning lines, the 8=3 line converter 1 in Fig. 1 has still image conversion characteristics such as, for example, the area B indicated by the dashed-dotted line in Fig. 6(a) as the passband. Use characteristics.

Due to this characteristic, the Y signal output from the line converter 1 in FIG. 1 becomes a signal with a vertical resolution of up to 388 lines as shown in FIG. 6(a). The reason why B is limited to 15 Hz in the time direction is to prevent aliasing distortion caused by the 388-tree 2:1 interlace carrier (Ci in the figure). Components with a resolution of 388 to 517 outside the band B above are generated by polarity inversion for each line in the multiplier 32 in FIG.
Using cl in a) as a carrier, the frequency is shifted to the YVH region indicated by diagonal lines in the figure. Due to this shift, if YVH is line-converted using a converter having characteristics B, components with a resolution of 388 to 517 can be transmitted through a transmission path of 388 effective scanning lines, similar to the above-mentioned Y signal.

On the receiving side, the signal can be correctly restored by performing the reverse process. In this case, the conversion characteristics of the line converter may be similar to those on the transmitting side.

On the other hand, in the moving image characteristics shown in FIG. 6(b), the vertical resolution of the Y signal is limited to 194 lines or less as shown in the figure in order to prevent the above-mentioned aliasing distortion due to CI during line conversion. For this reason, a phenomenon occurs in which the spatial resolution decreases when the image moves. To prevent this, it is sufficient to transmit the components in the region indicated by the dotted line in the figure as a yv□ signal.Scan conversion using such a region as a passband can also be realized by a normal line converter.

After scanning conversion with similar characteristics on the receiving side, Y signal and YV
By adding the H signal, a signal that does not significantly reduce the vertical resolution can be obtained even in moving images.

In the circuits of FIGS. 4 and 5, YV□ of FIG. 6(a)
Yv)I in the same figure (b) is used for motion adaptation, but
If the yJJ detection circuit is likely to malfunction due to the transmission line conditions or if you want to simplify the device, of course, use the method shown in Figure 6 (a).
), YVH in (b) can also be used individually.

FIG. 7 shows an embodiment corresponding to claim 2.

The high-definition signals of Y, CI+c2 are line-converted by the transmitting line converter 10, which is the same as that shown in FIG. YVH signal is 4: ID/D converter6. The signal is processed in the buffer memory and level converter 8 in the same manner as in FIG. 1, and becomes a multiplexed signal for the vertical blanking period.

By the way, if the transmission line is an NTSC transmission line, the band is 4.
The YV) I signal transmitted as the multiplexed signal has a horizontal spatial frequency of 1.0 MHz.
The YVH signal in a band of 5 MHz or more is transmitted by another means.

YVH in FIG. 7 is also input to the control coefficient unit 51, and only when the moving image component is small in the image, the next 1.05 to 3 MHz BP is input.
It is input to F (band pass filter) 52. The operation of the control coefficient unit 51 is similar to other control coefficient units 35, 36, etc., and the coefficient β becomes zero when the motion component is large and becomes 1 when there is no motion component. A motion signal for controlling this is supplied, for example, from the transmitting line converter 1o.

The yvH signal from which a suitable band has been extracted by the BPF 52 is amplitude-modulated by the carrier output from the switch 55 in the modulator 53, and becomes a multiplexed signal YvH' within 388 effective screens. The switch 55 is a switch whose state is inverted for each line and each field, for example, between a frequency A and a carrier whose phase is delayed by 180° using a π phase shifter 54.

It is disclosed in Japanese Patent Application No. 134125-1983 that if a signal is amplitude modulated using a carrier created by such an operation, a multiplexed signal compatible with the NTSC signal can be formed by utilizing gaps in the spatio-temporal spectrum of the NTSC signal. This invention is well known in ``Color Television Signal Transmission System'' and ``Color Television Signal Transmission System and Receiving Apparatus Therefor'' filed by the applicant on the same day as the present invention.

The output of this switch 55 has a frequency offset of 30 Hz from the color subcarrier of the NTSG signal.
It is commonly called PAF carrier. The YVH' signal modulated by this PAF carrier is added to the composite video signal by an adder 56. The output of the adder 56 and the output of the level converter 8 are switched by a switch 57, similar to the switch 9 in FIG. 1, to form a transmission signal.

FIG. 8 shows the configuration of a receiver which is an embodiment corresponding to claim 4. Similar to FIG. 2, the transmission signal from the transmitting section in FIG. 7 is separated by the switch 11 into a signal within 388 effective scanning lines and a vertical blanking multiplexed signal, and the multiplexed signal is sent to the level converter 13. Buffer memory 14. 1:
1.05M using the 4D/D changer 15 as in FIG.
The signal is restored to an H2 band signal.

On the other hand, 388 signals are input to a motion detection circuit 61 and a Y/C separation circuit 62.

The Y/C separation circuit 62 separates the composite video signal into Y/C signals using conventional means. If necessary, motion-adaptive three-dimensional Y/C separation may be performed based on the motion signal output from the motion detection circuit 61, which can be realized using known techniques, to improve image quality.

The Y signal output from the Y/C separation circuit 62 is directly input to the receiving side line converter 21 as shown in FIG.

As the color signal side output of the Y/C separation circuit 62, a signal obtained by adding Yv)I' in FIG. 7 to the carrier color signal (denoted as Co) is output. This signal is filtered by a spatio-temporal filter 63.
Separate into o and yvo'. The method of constructing this spatio-temporal filter 63 is known from the above-mentioned Japanese Patent Application No. 134125/1982, and therefore will not be described here.

The C° multiplied signal is demodulated into C, , C2 component signals by a normal color signal demodulation circuit and input to the line converter 21 . The YVH' signal is sent to switch 6 in demodulator 65.
6. The signal is demodulated by the carrier by the π phase shifter 67 in the same manner as on the transmitting side.

After a necessary band is extracted from the output of the demodulator 65 by a BPF 68 of 1 to 3 MH2, it is multiplied by a coefficient according to the movement of the image in a control coefficient multiplier 69 controlled by a motion signal supplied from a motion detection circuit 61. . The operation of the control coefficient unit 69 is similar to that of the control coefficient unit 51 shown in FIG.

The output of the control coefficient unit 69 is a vertical high frequency transmission signal multiplexed during the vertical blanking period.
is added to the output of the adder 70.

The output of the adder 70 is input to the receiving side line converter 21 as a Yv□ signal. This line converter 21 performs the same processing as in FIG. 2 and outputs 525 tree sequential scanning signals of Y, C, . According to the embodiment of FIGS. 1 and 2,
When the transmission path band is 4.2 MHz, the transmission band of the yvo signal is 1.05 MHz for both moving images and still images, but according to this embodiment, the YVH transmission band can be expanded to, for example, 3 MHz only for still images. . The reason why the band is expanded only for still images is that in the case of transmission using the PAF method, there is crosstalk between the C° signal and YVM'' in moving images.

FIG. 9 shows an embodiment of the transmitter according to claim 5.

The high-definition signals of Y, CI, and C2 are transmitted through a transmitting side line converter 1G, an NTSC encoder 5, and a 4:10/D converter 6. Processing is performed in the buffer memory 7 in the same manner as in FIG. The composite video signal output from the NTSC encoder 5 has a 4.2MHz LPF73 and a 4.2-6.5M
It is input to the BPF 72 of tlz. This LPF 73 extracts high-frequency components above 4.2 MHz, which is the band of a conventional transmission path, and the modulator 74 compresses the output of the LPF 73 into the position of the vertical blanking period, which is the output of the buffer memory. The YVH signal is amplitude-modulated in the modulator 71 by, for example, a carrier having twice the frequency fsc. The output of the modulator 71 becomes a multiplexed signal during the blanking period. The amplitude-modulated signals, which are the outputs of the modulator 74 and the modulator 71, are time-division multiplexed in the switch 75 by the same process as the switch 9 in FIG.

4.8M) Iz ~ 7.2M1 (Z's BPF 76 extracts only the lower sideband of the output signal of the switch 75, and the coefficient multiplier 77 doubles the output of the BPF 76 to match the level with the output signal of the LPF 73. .

After adding the output signal of the LPF 73 and the output signal of the coefficient multiplier 77 in the adder 78, this signal is added to the VSB-AM modulator 79.
, fv is modulated as a video carrier.

F
The M-modulated audio signals are added by an adder 80 to form a transmission signal.

In FIG. 9, the circuits 72 to 74 and 76 to 81 transmit the conventional
It is clear from ``Television Signal Transmission System and Receiving Apparatus'' filed on the same day as the present invention by the applicant that it is possible to form a broadband transmission signal that is compatible with both TS (TS) signals and video and audio.

In this embodiment, nothing is multiplexed in the vertical blanking period of the main transmission signal that occupies the lower 6 MHz band in the RF 9 MHz band, which is compatible with the conventional signal that is the output of the LPF 73, and the output of the coefficient multiplier 77 is used. The modulator 71 is used only during the vertical blanking period of the additional transmission signal occupying the upper 3 MHz band.
The multiplexed signals that are the outputs of the multiplexed signals are multiplexed. By doing so, in a conventional NTSC receiver, multiplexed signals are not visible at all, improving compatibility. However, the transmission band of the YVH signal is, for example, FIG. 1O, which is an example of a receiver for the transmission signal using the circuit of FIG. 9. The multiplexed signal separated by the switch 95 in the same manner as the switch 11 in FIG. Coefficient unit 10 for
The signal is multiplied by 4 and input into the buffer memory 14.

Buffer memory 14. 1: 4D/D converter 15.
NTSC decoder 12. The operation of line converter 21 is exactly the same as in FIG. Further, the operations 91 to 101 are clear in the above-mentioned "Television Signal Transmission System and Receiving Apparatus".

The circuits of FIGS. 9 and 10 make it possible to transmit the vertical high-frequency component transmission signal Yv)I in such a manner that the multiplexed signal is completely invisible to conventional receivers.

The present invention is not limited to the high-definition signal with 1035 effective scanning lines, the transmission signal with 388 lines, or the reproduced signal with sequential scanning of 517 lines as exemplified above, but can also be applied to signals with other numbers of effective scanning lines or other scanning lines.

Furthermore, the systems that are subject to compatibility are not limited to the NTSC system, but can also be used for PAL, SECAM, etc.

Further, in the embodiments described above, conventional devices are used as encoders and decoders for component signals, but the present invention is not limited to this, and encoders and decoders for HDTV or enhanced TV that are compatible with conventional signals can also be used.

In the embodiment, only horizontal D/D conversion was used as time compression for high-frequency components of vertical spatial frequencies, but time compression in the vertical direction (scanning line direction) (for example, line thinning, etc.) can also be used. In this case, for example, the line converter 2 in FIG.
If 16:3 line conversion is performed instead of 8:3 line conversion and then 2:1 D/D conversion is performed, multiplexed signals for 97 scanning lines can be obtained as in FIG. 1. Naturally, the receiving side performs the opposite operation to restore the signal.

(Effects of the Invention) As described above, according to the present invention, it is possible to improve the reduction in vertical resolution that occurs when transmitting a signal with a large aspect ratio using a conventional transmission path using a vertically different method for both still images and moving images. can.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing an embodiment of a receiver, and Fig. 3 is an example of an image when a transmission signal according to the present invention is displayed on a conventional receiver. 4 is a diagram showing a configuration example of an 8=3 line converter for high frequency components, FIG. 5 is a diagram showing a configuration example of a 3=4 line converter for high frequency components, and FIG. A diagram showing an example of a transmission spectrum according to the present invention in a time-vertical spatiotemporal spectrum, FIG. 7 is a diagram showing another embodiment, FIG. 8 is a diagram showing another embodiment, and FIG. 9 is a diagram showing another embodiment. FIG. 10 is a diagram showing another embodiment of the receiver. 1.2, 3.4...Line converter, 5...NTSC encoder, 6.-4: ID/D converter, 7...Buffer memory, 8...Level converter, 9...・Switch, 10... Transmission side line converter, 11... Switch, 12...-NTSC decoder, 13... Level converter, 14... Buffer memory, 15... 1:40/D Converter, 16.17, 18.19... Line converter, 20...
- Adder, 21... Receiving side line converter, 31..." YVH brifilter, 32... Multiplier, 33.34... Line converter, 35.3[i... Control coefficient unit , 37... Adder, 41.42... Control coefficient unit, 43.44... Line converter, 45... Multiplier, 46... Adder, 51... Control coefficient unit, 52... BPF. 53... Modulator, 54... π phase shifter, 55... Switch, 56... Adder, 57... Switch 1 61... Motion detection circuit, 62 ... Y/C separation circuit, 63... Space-time filter, 65... Demodulator, 66... Switch, 67... π phase filter, 68... BPF. 69... Control Coefficient unit, 70...Adder, 71...Modulator, 72...BPF. 73...-LPF. 74...Modulator, 75...Switch, 76...BPF. 7F ...Coefficient unit, 7B... Adder, 79-VSB-AM modulator, 80... Adder, 81...-FM modulator, 91... Audio notch filter, 92-VSB-AM demodulation 93... BPF of 4.5 to 8 MHz. 94---4.5Mf (LPF of z. 95... Switch, 96... Multiplier, 97-7MI (LPF of z. 98--・Coefficient unit, 99...Adder, 100...Audio BPF. 101...-FM demodulator, 102...Demodulator, 103...LPF. 104...Coefficient unit.

Claims (1)

[Claims] 1) Scanning the effective scanning lines of a television signal having a larger aspect ratio and a larger number of scanning lines than the predetermined television signal into a fewer number of effective scanning lines than the effective scanning lines of the predetermined television signal. In a method of transmitting a television signal with a larger aspect ratio while maintaining compatibility with a predetermined receiver by converting and transmitting the scan-converted television signal, the vertical blanking period of the scan-converted television signal is A television signal scan conversion transmission method characterized by time-compressing, multiplexing, and transmitting high-frequency transmission signals obtained by scan-converting high-frequency components. 2) A circuit that scan-converts the effective scanning lines of the transmission signal into a larger number of scanning lines and outputs the result, and a circuit that time-expands the multiplexed signal in the vertical blanking of the transmission signal, performs scan conversion, and then outputs the output signal. 2. The television signal scan conversion transmission system according to claim 1, further comprising a circuit on the receiver side. 3) When using signals to be multiplexed for vertical blanking in motion adaptation, a high-frequency transmission signal having a frequency higher than the transmission band with respect to the horizontal spatial frequency of the high-frequency transmission signal determined by the transmission path band and the compression rate of time compression. The television according to claim 1, wherein the still image portion of the image is amplitude-modulated using a carrier offset by an NTSC color subcarrier and a frame frequency, and multiplexed on the transmission signal within the effective scanning line. Signal scanning conversion transmission method. 4) After receiving the transmission signal and separating the amplitude-modulated signal from other signals using a spatio-temporal filter, it is demodulated using a carrier synchronized with the transmitting side, and only the still image part of the image is time-stretched within vertical blanking. 4. The television signal scan conversion transmission system according to claim 3, wherein the television signal is added to the signal. 5) A method in which the high-frequency components of a wideband television signal are separated and amplitude-modulated, and the modulated lower sideband is multiplexed and transmitted as an additional transmission signal in an additional band at or above the audio carrier frequency of a predetermined television signal. The television according to claim 1, wherein a scan-converted signal is used as the wideband television signal, and the multiplexed signal is amplitude-modulated and multiplexed during a vertical blanking period of the additional transmission signal. Signal scanning conversion transmission method.