JP2000232630A - Transmission method, reception method, transmitter and receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitter and a receiver adaptable for various video formats with different transmission rates without increasing the circuit scale and the cost. SOLUTION: The transmitter is provided with a line memory 1 that receives a video signal of a standard definition television SDTV system at a lower transmission rate to receive a video signal for an active period, a PLL 3 that generates a frequency around a transmission rate of a high definition television HDTV system on the basis of a clock signal of the video signal of the SDTV system, a control circuit 2 that controls the line memory 1 so as to fetch the video signal of the SDTV system for the active period and output the video signal, and an interface conversion circuit 4 that converts a format of the output of the line memory 1 into a transmission format of the HDTV system. The transmitter expands a horizontal blanking period of the video signal of the SDTV system and transmits the video signal at the transmission rate around the transmission rate of the video signal of the HDTV system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting method, a receiving method, a transmitting apparatus and a receiving apparatus for transmitting video signals of various formats used in a broadcasting station studio.

[0002]

2. Description of the Related Art To serialize and transmit video signals of various video formats used in a broadcasting station studio,
SMPTE (Society of Motion Picture and Televisi
on Engineers) and ARIB (Association of Radio Industries and Businesses) SMPTE259M standard, SMPTE
It is transmitted in a format according to the 292M standard, the BTAS S-004B standard, and the like. As described in these standards, in a broadcasting station studio, various formats having different frame frequencies, effective scanning lines, pixels per frame, and scanning methods (interlace scanning method, progressive scanning method) are used. It is used. For example, SDTV
(Standard Definition Television) method, 525 scanning lines, frame frequency 30 / 1.001H
z, interlaced scanning 480 / 60I method (hereinafter referred to as 4
80 / 60I), 525 scanning lines, 483 effective lines, frame frequency 60 / 1.001 Hz,
480 / 60P progressive scanning (hereinafter referred to as 48
0 / 60P), HDTV (High Definition Te
1125 scanning lines, 1080 effective lines, frame frequency 30 / 1.001H
z, 1080 / 60I method of interlaced scanning (hereinafter referred to as
1080 / 60I), 1125 scanning lines, 1,035 effective lines, frame frequency 30 / 1.001
Hz, 1035 / 60I method of interlaced scanning (hereinafter referred to as 1035 / 60I), 750 scanning lines, 720 effective lines, frame frequency 60 / 1.001H
z, progressive scanning 720 / 60P method (hereinafter referred to as
720 / 60P).

As shown in FIG. 2, a video signal of the 480 / 60I system has a frame frequency of 30 / 1.001 Hz, 525 scanning lines, and a sample number (word number) of 853, 1 scanning line (line). The number of effective samples (number of words) per scanning line is 720, and the frequency per sample (word) is 13.5 MHz. When the luminance signal and the color difference signal exist in the format of FIG. 2 and the 480 / 60I video signal is serialized and transmitted, the luminance signal Y and the color difference signal C are multiplexed for each word as shown in the SMPTE259M standard. The data is transmitted at a transmission speed of 270 Mbps.

On the other hand, in the case of a 1080 / 60I HDTV signal, the frame frequency is 30 / 1.001 Hz, which is the same as that of the 480 / 60I system, 1125 scanning lines (1080 effective scanning lines), and samples per scanning line. The number (words) is 2200, the number of effective samples (words) per scanning line is 1920, the frequency is 74.25 / 1.001 MHz per sample (word), and it is composed of a luminance signal and a color difference signal. And transmitted
As described in the SMPTE292M standard and the BTAS-004 standard, a luminance signal and a color difference signal are multiplexed for each word and transmitted at a transmission rate of 1.485 / 1.001 Gbps.

[0005]

However, when the various formats described above are serialized, the transmission speed is S
270M in case of 480 / 60I system which is DTV system
bps, 540 Mbps for 480 / 60P system
(For example, 270 Mbps is transmitted by two lines). On the other hand, 1080 / 60I and 720 /
In the 60P system, the transmission speed when serialized is 1.4.
85 / 1.001 Gbps, 1.485 Gbps in the 1035 / 60I system. HDTV transmission rates are 1.485 / 1.001 Gbps and 1.485 Gbps
However, since the difference between the two transmission speeds is relatively small, a transmission device and a reception device corresponding to the two transmission speeds can be realized relatively easily. However, the SDTV method with a transmission speed of 270 Mbps or 540 Mbps,
Transmission speed of 1.485 Gbps and 1.485 / 1.0
Since the transmission speed is greatly different from that of the HDTV system of 01 Gbps and the method of multiplexing the digital synchronization signal during serialization is different, it is difficult to realize a transmission device using a common device. When both types are used, a transmission device and a reception device corresponding to each type are required, and the circuit scale and cost increase, and the operation in a studio or the like becomes complicated.

Accordingly, the present invention provides an S
By converting the transmission speed of the DTV system to a transmission speed near the HDTV system having a higher transmission speed and transmitting the data, the HDTV
It is an object of the present invention to provide a transmission method and a transmission apparatus capable of performing SDTV transmission with low delay and without significant circuit change from a transmission apparatus and a reception apparatus of the transmission method.

A receiving method and a receiving method for automatically detecting the SDTV video signal and the HDTV video signal which have been converted to a transmission speed near the HDTV system and transmitting the both signals are automatically detected. It is intended to realize the device.

[0008]

SUMMARY OF THE INVENTION In order to solve this problem, a transmission method and a transmission apparatus according to the present invention include: a line memory for inputting an SDTV video signal and capturing an active section of the video signal; P that generates a frequency near the transmission speed of the HDTV system from the signal clock
LL and a control circuit for controlling the line memory so that the active section of the video signal of the SDTV system is fetched and output to the line memory, and an interface format circuit for converting the output of the line memory to the transmission format of the HDTV system. Things.

Further, a receiving method and a receiving apparatus according to the present invention
An interface deformatter circuit for automatically detecting various systems of the transmitted video signal, and a transmitted SDT
It comprises a line memory for taking in the active section of the V signal, and a control circuit for controlling the line memory so as to convert it to the original SDTV signal.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) SDTV with low transmission speed
A transmission device that converts a video signal of the HDTV system to a signal near the transmission speed of the HDTV system and outputs the converted signal will be described below.

First, a case of converting a 480 / 60I SDTV video signal will be described with reference to FIGS.

As described above, the transmission speed of the 480 / 60I system is 270 Mbps, and the 720 / 60P system and 108
The transmission rate of the 0 / 60I system is 1.485 / 1.001M
bps. The operation of converting a 480 / 60I video signal into a transmission rate of about 1.485 / 1.001 Gbps will be described below.

FIG. 1 is a block diagram showing a configuration of a transmitting apparatus according to Embodiment 1 of the present invention. FIG. 2 is a diagram showing the format of an input 480 / 60I video signal. FIG. 3 is a timing diagram of the device shown in FIG. FIG. 3 shows 480/60 in the present embodiment.
Transmission speed of video signal of I system is about 1.485 / 1.001
It is an example of conversion to a Gbps signal.

The total number of pixels per frame of the 1080 / 60I system is 1125 × 2200 as described above.
On the other hand, the total number of pixels per frame of the 480 / 60I video signal is 525 × 853 as shown in FIG. 4
The video signal of the 80 / 60I system is converted to 1.485 / 1.001.
In the case of conversion to Gbps, the number of effective samples per horizontal line (the number of words), ie, the number of effective pixels per scanning line remains 720 while the number of scanning lines remains 525, and the number of samples in the horizontal blanking period remains 720. The number (word number) is increased, and the number of samples (word number) per line (scan line) is expanded. In other words, the video signal of the 480 / 60I system is used, and the number of samples (the number of words) per scanning line is (1125 × 2200) /
525, and may be transmitted at a transmission rate of 1.485 / 1.001 Gbps.

However, if the number of words per scanning line is (1125 × 2200) / 525, this value is not an integer of 4714.26.
Lines having the number of words per scanning line of 4715 and 4714 are mixed. As described above, when transmitting and receiving signals in which the number of words per scanning line is not a fixed value but two or more different values, it is difficult to detect synchronization on the receiving side.

The reason will be specifically described. In the case of serial transmission, the EAV (End of Act)
ive Video) and a digital synchronizing signal called SAV (Start of Active Video) are detected to establish synchronization. This E
If the timing at which AV or SAV is input is fixed (that is, if the total number of words per scanning line, the number of effective pixels, etc., is a single value), EA occurs due to a transmission error.
Even when an error occurs in V or SAV and EAV or SAV cannot be detected, EAV or SAV is input at the same timing, so that stable synchronization can be established on the receiving side.
However, when a signal of a format in which the generation timing of EAV or SAV is different for each line is input and an error occurs in EAV or SAV and EAV or SAV cannot be detected, EAV or SAV cannot be detected.
It is difficult to establish synchronization because the generation timing of AV or SAV is unknown on the receiving side. Therefore, the number of words per scanning line needs to be a single value (fixed value) in video format units.

For the reasons described above, the number of words per scan line is rounded up or down 4714 or 4 in order to fix the number of words per scan line.
715. In this case, the total number of samples per frame, that is, the transmission speed in the case of serialization is HDT
Since this is different from the case of the 1080 / 60I system, which is the V system, the frequency per word is changed and the frame frequency is transmitted at 60 / 1.001 Hz. That is, 1
Assuming that the number of words per scanning line is 4714, the serial transmission speed is ｛(4714 × 525) / (220
0 × 1125)｝ × 1.485 / 1.001 = 1.48
34 Gbps.

Similarly, the number of words per scanning line is 471
When it is set to 5, ｛(4715 × 525) / (220
0 × 1125)｝ × 1.485 / 1.001 = 1.48
37 Gbps.

Therefore, the frequency of one word is 74.171M when the number of words per scanning line is 4714.
Hz, which is 74.187 MHz when the number of words per scanning line is 4715.

The serial transmission speed of the HDTV system is as follows.
485 / 1.001 Gbps (= 1.4835 Gbps)
s) and 1.485 Gbps. Since the difference between the two frequencies is relatively small, it is relatively easy to realize a transmitter and a receiver corresponding to the two transmission speeds. In this case, a hardware such as a PLL (phase-locked loop) circuit is used. Due to the configuration, 1.485 / 1.001 Gbps to 1.485.
Since there is a large possibility of supporting transmission speeds up to 485 Gbps, when converting the 480 / 60I system to a vicinity of the serial transmission speed of the HDTV system, 1.485 / 1.00 is required.
Desirably between 1 Gbps and 1.485 Gbps. 1.485Gbps and 1.485 / 1.001G
If consideration is given to matching with an HDTV device that supports two types of transmission speeds of 480/60 bps, the 480 / 60I method is used for HDTV.
In the case where the data is converted to a value close to the serial transmission speed of the system, it is preferable to set the number of words per scanning line to 4715 and the serial transmission speed to 1.4834 Gbps as shown in FIG.

If the transmission speed is closer to the transmission speed of 1.485 / 1.001 Gbps, the number of words per scanning line may be 4714.

Next, referring to FIGS. 1 and 3, 48 shown in FIG.
As shown in FIG.
The operation of the transmitting device for converting the signal to a transmission speed near the V system will be described. Hereinafter, a case where the number of words per scanning line is set to 4715 will be described.

In FIG. 1, reference numeral 1 denotes a line memory for fetching an active section of the 480 / 60I system, and 2 denotes a 480 / 60I system.
The line memory 1 receives the clock of the 60I video signal and the clock of the interface, receives the horizontal and vertical timing signals of the 480 / 60I video signal, and captures and outputs the active section of the 480 / 60I video signal. And a control circuit that outputs horizontal and vertical timing signals of the interface. 3 is 4
A PLL circuit 4 generates an interface clock from a clock of an 80 / 60I video signal, and an interface formatter circuit 4 adds an HDTV signal format digital synchronization signal to the output of the line memory 1.

First, an active section of a 480 / 60I video signal is loaded into the line memory 1. In the PLL circuit 3, 74.187 MHz [= ｛(4715) from the 13.5 MHz 480 / 60I video signal clock.
× 525) / (2200 × 1125)｝ × 74.25 /
1.001].
In this case, since the line frequency of the video signal of the 480 / 60I system is the same as the line frequency of the interface, it can be easily generated. 4 captured in line memory 1
The active section of the video signal of the 80 / 60I system is output by a read signal generated by the control circuit 2 and an interface clock.

When the active section is output from the line memory 1, the last word of the 480 / 60I active section and the read signal of the line memory 1 are read to minimize the delay on the transmission side as shown in FIG. The last (the end of the read section in one line) is set at almost the same timing. For example, when the last word of the active section of the video signal of the 480 / 60I system and the end of the readout signal are not set at almost the same timing, but the first word and the beginning of reading of the line memory 1 are output at almost the same timing, When viewed from the input 480 / 60I video signal, the conversion delay is one line, and the delay is large. Therefore, by outputting from the line memory 1 at the timing as shown in FIG. 3, it is possible to output on a line which is substantially the same as the line of the video signal of the 480 / 60I system in time. Can be suppressed to the minimum value.

Next, the video signal output from the line memory 1 is input to the interface formatter circuit 4. In the interface formatter circuit 4, EAV, line number, CRC (cyclic red) are added to the video signal output from the line memory 1 in accordance with the horizontal and vertical timing signals of the interface output from the control circuit 2.
undancy check), multiplex digital synchronization signals for serial transmission such as SAV, and the number of scanning lines, the number of words in an active section per line, the total number of words in one line, etc. are different, but EAV, SAV, line number, The format of the digital synchronization signal such as CRC is SMPTE292
M and BTA Output in the same manner as the S-004 standard. Except for the active section of the video signal output from the line memory 1, the pedestal level is set as a horizontal and vertical blanking section. When multiplexing auxiliary data as in the HDTV system, the auxiliary data is multiplexed in the horizontal and vertical blanking sections.

With the above configuration, the video signal of the 480 / 60I system is converted to the vicinity of the transmission speed of the HDTV system,
Without significant circuit changes from the HDTV transmitter
It is possible to realize a transmission device that outputs with low delay.

In the above description, the case of serial transmission has been described, but parallel transmission can also be realized.

In the above description, the case where the number of words per scanning line is 4715 has been described.
The same can be realized when the number of words per scanning line is 4714.

Although the description has been given of the video signal of the 480 / 60I system, the present invention can be similarly realized by other video systems. Taking a 480 / 60P video signal as an example, 48
The 0 / 60P video signal has 525 scanning lines and a frame frequency of 60 / 1.001 Hz. 720 / 60P
The video signal of the system has 750 scanning lines and a frame frequency of 60.
/1.001 Hz, 165 words per scan line
0. When the number of words per scanning line is calculated in the same manner as in the case of the 480 / 60I system, (750 × 1650) /
525 = 2357.14. Rounding up or down the decimal places results in 2357 words per scan line.
Or 2358. Therefore, when the number of words per scanning line is 2357, the transmission speed is Δ (2357 ×
525) / (750 × 1650)｝ × 1.485 / 1.
001 = 1.4834 Gbps, and when 2358 is set, ｛(2358 × 525) / (750 × 165)
0)｝ × 1.485 / 1.001 = 1.4841 Gbp
s.

(Embodiment 2) Next, the SDTV system video signal and the system of the HDTV system video signal which are converted to a transmission speed near the HDTV system and transmitted as shown in Embodiment 1 are automatically detected. A receiving apparatus that realizes both types of reception will be described as a second embodiment with reference to FIGS.

First, a standard and a receiving method for serial transmission of the HDTV system will be described with reference to FIGS. 8 and 9 are schematic diagrams of parameters of various HDTV systems indicated in the SMPTE292M standard, FIG.
Is a schematic diagram of a digital synchronization signal specified in the SMPTE292M standard.

The standard for serial transmission of the HDTV system is described in the SMPTE292M standard. SM
In the PTE292M, as shown in FIG. 8, a total of 13 video systems having different scanning systems and different numbers of effective lines are targeted. The target video systems can be roughly classified into the following three items. The first is a progressive scan (progressive scan) or an interlaced scan (interlaced scan). The second is the number of effective scanning lines (1080 or 1035).
The third is the frame frequency (60Hz or 30Hz).
Hz or 25 Hz). In each of these methods, as shown in FIG. 10, a digital synchronization signal of EAV, LN (line number data), CRC (error detection data), and SAV is added to a video signal and transmitted.

The receiver detects the digital synchronization signal added to the video signal, establishes synchronization, and outputs horizontal and vertical timing signals. Here, even if an error occurs in the transmission path and an error occurs in the digital synchronization signal and the digital synchronization signal cannot be detected, in order to stably output the horizontal and vertical timing signals, the horizontal timing signal and the It is necessary to know in advance the output timing of the vertical timing signal (ie, what the transmitted scheme is). Therefore, in order to receive signals of various video formats using the same receiving device and stably output horizontal and vertical timing signals, it is necessary to automatically detect the type of the input signal.

Next, a receiving method for automatically detecting various HDTV systems shown in FIGS. 8 and 9 will be described. 13
Various HDTV schemes are shown in FIG. As shown in FIG. 9, the number of words per line and the F bit of the digital synchronization signal are 0.
In this case, the combination with the rising line of the V bit differs for each system. Since the number of words per line is the interval from the EAV shown in FIG. 10 to the next EAV, the interval is such that the H bit becomes 1, so that the H bit in the ERV must be set to detect the number of words per line. The interval that becomes 1 is detected. The F bit indicates the first field when it is 0 in the case of interlaced scanning and the second field when it is 1 and is fixed to 0 in the case of progressive scanning. V bit is 1
Indicates the digital field blanking period. Since the line number is added to the next two words of the EAV, the line number at the rising timing of the V bit when the F bit is 0 is detected. It is possible to determine the format of the input video signal based on these two types of detection results.

Next, referring to FIG. 5, FIG. 6, and FIG.
The operation of the receiving device that automatically detects the TV system will be described. 5 and 6 are block diagrams showing a configuration of the receiving apparatus according to Embodiment 2 of the present invention. FIG. 7 shows an interface deformatter circuit in the receiver shown in FIGS. 5 and 6 for automatically detecting the system.

In FIG. 5, a serialized and transmitted video signal is input from a receiving means such as a serial / parallel conversion circuit to an interface deformatter circuit 5 in FIG. In the interface deformatter circuit 5, first, the synchronization signal detection circuit 9 detects a digital synchronization signal added to the input video data. Next, the horizontal sample number detection circuit 10 detects an interval (the number of words) at which the H bit in the EAV of the digital synchronization signal becomes 1. The blanking start line detection circuit 11
Then, the number of lines in the line number data when the V bit changes from 0 to 1 when the F bit of the EAV of the digital synchronization signal is 0 is detected. Next, the horizontal sample number detection circuit 10
9 based on the detection result output from the blanking start line detection circuit 11 and FIG.
Then, the value of each HDTV system and the detection result are compared to determine the system of the input video data.

The format determining circuit 13 will be described in detail. For example, the output of the horizontal sample number detection circuit 10 is 1650, and the blanking start line detection circuit 1
1 is 746, the frame frequency is 6
It turns out that it is a 720 / 60P system (L or M in FIG. 8) of 0 Hz or 60 / 1.001 Hz. Also here
As for L and M in FIG. 8, two systems having the same total number of lines per frame, the number of effective lines, and the same scanning system but differing only in the frame frequency are detected based on the transmission speed. I do. Similarly, when the output of the horizontal sample number detection circuit 10 is 2200 and the output of the blanking start line detection circuit 11 is 561, the frame frequency is 60 Hz or 60 / 1.001 Hz.
It can be seen that the system is the 80 / 60I system (D or E in FIG. 8).

Next, based on the result of determination by the format determination circuit 13, the timing generation circuit 12 outputs horizontal and vertical timing signals of the interface. With such a configuration, it is possible to stably establish synchronization even when a transmission error occurs, and to generate horizontal and vertical timing signals. Also, since the transmitted system is an HDTV system signal and has an original signal format, the video signal (1) output from the interface deformatter circuit 5
And the video clock (1) are used as original signals.

Next, the SDTV video signal and the HDTV video signal which have been converted to the transmission speed near the HDTV system as shown in the first embodiment and the HDTV system video signal are automatically detected and both types of reception are performed. The operation of the receiving apparatus to be realized will be described. The transmitted signal is H as shown in the first embodiment.
SDTV converted to transmission speed near DTV system and transmitted
The case of the video signal of the system will be described below.

FIGS. 5 and 6 show a receiving apparatus according to a second embodiment of the present invention. FIG. 7 is an interface deformatter circuit in the receiving apparatus of FIGS. FIG.
FIG. 5 is a timing chart in a case where the SDTV video signal (the signal in FIG. 4) converted to a transmission speed near the HDTV format and transmitted by using the receiving apparatus in FIGS. 5 and 6 described in the first embodiment. is there.

First, a description will be given with reference to FIG. In the same manner as in the case of automatically detecting the HDTV system in FIG.
The interval (number of words) at which the H bit in V becomes 1 is the line number data when the V bit changes from 0 to 1 when the F bit of the EAV of the digital synchronization signal is 0 in the blanking start line detection circuit 11. Each of the numbers of the lines within is detected. Next, in the format detection circuit 13, if the detection results of the horizontal sample number detection circuit 10 and the blanking start line detection circuit 11 are the values shown in FIG. 480 / 60I SD which is converted to a transmission speed near the HDTV system shown in the first embodiment and transmitted.
When a video signal of the TV system is transmitted, the horizontal sample number detection circuit 10 detects 4715 (or 4714), and the blanking start line detection circuit 11 detects 2615 (or 4714).
4 is detected. When this value is detected and input, the format determination circuit 13 can determine that the signal is a signal obtained by converting a 480 / 60I video signal into a transmission speed near the HDTV format.

Next, the control circuit 7 receives the horizontal and vertical timing signals of the interface output from the interface deformatter circuit 5, fetches the video data active video section, and transmits the 480/60 before conversion on the transmission side.
The line memory 6 is controlled so as to output according to the I method.

Also, as shown in FIG. 6, the original horizontal and vertical timing signals of the video signal and the clock (the horizontal and vertical timing signals of the video signal (2) and the video signal clock (2) in FIG. 5) are inputted from outside. Instead, it is also possible to generate the clock of the original video signal from the PLL circuit 8, generate the horizontal and vertical timing of the interface, and generate the read signal of the line memory 6 from the original video signal clock.

With such a configuration, the 1080 / 60I
There is no significant circuit change from the HDTV receiving device such as the HDTV system, and the transmission speed is converted to a transmission speed near the HDTV system and transmitted.
Automatically detects the format of the DTV video signal and HDTV video signal, and converts the SDTV video signal to a transmission rate near the HDTV format and converts the transmitted SDTV video signal to the original form with low delay. An output receiving device can be realized.

In the above description, the video signal of the 480 / 60I system has been described as the SDTV signal.
A video system such as the 480 / 60P system can be similarly realized. For example, in the case of the 480 / 60P system, the horizontal sample number detection circuit 10 in FIG.
58) is detected and the blanking start line detection circuit 1
At 1, 1 is detected and the transmitted signal is 480 / 60P
Can be determined.

In the above description, the horizontal sample number detection circuit uses the interval at which the H bit becomes 1 as the number of samples per line, that is, the EAV interval, but the interval at which the H bit becomes 0, that is, the SAV of the SAV. The same can be realized by using an interval.

In the horizontal sample number detection circuit, the number of samples in one line is used. However, the number of samples in the horizontal blanking period (the interval until the H bit changes from 1 to 0, ie, E
This can be realized in the same manner by using an interval from AV to SAV).

In the blanking start line detection circuit, the line number of the rising edge of the V bit when F = 0 is used, but when the F bit = 0 from the falling edge of the V bit when F bit = 0. (The number of effective lines in the first field during interlaced scanning and the number of effective lines per frame during progressive scanning).

(Embodiment 3) Next, a method of transmitting an audio signal when a 480 / 60I video signal as shown in Embodiment 1 is transmitted in the form of FIG. 4 will be described with reference to FIGS. Will be explained. FIG. 12A shows BTA S-
006 standard voice data packet, FIG.
UDW0 and UDW when audio clock phase information in UDW0 and UDW1 of 2 (a) is expanded to 13 bits
1, FIG. 13 shows a video signal of the 480 / 60I system of about 1.4.
A transmitter for converting the transmission rate to 85 / 1.001 Gbps and multiplexing an audio signal to a video signal. FIG. 14 reproduces a 480 / 60I video signal from the video signal shown in FIG. This is a receiving device that reproduces a multiplexed audio signal.

First, a method of transmitting an audio signal when transmitting an HDTV signal serially will be described. 1080/6
Regarding the serial transmission method of HDTV signals such as the 0I system, as described above, the SMPTE292M standard and the BTA S-0
04 standard. In serial transmission, auxiliary data such as an audio signal can be multiplexed in the horizontal blanking interval of the HDTV signal. For the audio multiplexing method for serial transmission of the HDTV signal, see SMPTE29.
It is shown in the 9M standard and the BTAS S-006 standard. B
In the TAS-006 standard, an audio data packet obtained by packetizing an audio signal as shown in FIG. 12A is multiplexed and transmitted in a horizontal blanking interval of a video signal. On the receiving side, audio data packets multiplexed in the horizontal blanking interval are separated, converted into audio signals, and output. Also, as a timing signal for converting an audio packet multiplexed during the blanking period on the receiving side into an audio signal, the transmitting side uses audio clock phase information ((a in FIG. 12) indicating the audio signal input timing for the video signal. ) From ck0 to c
k11) is multiplexed into the audio data packet. The audio clock phase information is expressed by the number of video clocks in a section from the first word of the EAV immediately before the video signal to the rising timing of the input audio sampling clock. That is, the audio clock phase information needs to display a value up to the number of words per one scanning line (horizontal line) of the video signal.

However, in the SMPTE299M standard and the BTA S-006 standard, c in FIG.
As represented by k0 to ck11, this audio clock phase information is represented by 12 bits (up to 4096), and the audio signal is multiplexed and transmitted as an audio data packet in the horizontal blanking interval of the signal shown in FIG. Since the number of words per scanning line is 4715,
It cannot be represented by bits (4096). Therefore, when multiplexing and transmitting an audio signal to a video signal whose number of words per scanning line exceeds 4096 (12 bits) as shown in FIG. 4, the audio clock phase information in the audio data packet is changed from 12 bits. It is expanded to 13 bits and transmitted. When the audio clock phase information is extended to 13 bits, as shown in FIG.
The 13th bit of B uses bit number 5 of UDW1, which is not used in SMPTE 299M or BTA S-006 standard which is an audio transmission standard for HDTV signals. When 13 bits of audio clock information are required, the transmission device for the HDTV signal of the 1080 / 60I system or the like can be greatly changed by using bit number 5 of the UDW1 of the audio data packet as the MSB. The audio signal can be multiplexed even to a video signal having more than 4096 words per scanning line. Also, when multiplexing an audio signal with an HDTV signal such as a 1080 / 60I system, the compatibility is high and only 12 bits are used.
Since the third bit is 0 as before, the HDTV
Signal transmission can be realized by the same circuit.
Also, on the receiving side, by using the 12 bits of the audio clock information and the 13th bit which is the MSB of the extended audio clock information, it is possible to reproduce the packetized and transmitted audio signal.

Next, the video signal of the 480 / 60I system is shown in FIG.
The operation of the transmitting device and the receiving device for multiplexing the audio signal when transmitting in the mode described above will be described. As shown in FIG. 13, when multiplexing an audio signal, the interface formatter circuit 4 converts the audio signal into an audio data packet, extends the audio clock phase information bits to 13 bits, and inputs the audio clock phase information bit to the interface formatter circuit 4. The sampling clock of the audio signal indicated by the number of samples in the horizontal direction of the video signal is multiplexed and transmitted. Compared to the case where the audio signal is multiplexed with the HDTV system, only this audio clock phase information is extended to 13 bits, and the system for transmitting the remaining audio signal is the same as the case where the audio signal is multiplexed with the HDTV system. . In the receiving apparatus, as shown in FIG. 14, the interface deformatter circuit 5 separates the audio data packet multiplexed during the blanking period of the video signal, converts it into an audio signal, and outputs it. At this time, HD
The audio clock phase information in the TV audio data packet is 1
Process as 3 bits.

With such a configuration, it is possible to multiplex and transmit an audio signal to a video signal when the number of words per scanning line exceeds 4096.

In the above description, the 480 / 60I system is converted as shown in FIG.
Although the multiplexing of the audio signal in the case of being transmitted at around 1.001 Gbps has been described, the case where the audio signal is multiplexed with another video signal having more than 4096 scanning lines can be similarly realized.

(Embodiment 4) Next, a transmitting apparatus for converting an SDTV video signal of a plurality of channels having a low transmission rate into a signal near an HDTV transmission rate and outputting the converted signal will be described below.

First, the 480 / 60I system S shown in FIG.
A case where a two-channel video signal of the DTV system is converted to a signal near the transmission speed of the HDTV system and transmitted as a one-channel signal will be described with reference to FIGS.

First, the transmission method will be described. HDTV
In the case of serial transmission by a system, a digital synchronization signal is added to each of a 10-bit luminance signal Y and a 10-bit color difference signal C and transmitted. In the first embodiment, 1
In the case of the video signal of the 480 / 60I system of the channel, the 10-bit luminance signal Y of the 480 / 60I system and 10
A case has been described in which a digital synchronization signal is added to each of the color difference signals C of bits and transmitted.
When multiplexing and transmitting 0 / 60I video signals,
A 10-bit luminance signal Y of the 480 / 60I system and a 10-bit color difference signal C for one channel are multiplexed into 10-bit video data, and a digital synchronization signal is multiplexed on the 10-bit video data and transmitted. That is, when 480 / 60I video signals for two channels are multiplexed and transmitted, the number of words per one scanning line is 4715, as compared with the first embodiment. The speed is also 1.4837 Gbps, but the number of effective data words per scanning line is 1440, which is doubled because the luminance signal Y and the color difference signal C are multiplexed.

Next, referring to FIG.
The operation of the transmitting apparatus when transmitting a video signal of the / 60I system will be described. FIG. 15 shows the 480 / 60I of FIG.
This is a transmission device in the case of multiplexing and transmitting video signals of two systems for two channels. First, a luminance signal Y and a color difference signal C of a one-channel 480 / 60I video signal are input to the line memory 14 in a multiplexed state, and the active section is fetched. In the PLL circuit 3, 480 / 60I of 27 MHz
From the video signal clock of the system, 74.187 MHz [=
{(4715 × 525) / (2200 × 1125)} ×
74.25 / 1.001] interface clock. Also, 48 of one channel is stored in the line memory 15.
The luminance signal Y and the color difference signal C of the 0 / 60I video signal are input in a multiplexed state, and the active section is fetched. 480/6 taken into line memories 14 and 15
The active section of the video signal of the 0I system is output by the readout signal generated by the control circuit 2 and the clock of the interface. When outputting the active section from the line memories 14 and 15, as shown in the first embodiment, the last word of the 480 / 60I system active section and the last of the read signal of the line memories 14 and 15 (read in one line) The end of the section) is set at almost the same timing. By outputting at such timing, 48
It is possible to output on a line that is substantially the same as the line of the video signal of the 0 / 60I system in time, and it is possible to suppress the delay during conversion to a minimum value. Next, line memory 1
The video signals output from 4 and 15 are input to interface formatter circuit 4. In the interface formatter circuit 4, the line memories 14, 14 according to the horizontal and vertical timing signals output from the control circuit 2.
A digital synchronizing signal for serial transmission such as EAV, line number, CRC, SAV, etc. is multiplexed on the video signal output from 15, and the number of scanning lines, the number of words in an active section per line, and the total number of words in one line However, the format of the digital synchronization signal such as EAV, SAV, line number, and CRC is SMPTE292.
Output in the same manner as in the M and BTAS-004 standards. The pedestal level is set as a horizontal and vertical blanking interval other than the active interval of the video signal output from the line memories 14 and 15. When multiplexing the auxiliary data, the auxiliary data is multiplexed in the horizontal and vertical blanking sections.

With such a configuration, two channels of 480
It is possible to realize a transmission device that multiplexes the / 60I video signal and realizes transmission with low delay without adding a complicated circuit near the transmission speed of the HDTV signal.

In the above description, the case of the video signal of the 480 / 60I system has been described. However, the present invention can be similarly realized by other video systems. For example, when transmitting the 480 / 60P system for two channels, the number of words per scanning line is 2357 (or 2358), and the number of valid data words per scanning line is 1440.

In the above description, a case has been described in which video signals of the 480 / 60I system are multiplexed and transmitted on two channels.
Similarly, multiplex transmission of two or more channels can be realized as long as the number of words does not exceed the number of words per scanning line. For example, 48
In the case of transmitting 4 channels of the 0 / 60I system, the number of words per scanning line is 4715 (or 4714), and the number of words of valid data per scanning line is 2880.

In the above description, the case of serial transmission has been described, but parallel transmission can also be realized.

In the above description, the case where the phases (delay amounts) of the video signals of a plurality of channels at the time of line memory input are the same has been described. However, the horizontal and vertical timing signals of the video signals are input for each channel. Then, a write signal to the line memory is provided for each channel, and read out from the two line memories in accordance with the timing of the channel having a large delay amount, so that video signals of the same signal system having different phases (delay amounts) can be obtained. It is also possible to multiplex and transmit.

(Embodiment 5) In Embodiment 1, the SD
A case has been described in which the video signal of the TV system is converted to the vicinity of the transmission speed of the video signal of the HDTV system by extending the horizontal blanking period. In the following, the video signal of the SDTV system is converted into the horizontal blanking period and the number of lines. To
A case where the video signal is transmitted at the transmission speed of the HDTV system will be described.

First, a transmitting method and a transmitting apparatus for converting a 480 / 60I SDTV video signal will be described.

FIGS. 18 and 19 show an example of conversion of a 480 / 60I video signal to a transmission rate of 1.485 / 1.001 Gbps in Embodiment 5 of the present invention. FIG. 20 is a timing chart of the transmitting apparatus when the 480 / 60I video signal in the fifth embodiment is converted to a transmission rate of 1.485 / 1.001 Gbps.

First, the transmission method will be described. As described in Embodiment 1, HDT of 1080 / 60I system
The total number of pixels per frame of V is 1125 × 2200
, And the transmission speed becomes 1.485 / 1.001 Gbps. On the other hand, the total number of pixels per frame of the 480 / 60I SDTV is 525 × 853. 480/6
The SDTV signal of the 0I system is 1.485 / 1.001Gb
When converting to the same transmission rate as ps, the number of effective samples (word number) per horizontal line is 720, and the number of effective lines per frame is the same as the number of effective lines of the 480 / 60I system. The transmission rate is converted to the same transmission rate as that of the HDTV system by increasing the number of lines per frame and the number of samples per period. The SDT of the 480 / 60I system is realized by such a system.
The V signal can be converted into the same transmission rate as the HDTV video signal transmission rate with a fixed number of horizontal line samples and a small transmission delay.

The number of lines and the number of horizontal samples per frame after conversion are close to 525 in the case of the 480 / 60I system, and the number of lines after conversion × the number of horizontal samples after conversion is 1080 / 60I. By using the same value as the total number of pixels per frame of 2200 × 1125 in the case of the system, it is possible to minimize the transmission delay. That is, the number of lines of the 480 / 60I system is 550,
The number of horizontal samples may be 4500. Further, FIG.
As shown in the figure, the ratio of the total number of lines 525 of the 480 / 60I system to the total number of converted lines 550 is 480/6
Since 21 lines of the 0I system and 22 lines of the converted signal have the same time, one line is added for every 21 lines of the 480 / 60I system, and a total of 5 lines
Convert to 50 signals. Note that the effective section of the line to be added is set at the pedestal level. Specifically, 22 × n + 1 (n is an integer in ascending order from 0) of the converted signal is set as an additional line, and the effective section of the additional line is set at a pedestal level. Therefore, a 480 / 60I video signal having a total number of 525 lines is converted to a total number of 550 lines.
When converting into 480 signals, if (480 / 60I system line) / 21 = m (where m is rounded up below the decimal point), the 480 / 60I system line is 550 signal m + (480 / 60I system line) line. For example, 20 lines of the 480 / 60I system are inserted into 21 lines after conversion, 22 lines of the 480 / 60I system are inserted into 24 lines after conversion, and 525 lines of the 480 / 60I system are inserted into 550 lines after conversion.

Next, the operation of the transmitting apparatus will be described. The transmitting apparatus according to the fifth embodiment can be realized by the same apparatus as the first embodiment shown in FIG. The operation will be described with reference to FIG. First, the active section of the 480 / 60I video signal is loaded into the line memory 1. PLL circuit 3
Then, a 74.25 / 1.001 MHz interface clock is generated from a 13.5 MHz 480 / 60I video signal clock.

480/6 taken into line memory 1
The active section of the video signal of the 0I system is output by the readout signal generated by the control circuit 2 and the interface clock. When the active section is output from the line memory 1, as described above, the 480 / 60I video signal interface is connected to the 480 / 60I video signal interface 22 × n + 1 (integers in ascending order from n = 0). 22 × n without reading the active section
The pedestal level is inserted in the +1 line. Therefore, the video signal of the 480 / 60I system is converted into a video signal of 550 lines.
When converting into a book, the line of the video signal of the 480 / 60I system is (line of the 480 / 60I system) / 21 = m
(Where m is rounded up below the decimal point), m + (480 / 60I system line) of a signal of 550 scanning lines
Is transmitted as

Next, the video signal output from the line memory 1 is input to the interface formatter circuit 4. The interface formatter circuit 4 applies a digital synchronization signal for serial transmission such as EAV, line number, CRC, SAV, etc. to the video signal output from the line memory 1 in accordance with the horizontal and vertical timing signals of the interface output from the control circuit 2. Multiplexed, the number of scanning lines and the number of words in the active section per line, 1
Although the total number of words of the line is different, the format of the digital synchronization signal such as EAV, SAV, line number, CRC and the like is output in the same manner as the SMPTE292M and BTAS-004 standards. Except for the active section of the video signal output from the line memory 1, the horizontal and vertical blanking sections are set to the pedestal level. Also,
When multiplexing auxiliary data as in the HDTV system,
It is multiplexed into the horizontal and vertical blanking intervals.

With the above configuration, the 480 / 60I
Video signal of the HDTV system is converted to the transmission speed of the HDTV system,
It is possible to realize a transmission device that outputs with low delay without a significant change from the transmission device for the DTV system.

In the above description, the video signal of the 480 / 60I system has been described. However, the present invention can be similarly realized in other video systems. Taking the 480 / 60P system as an example, the video signal of the 480 / 60P system has 525 scanning lines.
In this case, the frame frequency is 60 / 1.001 Hz. Therefore, the number of scanning lines is 550, the number of words per scanning line is converted to 2250 words, and the transmission speed is 1.485 / 1.0.
What is necessary is just to transmit at 01 Gbps.

It is also possible to convert a plurality of SDTV video signals as described in the fourth embodiment into HDTV transmission speeds and output them.

[0077]

As described above, according to the present invention, the transmission rate of the HDTV system is converted by converting the transmission speed of the SDTV system having a relatively low transmission speed into a transmission speed near the HDTV system having a high transmission speed. It is possible to realize a transmission method or a transmission device capable of performing transmission of the SDTV system with a low delay without a significant circuit change from the device and the reception device.

According to the present invention, the SDTV video signal and the format of the HDTV video signal which have been converted to a transmission speed near the HDTV format and the format of the HDTV video signal are automatically detected, and the HDTV format and the HDTV format are automatically detected. It is possible to realize a receiving method or a receiving apparatus that enables the same apparatus to receive the SDTV system converted to a transmission speed or the like.

According to the present invention, an audio signal can be multiplexed and transmitted even for a video signal having more than 4096 words per scanning line.

Further, according to the present invention, the SDTV system multiplexing of a plurality of channels having a relatively low transmission speed is converted to a transmission speed near the HDTV system having a high transmission speed, and the transmission is performed. It is possible to realize a transmission device capable of transmitting a plurality of channels of the SDTV system with low delay and without significant circuit change from the device.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a transmission device according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of a 480 / 60I video signal format.

FIG. 3 is a timing chart showing an operation of the transmitting apparatus according to the first embodiment of the present invention.

FIG. 4 is a conceptual diagram of a transmission format obtained by converting a 480 / 60I video signal by the transmission device.

FIG. 5 is a block diagram showing a configuration of a receiving device according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing another configuration of the receiving apparatus according to the second embodiment.

FIG. 7 is a block diagram showing a configuration of an interface deformatter circuit of the receiving apparatus.

FIG. 8 is a schematic relationship diagram of various HDTV systems.

FIG. 9 is a schematic relationship diagram of various HDTV systems.

FIG. 10 is a schematic diagram of serial transmission of the HDTV system.

FIG. 11 is a timing chart showing the operation of the receiving apparatus according to the second embodiment of the present invention.

FIG. 12 is a schematic diagram showing the relationship between the outline of the BTA S-006 standard and audio clock phase information according to the third embodiment of the present invention.

FIG. 13 is a block diagram showing a configuration of a transmitting apparatus according to Embodiment 3 of the present invention.

FIG. 14 is a block diagram showing a configuration of a receiving apparatus according to the third embodiment.

FIG. 15 is a block diagram showing a configuration of a transmitting apparatus according to Embodiment 4 of the present invention.

FIG. 16 is a conceptual diagram of a transmission format when a 480 / 60I video signal is multiplexed on two channels according to the fourth embodiment.

FIG. 17 is a block diagram showing a configuration of a receiving apparatus according to a fourth embodiment of the present invention.

FIG. 18 shows 480 / 60I according to the fifth embodiment of the present invention.
Diagram of the transmission format converted from a video signal

FIG. 19 is a conceptual diagram of a transmission format obtained by converting a 480 / 60I video signal according to the fifth embodiment.

FIG. 20 is a timing chart showing the operation of the transmitting apparatus according to the fifth embodiment.

[Explanation of symbols]

 1, 6, 14, 15, 16, 17 Line Memory 2, 7 Control Circuit 3, 8 PLL 4 Interface Formatter Circuit 5 Interface Deformatter Circuit 9 Synchronization Detection Circuit 10 Horizontal Sample Number Detection Circuit 11 Blanking Start Line Detection Circuit 12 Timing Generation circuit 13 Format judgment circuit

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor, Yoshiaki Wada 1006, Kazuma, Kadoma, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd. (72) Inventor Murao Tsuguo 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference) 5C063 AA01 AA06 AB03 AB07 AC01 AC05 BA03 BA06 CA14 CA16 CA23 CA34 DB03

Claims (26)

[Claims] 1. A transmission method for extending a horizontal blanking period of an SDTV video signal, converting a transmission speed of the SDTV video signal to a value near a transmission speed of an HDTV video signal, and transmitting the converted video signal. 2. A transmission method in which a horizontal blanking period of an SDTV video signal is extended to a fixed value, and a transmission speed of the SDTV video signal is converted to a value near an HDTV video signal transmission speed and transmitted. 3. A video signal of the 480 / 60I SDTV system is converted into a signal having a number of samples per scanning line of a luminance signal and a color difference signal of 4714, and the transmission speed is converted to a value near the transmission speed of the video signal of the HDTV system. How to send. 4. A video signal of the 480 / 60I SDTV system is converted to a signal speed near the transmission speed of the HDTV system video signal by converting the number of samples per scanning line of the luminance signal and the color difference signal to 4715, and transmitting the converted signal. How to send. 5. A 480 / 60P SDTV video signal is converted to a transmission rate near the transmission rate of an HDTV video signal by setting the number of samples per scanning line of a luminance signal and a color difference signal to 2357. How to send. 6. A 480 / 60P SDTV video signal is converted to a transmission rate near the transmission rate of an HDTV video signal by setting the number of samples per scanning line of a luminance signal and a color difference signal to 2358. How to send. 7. A line memory for capturing an active section of an SDTV video signal, a PLL circuit for generating a clock having a frequency near transmission of an HDTV system from a clock of the SDTV video signal, and a video signal of the SDTV system A transmission apparatus comprising: a control circuit for controlling the line memory so as to capture and output an active section of a signal; and an interface formatter circuit for adding an output of the line memory to a digital synchronization signal of the HDTV system. . 8. A method for receiving a serialized and transmitted video signal, wherein the format of the serialized video signal is obtained from an EAV and a line number data of a digital synchronization signal of the serialized and transmitted video signal. Receiving method to detect automatically. 9. A method for receiving a serialized and transmitted video signal, wherein the format of the serialized video signal is determined based on a digital synchronization signal (SAV) of the serialized and transmitted video signal and line number data. Receiving method to detect automatically. 10. A method for receiving a serialized and transmitted video signal, comprising: using a digital synchronization signal EAV and SAV of the serialized and transmitted video signal.
A receiving method for automatically detecting a format of the serialized video signal. 11. A method for receiving a serialized and transmitted video signal, wherein the format of the serialized video signal is determined from EAV or SAV of a digital synchronization signal of the serialized and transmitted video signal. Receiving method to detect automatically. 12. A method for receiving a serialized and transmitted video signal, wherein the serialized video signal is obtained from EAV, SAV and line number data of a digital synchronization signal of the serialized and transmitted video signal. A receiving method that automatically detects the signal format. 13. The receiving method according to claim 8, wherein the serialized and transmitted video signal is a signal of the SMPTE292M standard or the BTAS S-004 standard. 14. An apparatus for receiving a serialized and transmitted video signal, comprising: a synchronization detection circuit for detecting a digital synchronization signal; and detecting the number of horizontal samples from the digital synchronization signal detected by the synchronization detection circuit. A horizontal sample number detection circuit, a blanking start line detection circuit for detecting a blanking start line from the digital synchronization signal, and an image transmitted from the detection results of the horizontal sample number detection circuit and the blanking start line detection circuit. A receiving device comprising: a format detection circuit that detects a format of a signal. 15. SMPTE 299M standard and BTA
A method of multiplexing and transmitting an audio signal in a horizontal blanking interval of a video signal according to the S-006 standard, wherein the number of words per one scanning line of the video signal exceeds 4096 in the horizontal blanking interval of the video signal. A transmission method in which the voice clock phase information of a voice packet is extended to 13 bits and transmitted when multiplexing and transmitting. 16. A multi-channel SDTV video signal is multiplexed, a horizontal blanking interval of the multiplexed multi-channel SDTV video signal is extended, and transmission of the multiplexed multi-channel SDTV video signal is performed. A transmission method in which the speed is converted to near the transmission speed of a one-channel HDTV video signal and transmitted. 17. A multi-channel SDTV video signal is multiplexed, and a horizontal blanking interval of the multiplexed multi-channel SDTV video signal is extended to a fixed value.
A transmission method for converting the transmission speed of the multiplexed multi-channel SDTV video signal to near the transmission speed of the one-channel HDTV video signal and transmitting the converted signal. 18. A 480 / 60I system S of two channels.
DTV video signals are multiplexed, and one of the multiplexed two-channel 480 / 60I SDTV video signals is
A transmission method in which the number of samples per scanning line is set to 4715, and the transmission speed is converted to a value near the transmission speed of an HDTV video signal and transmitted. 19. A two-channel 480 / 60I S
DTV video signals are multiplexed, and one of the multiplexed two-channel 480 / 60I SDTV video signals is
A transmission method in which the number of samples per scanning line is set to 4714, and the transmission speed is converted to a value close to the transmission speed of an HDTV video signal and transmitted. 20. Two-channel 480 / 60P S
DTV video signals are multiplexed, and one of the multiplexed two-channel 480 / 60P SDTV video signals is used.
A transmission method in which the number of samples per scanning line is 2357, and the transmission speed is converted to a value near the transmission speed of an HDTV video signal and transmitted. 21. Two-channel 480 / 60P S
A video signal of the DTV system is multiplexed, and one of the multiplexed two-channel 480 / 60P SDTV video signals is used.
A transmission method in which the number of samples per scanning line is 2358, and the transmission speed is converted to a value close to the transmission speed of an HDTV video signal and transmitted. 22. A plurality of line memories for capturing an active section of an SDTV video signal for each channel, a PLL circuit for generating a frequency near a transmission of an HDTV system from the video signal clock of the SDTV system,
A control circuit for controlling the plurality of line memories so as to capture and output an active section of a V-system video signal;
A transmission device comprising: an interface formatter circuit that multiplexes outputs of the plurality of line memories and adds the HDTV digital synchronization signal. 23. The SDTV video signal in which the horizontal blanking period and the number of scanning lines are extended to fixed values,
A transmission method of converting the transmission rate of a video signal of the HDTV system to the transmission speed of the HDTV system and transmitting the converted signal. 24. A 480 / 60I SDTV video signal, wherein the number of samples per scanning line of a luminance signal and a color difference signal is 4500, the total number of lines is 550, and the transmission speed is HDTV video signal transmission. Transmission method that converts to speed and sends it. 25. A 480 / 60P SDTV video signal, a luminance signal and a color difference signal are sampled per scanning line at 2250, a total number of lines is 550, and a transmission speed is HDTV video signal transmission. Transmission method that converts to speed and sends it. 26. A multi-channel SDTV video signal is multiplexed, the horizontal blanking interval and the number of scanning lines of the multiplexed multi-channel SDTV video signal are extended to fixed values, and the multiplexed multi-channel SDTV video signal is expanded. A transmission method for converting the transmission rate of an SDTV video signal to the transmission rate of a one-channel HDTV video signal and transmitting the converted signal.