JPH0443731A - Television data multiplexing and demultiplexing system - Google Patents

Abstract

PURPOSE:To communicate television information and a data with multiplexing by replacing a vertical synchronizing signal of television information into vertical synchronizing signal identification information having a specific identification code, eliminating the vertical synchronizing signal and multiplexing the data from a terminal equipment to the caused void part. CONSTITUTION:A vertical synchronizing signal identification information generating means 14 receives digital television information outputted from an A/D conversion means 13 to detect a vertical synchronizing signal and the result is outputted to a multiplexer means 15 as vertical synchronizing signal identification information having a specific identification code. The multiplexer means 15 eliminates the vertical synchronizing signal from the television information and the vertical synchronizing signal identification information and the data are inserted to the void part caused by the elimination to make multiplexing. Moreover, the information for connecting and controlling the terminal equipment is extracted from the data of each terminal equipment 12, and information representing the multiplexing sequence of each data is added thereto to generate the control information and it is multiplexed with the vertical synchronizing signal identification information and the data and the result is sent to a transmission line 1 as a television data multiplex signal. Thus, a data is multiplexed to part of the television information and the result is sent.

Description

[Detailed Description of the Invention] [Summary] Regarding a multiplex communication system that performs communication by multiplexing television information and data on a transmission path, the purpose of this invention is to multiplex data into a part of television information and communicate. an analog/digital conversion means for converting the television signal output from the device into digital; and inputting the television information digitized by the analog/digital conversion means to detect a vertical synchronization signal and create vertical synchronization signal identification information. and inputs data from one or more terminals, television information from the analog/digital conversion means, and vertical synchronization signal identification information from the vertical synchronization signal identification information creation means, and outputs the vertical synchronization signal identification information. multiplexing means for removing the vertical synchronization signal from the information and inserting the vertical synchronization signal identification information, data, and control information for connection control into the removed portion, and transmitting the vertical synchronization signal identification information, data, and control information for connection control to the transmission path as a television data multiplex signal; In addition, a television data multiplex signal in which television information and data are multiplexed is received via a transmission path, vertical synchronization signal identification information included in the television data multiplex signal, television information from which the vertical synchronization signal has been removed, and control. demultiplexing means for demultiplexing information and data and distributing and outputting the data and control information to the corresponding one or more terminals; and the vertical synchronization signal identification information and the vertical synchronization signal are removed from the demultiplexing means. Vertical synchronization signal restoring means for inputting television information, restoring a digital vertical synchronization signal, inserting it into the television information from which the vertical synchronization signal has been removed, and outputting the same; and television information output from the vertical synchronization signal restoring means. The apparatus is configured to include digital/analog conversion means for converting the signal into analog and outputting the converted signal to the television receiver.

[Industrial application field]

The present invention relates to a multiplex communication system for multiplexing television information and data on a transmission path for communication.

With the recent development of l5DN (integrated service digital network), wideband l5 has expanded the band of information to be communicated.
Introduction of DN is being considered.

In broadband 15DN, by installing a broadband transmission line using optical fiber, which is becoming increasingly popular, between the exchange and the premises, it is possible to selectively connect and transmit extremely large amounts of information, such as digitized television information. Become.

When configuring a wideband 15DN using conventional technology, television information, audio information, data, facsimile (hereinafter referred to as FAX)
(denoted as ) information, etc. is digitally multiplexed in separate form and transmitted to the network side, but since the amount of information occupied by television information is much larger than other audio information and data, etc. The transmission line between the cable and the premises has a large margin when television information is not being transmitted, but when television information is being transmitted, there is a possibility that the transmission of other information will be compressed.

Therefore, on the transmission path where television information is transmitted,
There is a need for a television data multiplex communication system that can multiplex and communicate a portion of the television information with other data.

[Conventional technology]

FIG. 6 is a block diagram of a broadband 15DN system constructed according to the prior art, and FIG. 7 is a diagram illustrating a configuration for multiplexing television information and data according to the prior art.

In the house 31 there is a television transmitter and several terminals, namely:
FAX 12a, personal computer 12b, telephone 12
C, keypad 12d, etc. are installed. Among these terminals, those whose information is in analog format are converted from analog to digital by an analog/digital (A/D) conversion circuit and an encoder (not shown), encoded, and connected to the multiplexing circuit 34. There is. Further, the television information output from the television transmitter 11 is converted from analog to digital by an analog/digital (A/D) conversion circuit 13, encoded by an encoder (not shown), and multiplexed as in the terminals 12a to 12d. is connected to the conversion circuit 34.

When the above-mentioned terminals 12a to 12d communicate, they are multiplexed in the multiplexing circuit 34 and sent out to the transmission path 1a. Regarding an example of multiplexing with television information,
This will be explained below.

Television transmitter 11 and television receiver 2 in FIG.
If 1 is a high-definition television (hereinafter referred to as HDTV), the television information consisting of a synchronization signal and a video signal is, for example, 44
．． If sampling is performed at 55 Mb/s and digitally encoded at 8 bits, the amount of information to be transmitted is 4
4.55 xe', 3so Mb/s. In addition,
Since HDTV transmits 60 screens per second, the amount of information in one frame (one screen) is 360/60 or 6M bits.

FIG. 7 is a diagram for explaining the state in which the data input and output from each of the above terminals and the television information are multiplexed, and ■ to O in the diagram are the same symbols in FIG. 6. The waveform is shown. Although some control information is sent individually from each terminal, in FIGS. 6 and 7, only the control information for connection is sent from the keypad 12 to simplify the explanation.
d. All data from analog terminals are sampled at the same frequency of 8 kHz, or 0.125 ms, and encoded with 8 bits.
Assume that the data is kb/s, and that the data from the digital terminal is also the same <64 kb/s data.

Figure 7 ■ shows the waveform of television information that has already been digitally encoded, but one frame of HDTV television information is interlaced with two fields, an odd field and an even field, so the waveforms of both are slightly different. However, both are sent in two parts: a synchronization signal and a video signal. In a television receiver, vertical synchronization is established during the transmission time of the synchronization signal, and at the same time, vertical blanking of the television screen is performed.

When the television information is sent to the transmission path 1a according to the conventional technology, the unit of multiplexing the television information is, for example, one frame as one unit as shown in FIG. 7, or one unit of multiple frames (not shown). Therefore, it is natural to avoid dividing one frame.

As mentioned above, in HDTV, approximately 6 Mbits, which is one frame of TV information, is transmitted at a cycle of 1/60 seconds, so if it is transmitted without gaps between frames, approximately 3 Mbits per second is transmitted.
60 Mbits are transmitted. Therefore, transmission lines 1a, l
The information transmission speed of b is the information transmission speed of the television information 36
0 Mb/s, the transmission paths 1a and lb are occupied only by television information, and information other than television information cannot be multiplexed. In this case, in addition to the transmission path for television information, the terminal 12a In order to transmit the data of ~12d, it is necessary to prepare another transmission line or to increase the information transmission speed of the transmission lines 1a and lb for multiplexing.

■ in Fig. 7 is an example where a transmission line with an information transmission rate of 400 Mb/s, for example, is installed as an information transmission rate higher than the information transmission rate of 360 Mb/s required to transmit the television information on the transmission line 1a + lb. In this case, there is a margin of 400-360 = 40Mb/s in transmission capacity, so
It becomes possible to simultaneously transmit a large amount of data at, for example, 54 kb/s from the terminals 12a to 12d.

In ■ in FIG. 7, control information @ from the keypad 12d, FAX information [phase] from the FAX 12a, and the personal computer 12 as a data terminal are displayed between the frames of the TV information @.
The figure shows a state in which data [shares] from telephone 12c and audio information (2) from telephone 12c are each multiplexed with television information for two cycles (twice).

The multiplexed television information and data are sent to the exchange 1133 via the transmission line la, and the data of each terminal 12a to 12d is transmitted to the premises 32 or other premises not shown by the function (not shown) of the exchange 33. sent to. below,
The explanation will be made assuming that all the above information is sent to the home 32.

The multiplexed television information and data input from the exchange 33 to the home 32 via the transmission line 1b are sent to the demultiplexer circuit 3.
The television information that has been demultiplexed and digitally encoded in 5 is decoded in a decoder (not shown), and then converted into an analog signal in a digital/analog (D/A) conversion circuit 25 and sent to the television receiver 21. and output as a video. Further, as for other data, the control information is analyzed in the demultiplexing circuit 35, and each data is sent to the FAX 22a, the personal computer 22b or the telephone 2.
2c.

Note that although the transmitting side and the receiving side have been explained separately for convenience of explanation, the terminals in the home 31 and the home 32 may have a transmitting function and a receiving function.

As is clear from the above, when transmitting television information and data using the conventional technology, either a transmission path for transmitting television information and a transmission path for transmitting data are provided separately, or the information transmission speed of the transmission path is set to the transmission speed of television information. It is necessary to perform multiplexing at a higher level.

[Problem to be solved by the invention]

When transmitting television information and data using conventional technology,
It is necessary to provide separate transmission paths for transmitting television information and data, or to multiplex the information transmission speed of the transmission path higher than the transmission speed of television information, which increases the cost of transmission equipment. There is a problem in that it requires

An object of the present invention is to multiplex data into a part of television information and communicate the same.

[Means to solve the problem]

FIG. 1 is a diagram for explaining the multiplexing principle of the present invention, and FIG. 2 is a diagram for explaining the demultiplexing principle of the present invention.

In Figure 1, 1 is a transmission line, 11 is a television transmitter, and 12 is 1
or a plurality of terminals; 13 is an analog/digital (A/D) conversion means for converting the analog television signal outputted from the television transmission @ 11 into digital; 14 is a digital signal outputted from the analog/digital conversion means 13; 15 is one or more terminals 12; vertical synchronization signal identification information creation means inputs encoded television information, detects a vertical synchronization signal, creates and outputs vertical synchronization signal identification information;
input the data, the television information from the analog/digital conversion means 13, and the vertical synchronization signal identification information from the vertical synchronization signal identification information creation means 14, remove the vertical synchronization signal from the television information, and generate the removed portion. This is a multi-electrification means that inserts the vertical synchronization signal identification information, data, and control information for connection control, and sends it out to the transmission line 1 as a television data multiplexed signal.

In Figure 2, the same symbols are used for the same objects as in Figure 1, 21 is a television receiver, 22 is one or more terminals, 2
3 receives a television data multiplex signal in which television information and data are multiplexed via transmission path 1, and receives television information from which vertical synchronization signal identification information and vertical synchronization signal included in the television data multiplex signal are removed. , demultiplexes the control information and data, and analyzes the control information to transmit the data and information for terminal control to the corresponding one or more terminals 22.
The demultiplexing means 24 inputs the television information from which the vertical synchronizing signal identification information and the vertical synchronizing signal have been removed from the demultiplexing means 23, restores the digital vertical synchronizing signal, and outputs the digital vertical synchronizing signal. A vertical synchronization signal restoring means 25 inserts and outputs the vertical synchronization signal into the removed television information, and converts the digitized television information outputted from the vertical synchronization signal restoration means 24 into an analog television signal. This is digital/analog (D/A) conversion means for outputting to the television receiver 21.

[For production]

FIG. 1 is a diagram for explaining the multiplexing principle, and shows the basic configuration inside a transmitting side's home.

In FIG. 1, the television information outputted from the television transmitter 1ull consists of a synchronization signal part including a vertical synchronization signal (hereinafter simply referred to as a vertical synchronization signal) and a video signal part, and is transmitted from the television transmitter 11 to an analog television. Although it is output as a signal, it is converted into a digital signal by the analog/digital conversion means 13, and then encoded by means not shown and input to the multiplexing means 15.

Further, the vertical synchronization signal identification information creation means 14 inputs the digital television information outputted from the analog/digital conversion means 13, detects a vertical synchronization signal, and generates the vertical synchronization signal identification information having a specific identification code. It outputs to the multiplexing means 15.

One or more terminals 12 at the same time as transmitting the above television information.
When data is transmitted from the terminal 12, the data from the terminal 12 is also input to the multiplexing means 15.

When the multiplexing means 15 inputs digital television information from the analog/digital conversion means 13, vertical synchronization signal identification information from the vertical synchronization signal identification information creation means 14, and data from one or more terminals 12, the television information is inputted to the multiplexing means 15. The vertical synchronizing signal portion is removed from the signal, and multiplexing processing is performed on the transmission path using only the video signal as the multiplexing target.

Furthermore, the vertical synchronization signal identification information and data are inserted into a vacant part created by removing the vertical synchronization signal part and multiplexed. Also, at this time, information for connection and terminal control is extracted from the data from each terminal 12,
Information indicating the multiplexing order of each data is added to this to create control information, which is multiplexed with the vertical synchronization signal identification information and data and sent to the transmission line 1 as a television data multiplexed signal.

The television data multiplexed signal is sent to an exchange (not shown) via transmission line 1, and sent to the recipient's home via the exchange. explain.

FIG. 2 is a diagram for explaining the principle of demultiplexing, and shows the basic configuration of the receiver's house. 23 and is demultiplexed. The demultiplexed television information is output to the vertical synchronization signal restoration means 24 with the vertical synchronization signal portion removed, but at this time, the vertical synchronization signal restoration means 24 receives the vertical synchronization signal input from the demultiplexing means 23. Television information in which a vertical synchronization signal digitally encoded using identification information is restored, and the vertical synchronization signal portion is removed from the restored vertical synchronization signal, that is,
The video information is connected and output as digital television information to the digital/analog conversion means 25. The digital/analog conversion means 25 converts the received digitally encoded television information into an analog television signal and outputs it to the television receiver 1121 to output it as a video.

Further, the demultiplexing means 23 identifies the arrangement of multiplexed data by analyzing the control information included in the television data multiplexed signal, and outputs each data to the corresponding one or more terminals 22. At this time, information for terminal control included in the control information is also output to the corresponding terminal 22 along with each data.

As described above, in the configurations shown in FIGS. 1 and 2, since the vertical synchronization signal is removed from the television information and the data from the terminal 12 is inserted into the empty space and multiplexed, only the television information is It becomes possible to multiplex and communicate data while maintaining the information transmission capacity of the transmission path that is originally required for transmission.

〔Example〕

Fig. 3 is a configuration diagram of an embodiment of the present invention, Fig. 4 is an IDT
FIG. 5 is an explanatory diagram of the television data multiplexing configuration of the present invention.

The same symbols are used for the same objects throughout the figures.
a, lb are transmission paths, 2 is an exchange, 10 is inside the sending side's home, 20 is inside the receiving side's home, 12a = 12d and 22a
~22d are terminals, that is, 12a and 22a are facsimile machines (FAX), and 12b and 22b are personal computers (
PC), 12c, 22c are telephones, 12d, 22d
is a keypad.

In addition, ■ and ■ to ■ in FIG. 3 indicate output locations of each piece of information shown in FIG. 5. Hereinafter, FIGS. 3 to 5 will be explained.

FIG. 3 shows an embodiment based on the principle of FIGS. 1 and 2 facing each other, and FIG. 4 shows an analog television (HDTV) output from the television transmitter 11 in FIG. 3.
Shows the signal waveform.

As explained in the prior art (see FIG. 7), the television signal of one screen (one frame) of HDTV has an interlaced format in which it is divided into odd fields and even fields and transmitted alternately.

Although the signal configurations of the odd and even fields are slightly different, FIG. 4 shows the signal configuration of the odd field as an analog waveform.

As is well known, the number of scanning lines of HDTV is 1125, and in FIG. 4, the horizontal scanning period is indicated by the symbol "H".

The odd field consists of 562H, and as shown in FIG. 4, 45H of the 562H is used for the synchronization signal and 517H is used for the video signal. The television receiver detects the vertical synchronization signal during 45H of this synchronization signal, but this period also serves as a vertical synchronization retrace period. For this reason, 45
H time is required, but when transmitting a digitized television signal, short information indicating the presence of a vertical synchronization signal, for example 8-bit information, is sent, and the receiving side receives this information. By digitally restoring the waveform between 45H of the synchronization signal and connecting digital video information to the restored synchronization signal, all television information can be accurately restored as digital information. By decoding this digital television information into an analog signal, an analog television signal can be reproduced. The above-mentioned 45H time is approximately 0.67 m5, and since 60 frames are transmitted twice per second per frame, it occupies a total time of approximately 80 m5 per second, but it is used to transmit digitized television information. The information transmission speed required for this purpose is about 360 Mb/S, so if the 80 m5 of time is used for other information transmission, about 28 Mbits of information can be sent.The present invention focuses on this point. This is what I did.

In FIG. 3, the analog television signal output from the television transmitter 11 is sampled at, for example, 44.55 MHz in the analog/digital conversion circuit 3 and converted into digital information, and converted into 8-bit information by an encoder (not shown). The signal is encoded and input to the multiplexing circuit 15. ■ in FIG. 5 indicates digitally encoded television information. The vertical synchronization signal identification information creation circuit 14 receives the digitally encoded television information, detects a vertical synchronization signal, and outputs it to the multiplexing circuit 15 as vertical synchronization signal identification information having a specific identification code.

At this time, it is assumed that at the same time as the television information is transmitted, information is transmitted from a plurality of terminals installed in the home 10, such as the FAX 12a, the personal computer 12b, the telephone 12c, and the keypad 12d. Among these terminals, those whose information is in analog format are subjected to analog/digital conversion by an A/D conversion circuit and an encoder (not shown), encoded, and input to the multiplexing circuit 15. It is assumed that the data from each terminal is 64 kb/s data, in which 8 bits of information are sent every 0°125 s, as shown in (1) to (4) in Fig. 4. In addition to the connection information input from the keypad 12d, the control information ■ also includes other control information to be described later on the multiplexing circuit 1.
It shall be mixed within 5.

As described above, the multiplexing circuit 15 receives the digital television information, vertical synchronization signal identification information, control information, and data, and first removes the vertical synchronization signal that can be replaced by the vertical synchronization signal identification information from the television information. This is to replace the television information with a signal such as that shown in (2) in FIG. 5, and to free up a vertical synchronization signal portion.

Next, the multiplexing circuit 15 inserts the vertical synchronization signal identification information (Fig. 5 ■), control information (Fig. 5 ■), and data (Fig. 5 ■ to ■) into the vacant vertical synchronization signal portion. and multiplex it. At this time, the vertical synchronization signal identification information is inserted multiple times, for example, three times as shown in FIG. 5, in case identification fails on the receiving side. In addition, the above-mentioned information and information on the order in which data is multiplexed are added to the control information, and the information is transmitted to the relay exchange 2 or the receiver's premises 20.
Enable data identification. 5 is an example of the configuration of a television data multiplex signal in which the above information and data are multiplexed.

The television data multiplexed signal is sent to the exchange 2 via the transmission line 1a, and the control information is extracted by a function (not shown) of the exchange 2, and the destination of each information and data is analyzed. The information is then reconfigured and sent to the home 20 or another home not shown. The following description will be made assuming that all of the above information and data are sent to the home 20.

The television input from the exchange 2 via the transmission path 1b
The data multiplexed signal is input to a demultiplexing circuit 23 and demultiplexed. First, the television information is outputted to the vertical synchronization signal restoration circuit 24 as a digital video signal with the vertical synchronization signal portion removed. The vertical synchronization signal restoring means 24 simultaneously inputs vertical synchronization signal identification information from the multiplexing/demultiplexing circuit 23, and when the vertical synchronization signal identification information is identified, reads out the vertical synchronization signal stored in advance in the form of digitally encoded information. After the output is completed, the digitally encoded video signal received from the demultiplexing circuit 23 is output. That is, the vertical synchronization signal is restored using the vertical synchronization signal identification information and combined with the video signal,
It is output as digitally encoded television information.

The output TV information is decoded by a decoder (not shown) and then converted to a digital/analog conversion circuit 25.
The signal is input to the television receiver 21 as an analog television signal waveform as shown in FIG. 4, and is output as a video.

Further, the demultiplexing circuit 23 identifies the output light of the multiplexed data by analyzing the control information included in the television data multiplexed signal, and sends each data to the corresponding terminal 22.
Output to a to 22d. At this time, information for terminal control included in the control information is also output to the corresponding terminals 22a to 22d together with each data.

Although one embodiment of the present invention has been described above with reference to FIGS. 3 and 5, FIGS. 3 and 5 are only one embodiment of the present invention, and the configuration for realizing the present invention is Various configurations other than those shown in FIG. 3 are possible. For example, it is also possible to use a dedicated circuit for constructing control information, or to connect a type of terminal not shown in the drawings to achieve the same effect.

Furthermore, terminal data is not limited to 64 kb/s, and many configurations other than those shown in Fig. 5 are possible for multiplexing television data. It is also possible to multiplex the data; the invention does not exclude variations in the configuration of these functions and in the method of multiplexing the television data.

〔Effect of the invention〕

As explained above, according to the present invention, the vertical synchronization signal of television information is removed by replacing the vertical synchronization signal with vertical synchronization signal identification information having a specific identification code,
In order to multiplex data from the terminal into the empty space created by this, TV information and data can be multiplexed and communicated without increasing the information transmission capacity of the transmission path, which is originally necessary to transmit only TV information. This greatly contributes to improving the multiplexing efficiency and economicalization of transmission paths in broadband TSDN and the like.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the multiplexing principle of the present invention, FIG. 2 is an explanatory diagram of the demultiplexing principle of the present invention, and FIG. 3 is a diagram of the configuration of an embodiment of the present invention.
FIG. 4 is an explanatory diagram of the HDTV signal configuration, FIG. 5 is an explanatory diagram of the television data multiplexing configuration of the present invention, FIG. 6 is a configuration diagram of the prior art, and FIG. 7 is an explanatory diagram of the television data multiplexing configuration of the prior art. It is a diagram. In the figure, 1 ------1 transmission line 11・------1
-TV transmitters 12, 22 ・-・・One terminal 13・・−・・−1−−−−−−−−−−−−−−・−
・-Analog/digital conversion means 14・・・・−−−−−−−−−−・・・−・
・-Vertical synchronization signal identification information creation means 15-11・−・−・・−・・−−1−−−−−−・
---Multiplexing means 21--m-----
・・・・〜・・・・・・TV receiver 23・・・・−
··························································································································································.
・−Vertical synchronization signal restoration means 25−・−−−−−・−・−
. . . - Song digital/analog conversion means.

Claims (1)

[Claims] 1. In a multiplex communication system that performs communication by multiplexing television information transmitted and received between television transmitters and receivers and data transmitted and received between terminals on a transmission path, an analog output from a television transmitter (11) an analog/digital conversion means (13) for converting the television signal into digital; and inputting the digitized television information outputted from the analog/digital conversion means (13) to detect a vertical synchronization signal and convert the vertical synchronization signal into a digital signal. vertical synchronization signal identification information creation means (14) that creates and outputs signal identification information; data from one or more terminals (12); said television information and said vertical synchronization signal from said analog/digital conversion means (13); The vertical synchronization signal identification information is input from the identification information creation means (14), the vertical synchronization signal is removed from the television information, and the vertical synchronization signal identification information, data, and control information for connection control are added to the removed portion. A television data multiplexing system characterized by comprising a multiplexing means (15) for inserting a television data multiplexed signal and sending it out to a transmission line (1) as a television data multiplexed signal. 2. In a multiplex communication system that performs communication by multiplexing TV information sent and received between TV transmitters and receivers and data sent and received between terminals on a transmission path, a TV data multiplex signal in which TV information and data are multiplexed is transmitted over a transmission path. (1), and demultiplexes the vertical synchronization signal identification information, television information from which the vertical synchronization signal has been removed, control information, and data included in the television data multiplexed signal, and analyzes the control information. data and information for terminal control to one or more applicable terminals (2
2), which inputs the television information from which the vertical synchronization signal identification information and the vertical synchronization signal have been removed from the demultiplexing means (23), and outputs the digital vertical synchronization signal. vertical synchronization signal restoring means (24) for restoring and inserting the vertical synchronization signal into the television information from which it has been removed, and outputting the digitized television information output from the vertical synchronization signal restoring means (24); The television receiver (21) converts it into an analog television signal.
A television data multiplexing and demultiplexing system characterized by comprising a digital/analog conversion means (25) for outputting data to a digital signal.