JPH03273745A - Off-talk service system - Google Patents

Abstract

PURPOSE:To transfer sound and picture information by the digital signals of 64kb/s by exchanging the digital signals between a subscriber's private side and an intra-office side during the idle time of a subscriber line. CONSTITUTION:A subscriber's private off-talk means 5 is connected to the subscriber's private 20 side of the subscriber line in an existent exchange, and an intra-office off-talk means 6 is connected to the intra-office 22 side. Then, digital transmitters 7 and 8 are respectively connected to the both means 5 and 6 and the idle state of the subscriber line is detected by these off-talk means 5 and 6. The idle use terminal on the subscriber's private 20 side sends a channel number to the intra-office 22 side and an information receiving and extracting means 9 to be connected to the digital transmitter 8 on the intra- office 22 side extracts the correspondent information out of the plural kinds of information to be supplied from an information present center 13 and sends the information to the subscriber's private 20 side. In such a way, various information service including pictures and sounds can be presented by utilizing an analog line. Thus, the terminal of the off-talk service can selectively receive the information service of various media with pictures and sounds by the digital transmission of 64kb/s.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention uses existing metallic telephone subscriber lines to
This invention relates to digital communication services that provide digital transmission services when telephone lines are not in use.

(Prior art) As a conventional off-talk service, Japanese Patent Application Laid-Open No. 63-947
No. 59, ``Telecommunication line free time slot communication service system,'' and Japanese Patent Application Laid-Open No. 1983-302689, ``Telecommunication line idle time slot communication control system.''

Examples of services similar to conventional off-talk services include captain service and CATV, but off-talk services are limited in content because they are audio-only services. The Captain Service is also a service in the analog telephone band, so the transmission speed is slow, and the screen display and response are also slow, making it extremely inconvenient to use from a user's perspective. Furthermore, for CATV, subscriber lines must be installed independently, which requires a large amount of capital investment.

As described above, existing similar services have various problems, and since there has been no truly convenient, user-friendly, and low-cost information service, they have not been widely popularized.

(Problem to be solved by the invention) Since the conventional off-talk service is a telephone band service, there are limits to the service content, and it is impossible to send and receive 64Kb/s digital signals over digital subscriber lines. The disadvantage is that it cannot meet the demands of communication services.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and provide an off-talk service system that transfers audio and image information using 64 Kb/s digital signals.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides an off-talk service that is provided in the premises and at the telephone office at both ends of the subscriber line of the exchange, and detects when the subscriber line is vacant. An in-home off-talk means and an in-office off-talk means for connecting lines, a digital transmission device that connects to the in-home off-talk means and sends and receives digital signals to the subscriber's line, a terminal that sends and receives information including voice and images, and a terminal interface for digital transmission. It has an inkface means for converting into a human output interface of the device, and a digital transmission device that is connected to the in-office off-talk means and sends and receives signals to and from the in-house digital transmission device.
+ transmits and receives digital signals within the station.

(Function) According to the present invention, an in-home off-talk means is connected to the inside of the subscriber line of an existing exchange, an in-office off-talk means is connected to the inside of the office, and a digital transmission device is connected to both means, respectively. A vacant subscriber line is detected by the means. The idle terminal in the home (ill) sends a channel number to the inside of the office, and the information reception and extraction means connected to the digital transmission equipment inside the office extracts the relevant information from among multiple types of information supplied from the information provision center. It is possible to provide a variety of information services, including images and audio, by sending the information to the premises and using an analog line.

(Embodiment) Next, an embodiment of the digital off-talk service system according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention enables 64Kb/s digital transmission when the telephone is not in use by connecting a simple digital transmission device and an existing off-talk circuit to both the terminal side and the station side of the metallic line of the existing telecommunications network. It is possible to provide various information based on

FIG. 1 shows an embodiment in which the digital off-talk service of the present invention is applied to a telephone communication network. An in-home off-talk circuit 5 and an in-office off-talk circuit 6 are connected to the telephone office 22, and digital transmission devices 7.8 for performing bidirectional digital transmission at 64 Kb/s are connected to these circuits, respectively.

A terminal 12 is connected to the transmission device 7 on the terminal side via a terminal adapter 11. Inside the office, an information consultation extraction device 9 is connected.

An information receiving and distributing device 10 is connected to the device 9 for receiving information from an information provider or an information providing center 13 and distributing it to all the information receiving and extracting devices 9 within the same station.

The information providing center 13 time-division multiplexes a plurality of pieces of information and transmits the multiplexed information onto optical transmission lines connected to each telephone office. The multiplexed information is received by the information receiving and distributing device 10 and distributed to the information receiving and extracting device 9 installed for each line. Therefore, all the multiplexed information is constantly supplied to the information receiving and extracting device 9. On the other hand, on the subscriber side, a specific channel number to be obtained from among the multiplexed information is sent to the terminal 12.
More human power. This signal is transferred from the terminal adapter 11 to the information receiving and extracting device 9 via the digital transmission device 7, the in-home off-talk circuit 5, the in-office off-talk circuit 6, and the digital transmission device 8. The information reception and extraction device 9 extracts the information of the corresponding channel from all the multiplexed information mentioned above, and sends it to the digital transmission device 8 and the in-office off-talk circuit 6.
The data is transmitted to the subscriber line l at a transfer rate of 64 Kb/s. The sent information is transferred to the terminal adapter 11 via the home off-talk circuit 5 and the digital transmission device 7, and the terminal adapter 11 sends the received information to the terminal 12 in accordance with the terminal ink face. As a result, terminal 12
For example, information is displayed on home televisions, computers, etc.
Subscribers can instantly obtain desired information.

By the above method, a 64 Kb/S digital transmission service can be transferred without going through an exchange.

For example, a color still image can be displayed on one screen in about 8 seconds, so it is thought that providing a wide variety of services such as housing information, shopping information, and travel information will satisfy users. .

FIG. 2 is a functional block diagram of the internal circuit for the subscriber circuit in the telephone office 22 of FIG. 1, and the same numbers as in FIG. 1 indicate the same devices. When the in-office off-talk circuit 6 detects that the subscriber line 1 is vacant from the idle/busy detection circuit 30, it operates relay contacts at and a2, and connects the subscriber line l and the subscriber circuit 4 to the digital transmission device 8, i.e. Digital line station terminal equipment [Switch to simple OCU+ connection. The OCU converts the information selection code sent from the terminal side into serial/parallel data and sends it to the high-level data link controller (
Output to HDLCI 34. The H port LC 34 sends the channel number to the channel selection control circuit 36, and the circuit 36 causes the clock generation circuit 37 to output a clock pulse corresponding to the channel number. The channel selection circuit 32 has a shift register, which receives the clock pulse from the clock generation circuit 37, extracts information on the corresponding channel, and sends it to the channel selection circuit 32. Same circuit 3
2 extracts information on a predetermined channel from the multiplexed signal from the information center received from the highway by the information receiving circuit 38 and outputs it to the OCU 8. OCU 8 sends this extracted data to subscriber line 1 at 64 Kb/s.

FIG. 3 is a functional block diagram of the circuit in the home 20 of FIG. 1, and the same numbers as in FIG. 1 indicate the same devices. When the in-home off-talk circuit 5 detects that the subscriber line 1 is vacant from the idle/busy detection circuit 20, it switches the switching relay b1. b2 is activated, and the connection between the subscriber line 1 and the analog telephone 2 is switched to the connection with the digital transmission device 7, that is, the line termination device (simple DSUI). Output to adapter 11.High-level data link controller (H
DLC) 22 converts the signal from the simple DSU 7 into serial/parallel data and outputs it to the bus 23. Graphic control circuit (GC
) 25 stores the data on the bus 23 in a video memory (VRAM).
Once stored in the I 24 and an image frame of the terminal 12 is formed, it is output to the TV monitor of the terminal 12. As a result, the TV monitor 12 displays a still image from the information providing center. Also, the audio data from bus 23 is
It is converted into an analog audio signal by the D converter 27 and the T
The signal is sent to the V monitor 12 and becomes audio. The above image/audio data transmission is performed under the control of a microcomputer (μCOM+26).

Transmission of the channel number and transmission information from the terminal 12 is as follows:
This is carried out from the personal computer 12 through the HDLC 22, and the personal computer 12 also performs two-way communication with the information providing center and other terminals.

(Effects of the Invention) According to the present invention, by using 64 Kb/s digital transmission, an off-talk service terminal can select and receive information services of various media using images and sounds, and can also receive two-way communication using a personal computer. can be done. Since this information service is provided using idle time that is longer than the original communication time of the subscriber line, it is effective in making full use of the resources of the switching network.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of the off-talk service system according to the present invention, FIG. 2 is a functional block diagram of the in-office circuit of FIG. 1, and FIG. 3 is a functional block diagram of the in-house circuit of FIG. 1. main . Summary explanation 501, In-home off-talk circuit 6110 In-office off-talk circuit 1 Digital transmission device Information reception extraction device Information reception distribution device Terminal Agebuta terminal information provision center

Claims (1)

[Scope of Claims] 1. In-premises off-talk means and in-office off-talk means that are provided in the premises and at the telephone office at both ends of the subscriber's line of the exchange, and detect the availability of the subscriber's line and draw in the line; and the in-premises off-talk means. a first digital transmission device that is connected to the subscriber line and transmits and receives digital signals to the subscriber line; a terminal that receives or transmits and receives information including audio and images; and an interface of the terminal that is connected to the input of the first digital transmission device. It has an interface means for converting into an output interface, and a second digital transmission device that is connected to the in-office off-talk means and that sends and receives signals to and from the first digital transmission device, and the second digital transmission device is connected to the in-office off-talk means and transmits and receives signals to and from the inside of the premises during the idle time of the subscriber line. An off-talk service system characterized by transmitting and receiving digital signals within the station. 2. The system according to claim 1, comprising: an information center that transmits a plurality of types of information; an information receiving and distributing means provided in each telephone office that receives and distributes information from the center; and the digital transmission device. information receiving and extracting means for extracting the corresponding information from the distribution means and inputting it to the digital transmission device when the information channel number is received from the terminal, and the terminal selects and receives the information. This off-talk service method is characterized by: 3. The off-talk service method according to claim 1 or 2, wherein two-way communication is performed between the terminal, the information center, and other terminals.