JPH03266882A - Remote place educational system - Google Patents

Abstract

PURPOSE:To prevent noise from being generated at the time of switching a speaking station in the system which consists of a studio station and plural remote stations by cutting off a voice for a certain period right after an instruction when the studio station sends a transmission instruction to a remote station which makes a request to speak. CONSTITUTION:A voice selection control part 11 is added to the studio station 9 and remote stations 10 of a conventional educational system. The studio station 9 gives the right of speaking to the remote station 10 which makes the request to speak through a communication line (b). The image and voice of the remote station 10 which is given the right begin to be sent to all stations through a communication line (a). At the time of this switching, the transmitters 1 of the respective stations send data errors before frame synchronism is established and they are reproduced as a noise through a speaker 6, so each station when receiving switching information sends a voice selection signal (i) to the voice selection control part 11 so as to preclude the noise generation, thereby cutting off the voice for several seconds.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a remote education system for communicating in television education between remote locations.

[Conventional technology]

FIG. 3 is a block diagram illustrating a conventional distance education system.

One studio station 9 and a plurality of remote stations 1o are connected so that bidirectional/multipoint communication of video signals, audio signals, and control signals can be performed. The audio signal e from the microphone 7 is multiplexed by the transmission device 1 and transmitted to all the remote stations 1o, and the control signal g is also transmitted from the studio station 9 to all the remote stations 1o. When a speech request is made by the request unit 4 at a certain remote station 1o, the speech request signal is transmitted to the switching unit 3 of the studio station 9 via the communication line, and the studio station 9
When the lecturer at the station selects the speaking request destination using the switching unit 3, the remote station 1o is permitted to speak. A control signal g' is transmitted from the control section 2 to the transmission device section 1, and the video signal f' and the audio signal e' are multiplexed by the transmission device 1 and transmitted to all stations.

[Problem to be solved by the invention]

The above-described conventional distance education system has the disadvantage that data errors caused by frame synchronization in the transmission device 1 are played back on the speaker when switching between transmitting stations, making it difficult to hear.

[Means to solve the problem]

The system of the present invention includes a transmission device that multiplexes and bidirectionally transmits both video and audio signals between one studio station and a plurality of remote stations, and a communication line that allows multipoint transmission between the transmission devices. a control unit that bidirectionally transmits and receives control signals between the studio station and the remote station; a communication line that allows multipoint transmission between the control unit; and close call control of audio signals from the own and other stations. a voice selection control section for making a speech request, a speech requesting section for making a speech request, and a switching section for issuing a transmission command from the studio station to the specified remote station; Control is performed to cut off the audio signal during a preset period immediately after the transmission command.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. In the figure, one studio station 9 and multiple remote stations 10
is connected to a communication line a that can transmit video and audio to multiple points in both directions, and a communication line that can transmit control signals to multiple points in both directions. A video signal from a television camera 8 and an audio signal e from a microphone 7 are transmitted from a studio station 9 to each remote station 1 via a communication line a multiplexed by a transmission device 1.
Transmitted to 0. Then, the signals are separated by the transmission device 1 of the remote station 10 receiving the data, and the video is output to the monitor 5 and the audio is output to the speaker 6, respectively, and the students at each remote station 10 receive the video and teaching materials of the instructor at the studio station 9. ing.

If you have any questions about the content of the lecture, please call remote station 10.
When the requesting unit 4 makes a request to speak, a speaking request signal is transmitted to the switching unit 3 via the communication line, and the instructor at the studio station 9 is notified of the request to speak at the remote station 10. In response, the instructor at the studio station 9 switches the transmitting station using the switching unit 3 to give the remote station 10, which has requested to speak, the right to speak via the communication line, and also transmits this information. , 0 that can be communicated to all stations
Next, the video and audio of the remote station 10 that has been given the right to speak begins to be transmitted to all stations, but at the time of this transmission switch, the transmission device 1 of each station sends out a data error during the period until frame synchronization is established. do. In order to prevent this from being reproduced as noise from the speaker 6, each station sends a voice selection signal 1 from the control section 2 to the voice selection control section 11 when receiving the switching information to issue a command to cut off the voice for several seconds. After a few seconds, the control unit 2 releases the audio cutoff command to the audio selection control unit 11, and the remote station 10
The message from is sent to all stations.

FIG. 2 shows a timing diagram of this embodiment. When the transmission switching timing is instructed by a transmission switching signal accompanying speech permission, the transmission device 1 of each station transmits a data error (out-of-synchronization noise) during a period Tl until frame synchronization is established.

At each station, the period B T 2 specified by the audio selection control signal i
This prevents noise from being heard from the speaker 6 by blocking audio transmission from the speaker 6.

〔Effect of the invention〕

As explained above, in the present invention, by blocking the noise that occurs every time the speaking station changes, the lecturer and the students can quickly start a conversation, and the lecture can proceed smoothly. There is an effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a timing diagram showing the operation of an embodiment of the present invention, and FIG. 3 is a block diagram showing a conventional system. 161. Transmission device, 2...control unit, 3...switching unit,
4... Request unit, 5... Monitor, 6... Speaker, 7... Microphone, 8... Television camera, 9... Studio station, 10... Remote station, 11... Audio selection control section.

Claims (1)

[Claims] A transmission device that multiplexes and bidirectionally transmits both video and audio signals between one studio station and a plurality of remote stations, a communication line that allows multipoint transmission between the transmission devices, and the studio station and the plurality of remote stations. a control unit that bidirectionally transmits and receives control signals to and from the remote station; a communication line that allows multipoint transmission between the control units; and an audio selection control unit that controls connection and disconnection of audio signals from the own and other stations. , a speech requesting section for making a speech request, and a switching section for issuing a transmission command from the studio station to the specified remote station; A remote education system characterized by controlling audio signals to be cut off during a set period.