JPS6079887A - Communication system of remote television conference - Google Patents

Abstract

PURPOSE:To eliminate the feeling of dissidence of conversation due to the dissidence of a picture and voice by controlling a system that a voice delay circuit is inserted at the transmission of a portrate in transmitting a television picture on a satellite line and a voice signal on a ground line. CONSTITUTION:For example, a TV camera 11a photographs the entire scene of a conference room and a TV camera 11b photographs the portrates of the conference participants. When the camera 11b is selected by an image pickup picture designating signal I and a closeup image of a speaker is transmitted, the system is controlled that the voice delay circuit of a voice signal transmitter 15 is operated by the output signal of an image pickup pattern controller 17. Since the circuit is controlled that the amount of delay of the voice delay circuit is identical to the delay time of the satellite line, the movement of the mouth of the speaker and the voice are coincident at the conference room at the reception side thereby giving no feeling of disorder.

Description

[Detailed Description of the Invention] ['Industrial Field of Application] This invention relates to a remote video conference communication system for exchanging image information between remote points using communication satellites and conducting video conferences, etc. be.

[Background technology and its problems]

By using communication satellites, it is possible to simultaneously transmit and receive images and signals between widely spread points, making it possible to conduct international video conferences using satellite communication systems.

However, while satellite links have the advantage of being able to handle wideband signals, they also have the disadvantage of having transmission delays that can make conversations uncomfortable.

For this reason, a method has been considered in which the image signal is communicated via a satellite link and the audio signal is communicated via a terrestrial link, but such a method brings with it another discomfort due to the mismatch in the transmission times of the image and audio.

[Purpose of the invention]

This invention was made in view of the actual situation,
This is an attempt to eliminate the sense of discomfort in conversation due to voice transmission delay time and the sense of discomfort in conversation due to image/audio mismatch.

[Summary of the invention]

In order to achieve the above object, the present invention provides a delay circuit that has almost the same transmission time as the transmission time when transmitting a TV image signal via a satellite line, and controls this delay circuit in relation to the TV left camera control signal. Particularly, when the TV left camera is photographing a person's shoulder-top image, the delay circuit is inserted into the audio signal transmission circuit.

Therefore, when a close-up image of a person participating in a conference is transmitted, the participant's audio signal transmitted over the land line is automatically delayed, so on the receiving side, the speaker's mouth cannot be heard. You can watch the monitor TV with the movement and sound matching, and you will not feel any discomfort.

〔Example〕

FIG. 1 shows an outline of the remote teleconference communication system of the present invention, in which P surrounded by a dashed line indicates a facility in one conference hall, and Q indicates a facility in the other conference hall.

11a, 11b, and 11c are TV cameras installed on the side of the conference hall P. For example, the TV camera 11a is used to photograph a panoramic view of the conference hall, and the TV camera 11b is used to photograph portraits of conference participants. .

Furthermore, the TV camera 11C photographs discussion materials, articles, and the like.

12 is a television image transmitting and receiving device, and 13 is a monitor television showing the situation in the other party's conference hall (Q). In addition,
The number of monitor televisions 13 is not limited to one. 14a,
Microphones 14'b and 14c collect the voices of conference participants, and these microphones 14a and 14b
, 14c are sent to the other party's conference hall via an audio signal transmitter 15 having a built-in audio delay circuit. Further, 16 is an audio receiver that amplifies the audio signal transmitted from the conference hall of the other party and outputs the signal from a speaker.

Reference numeral 17 denotes a photographing screen control device which selects the TV cameras 11a to 11c to be transmitted by a photographing screen designation signal operator, and controls the delay circuit of the audio signal transmitter 15 at the same time as designating the transmission screen.

In addition, the facility Q of the conference hall on the other party's side also has TV cameras 21a to 21C1, image transmitting/receiving device 22, monitor television 23. Audio signal transmitter 25.Microphones 24a to 24C9 have built-in delay circuits. Audio receiver 26. A photographing screen control device 27 is installed.

The image transmitting/receiving device 12 (22) communicates with the communication satellite 30.
Send and receive image signals via.

Further, the audio signal is transmitted via a terrestrial line (such as a submarine cable) 40.

The remote video conference communication system of the present invention is configured by the above-mentioned equipment, so there are two conference halls (P,
In Q), the situation in the conference hall on the other side is provided to both parties through screen and audio, creating an atmosphere as if they were in one conference hall.

By the way, the communication satellite 30 is normally 35,900 meters above the earth's surface.
Since the one stationary at an altitude of Km is used,
When an image signal is transmitted from the facility P of the conference hall to the facility Q, there will be a delay time of several 100 m5 to about 1 degree.

Therefore, there is no problem when the TV cameras 11a and 11c are selected and a panoramic view of the conference hall or discussion materials are being transmitted, but for example, when the TV camera 11b is selected and images of conference participants on their shoulders are transmitted, close-up images are displayed. , if the mouth movements shown in the image signal do not match the audio signal being transmitted over the terrestrial line, creating a sense of discomfort in the other conference room.

However, in the remote video conference communication system of the present invention, when the TV camera 11b is selected by the shooting screen designation signal I and a close-up image of the speaker is transmitted, the audio signal is transmitted by the output of the shooting screen control device 17 (27). vessel 15
The audio delay circuit (25) is controlled to operate.

Since the delay amount of this audio delay circuit is controlled to be the same as the delay time of the security line, the speaker's mouth movements and voice match in the conference hall on the receiving side, eliminating any sense of discomfort.

However, when discussion materials and the like are transmitted as image signals, it is preferable for the delay time to be O or J from the viewpoint of smooth dialogue, so the audio delay circuit is controlled to be inactive.

[Effects of the Invention] As explained above, the remote video conference communication system of the present invention improves transmission efficiency by transmitting image signals by a communication satellite and transmitting audio signals by a terrestrial line. Since the delay circuit provided in the audio transmitter is controlled according to the image information, it can be particularly effective as a conference system between remote points.

[Brief explanation of the drawing]

The drawing is a block diagram showing an overview of the remote video conference communication system of the present invention. In the figure, 11a to 11c (21a to 21c) are TV cameras, 12 (22) is a TV image transmitting and receiving device, and 13 (
23) is a monitor TV, 14a-14cC24a-24
c) is a microphone, ] 5 is an audio signal transmitter with a built-in delay circuit, 16 is an audio receiver, 17 is a photographing screen control device, 30 is a communication satellite, and 4o is a ground line.

Claims (1)

[Claims] In a remote teleconferencing communication system in which television images are transmitted via satellite lines and audio signals are transmitted via terrestrial lines, when the TV left camera in the conference room is controlled to take a close-up image of a particular participating beach, A remote video conference communication system characterized in that the control signal controls the insertion of an audio delay circuit into a circuit that transmits an audio signal.