JPH04364698A - Television telephone set terminal exchange system - Google Patents

Abstract

PURPOSE:To attain the communication between television telephone terminals with different communication speeds and to allow even a terminal equipment with a different communication speed to receive a multiple address function sending a same picture/audio signal to each terminal equipment simultaneously. CONSTITUTION:A picture/audio signal converter 8 applies speed conversion to a picture signal for a television telephone terminal and a television conference terminal or the like from a faster communication speed to a slower speed or vice versa, 1/n pattern for the former and n-multiple pattern for the latter without changing a picture image and converts an audio signal to a relative frequency allocated to the communication speed. A central controller 9 identifies the communication speed of the television telephone terminal sending/receiving a signal in the case of communication through a control channel (D channel in ISDN) different from a communication channel (B channel for ISDN) through which sending/receiving a picture/audio signal generated by the picture/audio signal converter 8 so as to attain the communication between television telephone terminals with different communication speeds.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video telephone terminal exchange system, and more particularly to a system for exchanging terminals with different communication speeds.

0002

2. Description of the Related Art In conventional videophone terminal exchange systems, only terminals with matching communication speeds are exchanged.

Next, a description will be given with reference to FIG. When the communication speeds of the videophone terminal 3 and the videophone terminal 4 are the same, the image and audio signals of the videophone terminal 3 are sent to the nth channel of the distributed time division switch 2, as shown in FIG. The video phone terminal 4 transmits the image/audio signal of the n+1 channel, the video phone terminal 3 receives the signal of the n+1 channel, and the video phone terminal 4 receives the signal of the n channel. Communication takes place between.

0004

[Problems to be Solved by the Invention] This conventional video telephone terminal exchange system does not allow communication between terminals with different communication speeds. Alternatively, a device was required to convert the communication speed for each terminal.

An object of the present invention is to provide a videophone terminal exchange system that enables communication between terminals with different communication speeds.

[0006]

[Means for Solving the Problems] The videophone terminal switching system of the present invention allows image signals of videophone terminals, videoconferencing terminals, etc. to be transferred from those having a high communication speed in an automatic exchange that performs distributed time-division switching. The former converts to a 1/n screen and the latter converts to an n times screen without changing the image image, and in addition, the audio signal is also converted to a relative value assigned to the communication speed. A communication channel (ISDN) is used to transmit and receive the image/audio signal generated by the image/audio signal converter to change the communication speed of the videophone terminal that makes and receives calls.
and a central control unit that identifies the network via a different control channel (D channel in ISDN) than the B channel in ISDN. It also has means for identifying the communication speed of the videophone terminal that makes and receives calls from the station data of the central control unit that is registered in advance for subscribers.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a system configuration diagram of an embodiment of the present invention. From videophone terminal 12 to videophone terminal 13
For example, suppose that the communication speed of the videophone terminal 12 is 128 kbps, and the communication speed of the videophone terminal 13 is 64 kbps. The automatic exchange 14 captures the image/audio signal converter 16 and converts the video phone terminal 1
The image and audio signals of 2 are converted to 64 kbps and sent to the videophone terminal 13 via the network and automatic exchange 15, and conversely, the image and audio signals from the videophone terminal 13 are converted to 64 kbps and sent to the videophone terminal 13 via the automatic exchange 15 and the network. Exchange machine 14
receives the image/audio signal using the image/audio signal converter 16;
It is converted to 8 kbps and sent to the videophone terminal 12. This allows communication between videophone terminals with different communication speeds.

Further, for example, assume that the communication speed of the videophone terminal 13 is 384 kbps, and the communication speed of the videophone terminal 12 is 128 kbps. When calling the video phone terminal 12 from the video phone terminal 13, the automatic exchange 15 uses the image/audio signal exchange device 17 to perform communication speed conversion processing in the same manner as described above, and calls the video phone terminal 13 and the video phone terminal 12. Connect the videophone terminal 12.

FIG. 2 is a relay system diagram of an embodiment of the present invention. A video telephone terminal 3 connected to an automatic exchange 1 dials the subscriber number of the video telephone terminal 4 after going off-hook. The central control device 9 tries to connect the videophone terminal 3 and the videophone terminal 4 using a known technique, but the communication speed of the videophone terminal 3 or the videophone terminal 4 at this time is
Confirmation is made via a control line (not shown). When the videophone terminal 4 responds, the central control device 9 connects the videophone terminal 3 and the videophone terminal 4 through the distributed time division switch 2.

At this time, if the communication speeds of the videophone terminal 3 and the videophone terminal 4 are the same, the image/audio signals of the videophone terminal 3 are transmitted in a distributed manner as shown in FIG. 4, as in the conventional method. The time division switch 2 sends the signal to the nth channel, the videophone terminal 4 transmits the image/audio signal to the n+1st channel, the videophone terminal 3 receives the signal from the n+1st channel, and the videophone terminal 4 receives the signal from the n+1st channel. Communication between videophone terminals is performed by receiving eye signals.

A case where the communication speeds of the videophone terminal 5 and the videophone terminal 6 are different will be explained with reference to FIGS. 2 and 3. The image and audio signals of the videophone terminal 5 are sent to the m channel of the distributed time division switch 2, and the image and audio signals of the videophone terminal 6 are sent to the s channel of the distributed time division switch 2, but the communication speed is Therefore, the central control device 9 captures the image/audio signal converter 8 and inputs the m channel, which is the signal of the videophone terminal 5, to the terminal 21 of the image/audio signal converter 8, for example, 1/n. The speed of the screen is converted without changing the image image, and the audio signal is also converted to a relative frequency assigned to the communication speed, and the terminal 22 of the screen/audio signal converter 8 is connected to the n-channel of the distributed time division switch 2. Sends the converted output to . The videophone terminal 6 receives n-channel signals. On the other hand, the s-channel signal, which is the signal from the videophone terminal 6, is input to the terminal 23 of the image/audio signal converter 8, and the speed of, for example, an n-times screen is converted without changing the screen image, and the audio signal is also converted to the communication speed. The distributed time division switch 2 changes from the terminal 24 of the screen/audio signal converter 8 to the assigned relative frequency.
The converted output is sent to the t-channel of . Videophone terminal 5
By receiving the T-channel signal, communication between the videophone terminals 5 and 6 having different communication speeds is performed.

Next, the connection between the videophone terminal 20 and the videophone terminal 5 of the network 10 shown in FIG. 2 will be explained. It is assumed that the communication speed of the video telephone terminal 20 of the network 10 is the same as that of the television terminal 6, and the following diagram is shown in Figure 3.
Explain with reference to.

Image/audio signals from the video telephone terminal 20 of the network 10 are received through the trunk 7 to the S channel of the distributed time division switch 2, and converted by the image/audio signal converter 8 to the television of the network 10. The signal from the telephone terminal 20 is received on the t channel of the distributed time division switch 2 and input to the videophone terminal 5. Further, the image/audio signal from the videophone terminal 5 is received on channel m of the distributed time division switch 2, and the signal of the videophone terminal 5 converted by the image/audio signal converter 8 is transmitted to the distributed time division switch 2. 2, and is input to the videophone terminal 20 of the network 10 via the trunk 7, and is carried out in the same manner as the communication between the videophone terminals 5 and 6 described above.

[0015] In this embodiment, a method has been described in which the central control unit identifies the communication speed of a videophone terminal via a control channel.
By storing the communication speed corresponding to videophone terminal subscribers in station data such as a trunk, it is possible to identify the communication speed without using a control line and establish a connection between videophone terminals in an automatic exchange. I can do it.

It is also known that distributed time division switching allows multipoint connections. According to the present invention, it is also possible to broadcast simultaneously to videophone terminals with different communication speeds. For example, in FIG. 3, the image/audio signals of the videophone terminal 5 are transmitted to a videophone terminal with a fast communication speed as an m-channel signal, to a videophone terminal with a slow communication speed as an n-channel signal, and further as shown in FIG. For videophone terminals (not shown) with slightly slower communication speeds, communication can be improved by using image/audio signal converters in parallel or by using an image/audio signal converter 8 equipped with multiple types of speed conversion circuits. It converts the video and audio signals into video and audio signals suitable for individual videophone terminals with different speeds, and connects the signal of that channel to each videophone terminal that you want to broadcast. This makes it possible to send the necessary images and audio to many videophone terminals.

[0017]

As explained above, the present invention identifies the communication speeds of the caller and the other party using the communication speed identification means provided in the central control unit of the automatic exchange, and the image/audio signal converter identifies the communication speed of the receiving terminal. By converting to a communication speed, there is an effect of enabling communication between videophone terminals having different communication speeds.

[0018] Furthermore, since distributed time-division switching is performed, the broadcast function that simultaneously sends the same image/audio to each terminal, such as a lecture by an executive within a company, has the effect that terminals with different communication speeds can receive it. be.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram of a relay system according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a method of using the distributed time division switch of the present invention.

FIG. 4 is a diagram illustrating how to use a conventional distributed time division switch.

[Explanation of symbols]

1, 14, 15 Automatic exchange 2 Distributed time division switch 3, 4, 5, 6, 12, 13, 20 Video phone terminal 7 Trunk 8, 16, 17 Image/audio signal converter 9
Central control device 10, 11 network

Claims (2)

[Claims] [Claim 1] In an automatic switching system that performs distributed time-division switching, image signals from video telephone terminals, video conference terminals, etc. are switched from fast to slow communication speeds, and vice versa. The former converts the image into a 1/n screen and the latter into an n times screen without changing the image image, and also converts the audio signal into a relative frequency assigned to the communication speed. The communication speed of the incoming videophone terminal is determined by the communication channel (IS) that transmits and receives the image/audio signal generated by the image/audio signal converter.
A control channel (ISD) that is different from the B channel in the DN
A videophone terminal switching system characterized in that it has a central control unit that identifies videophone terminals via a D channel (N and D channels), and enables communication between videophone terminals having different communication speeds. 2. Claim 1, further comprising means for identifying the communication speed of the videophone terminal making and receiving calls from station data of the central control unit registered in advance for subscribers.
Videophone terminal exchange method described.