Multiplexed transmission system of image data from two or more s

Details Multiplexed transmission system of image data from two or more s Multiplexed transmission system of image data from two or more s

1991-12-20

1993-10-12

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358108, H04N 718, H04N 713

Patent

active

052530574

ABSTRACT:
A transmission system is provided having a sender side apparatus, a receiver side apparatus, and a transmission line connecting the sender and receiver side apparatuses. The sender side apparatus provides a selector for receiving image data signals of a plurality of channels in parallel and, frame by frame, selects an image data signal of one of the plurality of channels for each frame. The selector discards the image data signals of the other of the plurality of channels. A coding unit codes the image data signal which is selected for each frame by the selector, by interframe difference coding. A monitoring unit monitor data amounts of interframe differences in the image data signals of the respective channels. A control unit determines which one of said plurality of channels is to be selected by the selector, based on the data amounts of interframe differences in the image data signals of the respective channels, and adaptively controls the selector in accordance with this determination. Channel information is generated indicating the above one of the channels determined by the control unit for each frame. Frame by frame, the image data signal coded by the above coding means is transmitted, together with the above channel information corresponding to the coded image data signal. The receiver side apparatus receives the transmitted image data signal, together with the channel information, and a unit for decodes the received image data signal for each frame.

REFERENCES:
patent: 4337481 (1982-06-01), Mick et al.
patent: 4485402 (1984-11-01), Searby
patent: 4673974 (1987-06-01), Ito et al.
patent: 4710813 (1987-12-01), Wallis et al.
patent: 4827336 (1989-05-01), Acampora et al.
Patent Abstracts of Japan, Kokai No. 1-239389, Sep. 22, 1989, p. 91 E862.

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