Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1977-05-02
1978-07-04
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
179 2TV, 358143, H04N 714
Patent
active
040992020
ABSTRACT:
A system for transmitting and receiving both a slow scan television signal and a voice signal over a common communication channel is disclosed. The slow scan television signal includes horizontal sync pulses provided at a predetermined rate for defining a predetermined period. The horizontal sync pulse and video information for a video scan line are contained within a first portion of the predetermined duration.
A multiplexing device alternately connects either a video transceiver or an audio transceiver to the communication channel. The multiplexing device connects the video transceiver to the communication channel during the duration of a first multiplexing control signal and during the duration of a second multiplexing control signal.
The first multiplexing control signal is provided in response to the slow scan television signal provided by the video transceiver and has a duration corresponding to the first portion of the predetermined period. The second multiplexing control signal is provided in response to detection of a horizontal sync pulse in a video signal received from the communication channel and has a duration corresponding to the duration of the first multiplexing control signal. The first multiplexing control signal controls the multiplexing device when the video transceiver is in a transmit mode, the second multiplexing control signal controls the multiplexing means when the video transceiver is in a receive mode.
A gap of a predetermined duration is defined in the signals provided by the multiplexing means to the communication channel between each voice signal and each succeeding slow scan television signal.
REFERENCES:
patent: 2314471 (1943-03-01), Wright
patent: 3021384 (1962-02-01), Brown
patent: 3352966 (1967-11-01), Sawazaki et al
patent: 3974337 (1976-08-01), Tatsuzawa
Murray Richard
Orsino Jr. Joseph A.
Robot Research, Inc.
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