Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1979-10-10
1982-02-23
Britton, Howard
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358140, 358171, 455 42, H04N 718
Patent
active
043171303
ABSTRACT:
A television transmission system for asynchronously transmitting a television picture as a plurality of video samples over a narrow bandwidth medium from at least one remote transmitting site to a receiver at a base station. Improved synchronization between the transmitter and receiver are achieved by a dotting pattern consisting of alternating logic ones and zeros being sent by the transmitter to precede the video samples such that a sampling clock at the receiver synchronizes to the phase of the dotting pattern and thereafter samples the video signal. The video signals are also preceded by at least one predetermined digital word which identifies the particular remote transmitter and prepares the receiver to begin receiving the video samples. DC restoration circuitry determines the average value of the incoming video signals and to add an appropriate DC offset to the video signals to correct for any change in the gray scale of the video samples. A Barker word detector accurately points to the first video sample of the transmitted signal.
REFERENCES:
patent: 3350504 (1967-10-01), Takayanagi
patent: 3766316 (1973-10-01), Hoffman
patent: 3855576 (1974-12-01), Braun
patent: 4057836 (1977-11-01), Munsey
patent: 4081830 (1978-03-01), Mick
patent: 4255810 (1981-03-01), Solomon
Colorado Video Inc. (CVI) Publications: "The TV Camera as a Computer Input", Video Digitizer 270A, Video Expander 275, Bibliography of Articles and Reports, Application Brochure for CVI narrow band video systems.
Robot Research Co., Inc., "Model 400 Slow Scan Television Scan Converter".
Britton Howard
Gillman James W.
Motorola Inc.
Pristelski James S.
Roney Edward M.
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