Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1980-03-03
1981-11-10
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
370109, H04N 708, H04J 300
Patent
active
043001610
ABSTRACT:
Frequency and time division multiplexing arrangements are common for efficiently utilizing bandwidth in a communication system. Still another, lesser known arrangement is called time compression multiplexing. In time compression multiplexing, a signal from each input channel is stored for a short period of time. The signals from all channels are then read from the store, compressed in time and transmitted over a communication path to a receiver. Unfortunately, the art appears to be remiss in the time compression multiplexing of video signals. The subject signal processor includes a plurality of input terminals (111, . . . , 11N), each input terminal being adapted to receive a video signal, each video signal including a plurality of scan lines, each scan line having a time duration T seconds. The signal processor also includes an arrangement for compressing a video signal by a factor M (illustratively M=N). More specifically, the signal processor compressing arrangement includes apparatus (120, 131, . . . , 13N) for modulating each input video signal with a chirp signal. A first, predetermined delay (142, . . . , 14N) is introduced to the modulated signals, which may be added (150 ). The compressing arrangement also includes apparatus (160) for introducing a second, variable delay to the modulated video signals, e.g., with a dispersive filter (160). The resultant time compressed signal is extracted from the dispersive filter output by an envelope detector (170) and extended over a communication path (300) to a receiver (200) where the time compressed signal is expanded through a receiver modulator (230), distributing apparatus (240), dispersive filter (261, . . . , 26N) and envelope detector (271, . . . , 27N) for extension to a plurality of output terminals (281, . . . , 28N).
REFERENCES:
patent: 3697682 (1972-10-01), Berg
Klauder et al., "The Theory and Design of Chirp Radars", The Bell System Technical Journal, vol. 39, No. 4, Jul. 1960, pp. 745-808.
Flood et al., "Time-Compression-Multiplex Transmission," Proc. of IEEE, vol. 111, No. 4, Apr. 1964, pp. 647-668.
Gerard et al., "The Design & Application of Highly Dispersive Acoustic Surface-Wave Filters", IEEE Trans. on Microwave Theory and Tech. vol. MTT-21, No. 4, Apr. 1973, pp. 176-186.
Bristol, "Modern Radar Pulse Compression Techniques", NEREM (Northeast Electronics Research & Eng. Mtg.) 1974 Record, vol. 16, Oct. 1974, pp. 65-72.
Bell Telephone Laboratories Incorporated
Martin John C.
Roddy Richard J.
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