1975-07-02
1976-10-12
Stewart, David L.
179 84VF, H04J 312
Patent
active
039859657
ABSTRACT:
Digital signal generator for producing digital signalling codes employed in a digital telephone communication system including several tone generators for providing presynthesized digital tone signals which are convertible to audible tones. Permutable digital codewords are produced by a codeword generator. Some of the tone signals and codewords are combined by FSK and switching circuitry. Tone signals, codeword signals, and combination signals are stored in storage registers and read out by a multiplexer to provide a continuous TDM bit stream of 60 channels of digital signalling codes.
REFERENCES:
patent: 3435149 (1969-03-01), Inose
patent: 3801746 (1974-04-01), Buchner
patent: 3870826 (1975-03-01), Carbrey
patent: 3899642 (1975-08-01), Jones
patent: 3906164 (1975-09-01), Philip
Field Robert G.
Mason Marvin S.
GTE Sylvania Incorporated
Keay David M.
Nealon Elmer J.
O'Malley Norman J.
Stewart David L.
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