Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1981-03-05
1982-10-05
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
370101, 370102, 370108, 375118, 360 54, H04L 704
Patent
active
043531296
ABSTRACT:
A digital data transmission system comprises a transmitter and a receiver, said transmitter comprising storage means for temporarily storing a data bit string forming a coded digital video signal, means for supplying a read request signal for reading out said data bit string from said storage means, means for forming one frame out of time slots alloted to a frame synchronization bit, a predetermined number of data bit of said data bit string and a dummy flag bit which indicates whether or not a dummy bit exists in said one frame, means for detecting whether or not a fixed bit pattern is formed in said one frame, means for providing said dummy bit to a predetermined one of said time slots in response to the result of said detection, means for inserting a dummy flag bit indicative of whether or not the dummy bit has been inserted to a time slot for said dummy flag bit, means for supplying a data bit which have dropped out by addition of said dummy bit to said frame forming means so that said dropped data bit is inserted as a part of said data bits forming a succeeding frame, and means for suspending the supply of said read request signal for the bit corresponding to said dropped data bit; said receiver comprising an input terminal for receiving in serial fashion the transmitted data bit string supplied from said transmitter, means for detecting said dummy flag bit in said transmitted data bit string, and means for separating said transmitted data bit string into a dummy bit and input data bits in response to the detection of said dummy flag bit.
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patent: 4027100 (1977-05-01), Ishiguro
patent: 4054747 (1977-10-01), Pachynski, Jr.
patent: 4214262 (1980-07-01), Mizukami
patent: 4306304 (1981-12-01), Baxter et al.
"Some Simple Self-Synchronizing Digital Data Scramblers", by J. E. Savage, The Bell System Technical Journal, pp. 449-487, Feb. 1967.
"A Simple Firmware Realization of PCM Freming Systems", by R. Maruta, IEEE Transactions on Communications, vol. COM-28, No. 8, pp. 1228-1233, Aug. 1980.
Nippon Electric Co. Ltd.
Safourek Benedict V.
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