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Class Information
Number: 375/142
Name: Pulse or digital communications > Spread spectrum > Direct sequence > End-to-end transmission system > Having correlation-type receiver
Description: Subject matter in which transmitted signals are recovered using a structure or method that compares a transmitted spreading code sequence with a local spreading code sequence, generally by multiplicative means.

Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Patent Number Title Of Patent Date Issued
4313197 Spread spectrum arrangement for (de)multiplexing speech signals and nonspeech signals Jan. 26, 1982
4225935 Coding method and system with enhanced security Sep. 30, 1980
4179658 Secret-signalling system utilizing noise communication Dec. 18, 1979
4170757 Method of and apparatus for transmitting clandestine radio signals Oct. 9, 1979
4156877 In null steering apparatus a reference to spread spectrum signals May. 29, 1979
4052565 Walsh function signal scrambler Oct. 4, 1977

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