Modem for pseudo noise communication on a.c. lines

Details Modem for pseudo noise communication on a.c. lines Modem for pseudo noise communication on a.c. lines

H - Electricity

04

B

340/79

H04B 3/54 (2006.01) H04B 1/707 (2006.01)

Patent

CA 1226914

ABSTRACT A modem which may operate as a transmitter or receiver, is provided for use on a line carrying an A.C. signal. The modem comprises a pseudorandom code genera- tor which produces a pseudorandom code signal of a fre- quency an integral multiple of the A.C. signal frequency. Synchronization means synchronizes the code signal with the A.C. signal. Preferably a coherent system is pro- vided in which a data signal involved has a bit rate an integral multiple of the A.C. signal frequency and in which a carrier generator is additionally provided to produce a carrier signal of a frequency an integral multiple of the A.C. signal frequency. In such case, the synchronization means also synchronizes the data bit and carrier signals with the A.C. signal.

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