Six channel digital demodulator

Details Six channel digital demodulator Six channel digital demodulator

1990-07-26

1992-03-24

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 329310, 375 80, 375 82, 375 94, H04L 2730

Patent

active

050994948

ABSTRACT:
A six channel programmable digital demodulator of the type designed to be manufactured as an integrated circuit with other components comprises a code channel, a level channel and a phase channel each of which includes two accumulate and scale circuits. Each of the accumulate and scale circuits is connected to an I or a Q channel of the data which has been despread after being received from the communications receiver. The outputs of two of the accumulate and scale circuits are applied to a two to one multiplexor which is controlled by a command generator to provide a selectable output defining a clock error signal. The remaining four accumulate and scale circuits are connected to a first four to one multiplexor to provide a selectable output defining a clock error signal. The same four remaining outputs from said accumulate and scale circuits are connected to a second four to one multiplexor having an output defining a carrier error signal.

REFERENCES:
patent: 3992617 (1976-11-01), Epstein
patent: 4910469 (1990-03-01), Takahashi
patent: 4933952 (1990-06-01), Albrieux et al.

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