Digital homodyne processing system

Details Digital homodyne processing system Digital homodyne processing system

1979-10-31

1981-07-21

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

367135, 343 5NQ, G01S 1502

Patent

active

042802024

ABSTRACT:
A digital homodyne processing system is disclosed and includes a hydrophone, a preamplifier for amplifying the hydrophone output signal, a heterodyne circuit and a low-pass filter for filtering the amplified hydrophone output, and a digital-to-analog converter. The output of the digital-to-analog converter is compared against sine and cosine references and is integrated as a function of the sine and cosine references. The integration results are processed for detection of a coded waveform.

REFERENCES:
patent: 3747099 (1973-07-01), Wong

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