Digital demodulator

Details Digital demodulator Digital demodulator

1988-10-13

1990-12-25

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

329323, 375 53, 341 50, H03M 160

Patent

active

049806874

ABSTRACT:
An analog baseband signal modulates a reference-frequency carrier signal to provide a double-sideband, suppressed-carrier DSB-SC signal. The DSB-SC signal is converted in a voltage-to-frequency converter to a series of pulses, which are demodulated to produce a digitally formatted version of the baseband signal. A notch filter for rejecting an undesired analog signal includes a voltage-to-frequency converter and a selective feedback path which demodulates the undesired signal from a frequency-encoded domain back to the analog domain for a cancellation in a summer preceding the voltage-to-frequency converter.

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patent: 4777449 (1988-10-01), O'Connor

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