Direct conversion radio receiver for FM signals

Details Direct conversion radio receiver for FM signals Direct conversion radio receiver for FM signals

1982-09-08

1985-06-04

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 45, 375122, 329110, 329124, 370 11, H03D 300

Patent

active

045218927

ABSTRACT:
A radio receiver for FM signals having a demodulation system to produce an approximation to an analog output by either measuring the time intervals between successive zero crossings in the I.F. (FIG. 1, FIG. 2B) or by filtering pulses produced at each zero crossing of the I.F. (FIG. 1, FIG. 2A). The demodulator includes two signal pathways in quadrature phase relation, the second signal either lagging or leading the first signal in dependence on whether the received signal frequency is above or below a local oscillator frequency. The modulation frequency can carry analog information separate and apart from the on-off (digital) information.

REFERENCES:
patent: 3729587 (1973-04-01), McGill, Jr. et al.
patent: 3925614 (1975-12-01), Bousmar
patent: 4021743 (1977-05-01), Claxton
patent: 4193034 (1980-03-01), Vance
patent: 4254503 (1981-03-01), Vance
patent: 4291274 (1981-09-01), Suzuki et al.
patent: 4308500 (1981-12-01), Avins
patent: 4316150 (1982-02-01), Crosby
patent: 4322851 (1982-03-01), Vance
patent: 4378509 (1983-03-01), Hatchett et al.
Mims; Forrest M., III, Engineer's Notebook II, Radio Shack, 1982, p. 22.

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