Direct conversion radio receiver for FM signals
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United States of America Patent
Stats
-
Jun 4, 1985
Grant Date -
N/A
app pub date -
Sep 8, 1982
filing date -
Sep 24, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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