Demodulators – Frequency shift keying or minimum shift keying demodulator – Input signal combined with local oscillator or carrier...
Patent
1994-08-15
1995-09-26
Mis, David
Demodulators
Frequency shift keying or minimum shift keying demodulator
Input signal combined with local oscillator or carrier...
375324, 375334, H03D 300, H04L 2714
Patent
active
054537150
ABSTRACT:
A communication device (100) includes mixers (104) and (108) which mix a local oscillator (112, 106) with a received signal to produce in-phase (i) and quadrature (q) components. The direction of the phase of the signal is detected at the i and q zero crossings. Next, the speed with which the phase rotation angle travels from one zero crossing to another is monitored via a controller (126). The controller (126) manipulates the speed and the direction of the phase rotation angle in order to establish the contents of the received information signal.
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IEEE Transactions on Communication Technology, vol. Com-18, No. 2, Apr. 1970, pp. 110-118 "An FM Detector For Low S/N" by John H. Park, Jr.
Ghomeshi M. Mansour
Mis David
Motorola Inc.
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