Telecommunications – Receiver or analog modulated signal frequency converter – Frequency or phase modulation
Patent
1984-07-02
1986-07-15
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency or phase modulation
455214, 455263, 329122, 333172, 331 32, H04B 126
Patent
active
046010610
ABSTRACT:
An AFC circuit may include an oscillator having an output frequency responsive to a derived error signal, a mixer for mixing a received signal with the output of the oscillator to produce an intermediate frequency, and a signal recovery detector for recovering the information carried by the intermediate frequency. An integral loop filter and compensation circuit receives the recovered signal from the detector, provides a compensated recovery signal which is independent of the closed loop frequency response of the AFC circuit, and provides an error signal which controls the oscillator.
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Mischa Schwartz, William R. Bennett, & Seymour Stein, "Communication Systems and Techniques", Inter-University Electronics Series, vol. 4, (1966) 154-160.
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Scott Carney and Don Linder, "A Digital Mobile Radio for 5-6 Kilohertz Channels", IEEE International Conference on Communications, vol. 3, (1982).
Carney Scott N.
Linder Donald L.
Motorola Inc.
Ng Jin F.
Roney Edward M.
Southard Donald B.
Warren Charles L.
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