Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1993-08-17
1995-09-12
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551642, 4551822, 4551823, 4551841, 4551851, 4551923, 4551961, H04B 116
Patent
active
054506212
ABSTRACT:
Manually tunable analog receivers with AFC have the drawback that the AFC exhibits hysteresis and that in the event of fading pulling to an adjacent station may occur, whereas receivers with PLL electronic tuning have the drawbacks that tuning is comparatively slow and also inaccurate because of the tuning in discrete steps by a microprocessor. The present receiver combines the advantages of both analog manual tuning and electronic tuning. It includes two cooperating frequency loops, one loop (L1) being an AFC loop and the other loop (L2) having a frequency counter (13) for measuring the frequency (f.sub.0) of a tuning oscillator (6) which is controlled by both loops. Cooperation between the loops is provided by a control circuit (16) responsive to control signals supplied by both loops: an in-lock signal (in-1) and an in-window signal (in-w). Preferably, when the desired tuning is achieved, the power to a tuning section (12) of the receiver, forming part of the frequency loop (L2), is interrupted.
REFERENCES:
patent: 4184121 (1980-01-01), Tanaka
patent: 4344187 (1982-08-01), Ogita et al.
patent: 4374437 (1983-02-01), Citta et al.
patent: 4476580 (1984-10-01), Tanaka et al.
patent: 4955075 (1990-09-01), Anderson
"AM/FM Radio Receiver Circuit", TEA5592, Philips Data Handbook Radio, audio and associated systems Bipolar, MOS, Book IC01, 1991, pp. 1047-1060.
Egelmeers Engelbertus C. J.
Kianush Kaveh
Meeuwis Johannes C. M.
Vereijken Hubertus H. M.
Eason Leroy
Pham Chi H.
U.S. Philips Corporation
Urban Edward F.
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