Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1993-08-17
1995-07-04
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551823, H04B 116
Patent
active
054308917
ABSTRACT:
A tuning detection circuit for a high-frequency modulated RF signal which is within the frequency band of a receiver. A level signal (1e) is derived which is a measure of a level of the modulated RF signal, and is combined with a signal from a window comparator (20, 21) to which a filtered demodulated signal derived from the modulated RF signal is applied. The detection circuit supplies an in-channel signal (in-1) which indicates whether a desired tuning state has been reached. To prevent that upon detection of stations in a busy frequency band incorrect in-channel signals (in-1) are generated, i.e., signals indicating that the tuning process has been completed even though tuning is actually between two stations instead of to one station, the detection device also combines the level and in-channel signals with output signals of the window comparator, compared by means of a phase comparator (50).
REFERENCES:
patent: 4172995 (1979-10-01), Yoshisato
patent: 4509203 (1985-04-01), Yamada
patent: 4726073 (1988-02-01), Sessink
Egelmeers Engelbertus C. J.
Kianush Kayveh
Meeuwis Johannes C. M.
Eason Leroy
Eisenzopf Reinhard J.
Le Thanh
U.S. Philips Corporation
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