Signal-strength-peak detecting circuit for automatic tuning circ

Details Signal-strength-peak detecting circuit for automatic tuning circ Signal-strength-peak detecting circuit for automatic tuning circ

1991-06-28

1994-01-18

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551923, 4552262, H04B 1700

Patent

active

052806413

ABSTRACT:
In a signal-strength-peak detecting circuit, tuning frequencies by a tuning circuit are periodically varied. Wide band seek is performed according to a signal level of the varied frequencies. When the signal level is greater than a predetermined value, a fine tuning circuit varies tuning frequencies to perform narrow band seek. Further, change of signal levels is detected during narrow band seek to decide whether the peak of the signal level is trapezoidal or rounded. When the peak is decided to be rounded, the maximum value is used as the peak. On the other hand, when the peak is decided to be trapezoidal, the central point of an upper side of the trapezoid is selected as an optimum peak.

REFERENCES:
patent: 2084379 (1937-06-01), Braden
patent: 4264977 (1981-04-01), Deiss
patent: 4334323 (1982-06-01), Moore
patent: 4383333 (1983-05-01), Erickson
patent: 4435841 (1984-03-01), Dobrovolny
patent: 4955073 (1990-09-01), Sugayama

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