Radio receiver having frequency sweep control apparatus

Details Radio receiver having frequency sweep control apparatus Radio receiver having frequency sweep control apparatus

1992-12-29

1994-08-02

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455257, H04B 116

Patent

active

053353480

ABSTRACT:
A frequency sweep control apparatus includes a variable frequency oscillator, a demodulator, a unique word signal detector, a sweep range controller, and a frequency controller. The variable frequency oscillator is capable of controlling an oscillation frequency. The demodulator demodulates a reception intermediate frequency signal by using an output from the variable frequency oscillator. The unique word signal detector detects a unique word signal in the reception signal from a demodulated output from the demodulator 102 and outputs a detection signal indicating a unique word signal detected state in which the unique word signal is detected or a unique word signal non-detected state in which the unique word signal is not detected. The sweep range controller controls a sweep range on the basis of an output from the unique word signal detector. The frequency controller controls the oscillation frequency of the variable frequency oscillator on the basis of an output from the sweep range controller.

REFERENCES:
patent: 2896169 (1959-07-01), Howell
patent: 4004233 (1977-01-01), Sakamoto
patent: 4152650 (1979-05-01), Bennett, Jr.
patent: 4636736 (1987-01-01), Woodworth et al.
patent: 5107522 (1992-04-01), Kitayama et al.

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