Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1991-01-25
1992-07-28
Chin, Stephen
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551841, 4551921, 34082572, H04B 116
Patent
active
051347202
ABSTRACT:
A signal locating apparatus for locating within a frequency band an input signal of a first frequency, the signal locating apparatus including a signal receiver for receiving the input signal. The signal receiver is characterized by having a relatively narrow bandwidth response of variable center frequency, the signal receiver being capable of generating a detected signal when the center frequency is substantially equal to the first frequency, the signal locating apparatus further including search device for varying the center frequency at a relatively high rate so as to cause the signal receiver to search for the presence of the input signal within a frequency band, the search device being operable in response to generation of the detected signal to stop the search for the presence of the input signal. The signal receiver includes an oscillator of variable frequency which determines the center frequency, a mixer receiving the input signal and operative to generate an intermediate frequency signal and a demodulator connected to receive the intermediate frequency signal and operative to generate the detected signal upon receipt of the intermediate frequency signal. The search device includes an integrator connected so as to receive the output signal of the demodulator so that the occurrence of the detected signal at the demodulator output causes an abrupt change in the integrator output.
REFERENCES:
patent: 3893113 (1975-07-01), Iten et al.
patent: 4498191 (1985-02-01), Rogers
patent: 4592094 (1986-05-01), Ufkes
patent: 4780909 (1988-10-01), Sakashita et al.
Gamgee Christopher J.
Nickols Alan H. F.
Amskan Limited
Chin Stephen
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