Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1983-02-28
1984-10-09
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455191, 455197, 455340, H04B 126
Patent
active
044765835
ABSTRACT:
A tuning system for a receiver for providing an IF signal from a selected one of RF signals residing in a signal frequency band, comprises filter means for passing RF signals corresponding to a selected channel in response to a filter tuning control signal, mixing means responsive to the selected RF signals and a local oscillator signal for frequency translating the selected RF signals to develop a predetermined IF signal and a local oscillator for generating the local oscillator signal in response to an oscillator tuning control signal. A DC signal translating means includes an amplifier having an input responsive to the oscillator tuning control signal and having first and second predetermined gain transfer characteristics for modifying the oscillator tuning control signal and for providing at an output the filter tuning control signal. A switch means responsive to one of the tuning control signals changes the gain characteristic of the amplifier from the first characteristic to the second, so as to derive a piecewise-linear approximation of the filter tuning control signal from the oscillator tuning control signal.
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German Language Article, "Digitaler Suchlauf fur einen UKW-Empfanger" (Digital Station Finding for a VHF Receiver), by Henno Schotten appearing in FUNKSHAU, vol. 43, Sep. 1, 1971, pp. 535-537, and a translation of it.
Edelman Lawrence C.
Emanuel Peter M.
Ng Jin F.
RCA Corporation
Whitacre Eugene M.
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