Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1991-07-16
1992-06-23
Kuntz, Curtis
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551921, 455343, 3581911, H04B 116
Patent
active
051251060
ABSTRACT:
A switch control apparatus for a tuning system includes a station selecting unit which has an analog to digital converter to which a first signal indicative of the reception state of a receiver and a second information signal independent of the first signal are inputted. A switching circuit selects one of the two input signals to the analog to digital converter in accordance with the on or off state of a power supply of the receiver. A control circuit controls the switching circuit such that when the power supply is on, the first signal indicative of the reception state is inputted to the analog to digital converter while when the power source is off, the second information signal is input to the analog to converter.
REFERENCES:
patent: 3949158 (1976-04-01), Rzeszewski et al.
patent: 4375651 (1983-03-01), Temolin et al.
patent: 4601060 (1986-07-01), Wine
patent: 4763195 (1988-08-01), Tults
patent: 4814887 (1989-03-01), Marz et al.
Kuntz Curtis
Matsushita Electric - Industrial Co., Ltd.
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