Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1995-03-02
1997-05-13
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551801, 4551961, 455208, 455258, H04B 118
Patent
active
056302142
ABSTRACT:
A wide-band receiving apparatus used in an FM-FDM type optical image distributing system for transmitting multi-wave and multiple TV signals comprises a circuit for receiving a wide-band input signal containing modified RF signals of two or more different frequency bands and separating the RF signals by the bands; respectively, a first circuit for selecting one of the separated RF signals; a local oscillating circuit for generating a first oscillating signal of a fundamental frequency which is determined based on the frequency range of the selected RF signal; a circuit for producing at least one oscillating signal of a frequency having a predetermined ratio to the fundamental frequency; a second selecting circuit for selecting one of the first oscillating signal and at least one second oscillating signal; a circuit for mixing the selected RF signal with the selected oscillating signal thereby producing an intermediate-frequency signal; and a circuit for demodulating the intermediate-frequency signal.
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Nagashima Toshio
Noda Masaki
Oga Masatoshi
Yamamoto Akio
Hitachi , Ltd.
Urban Edward F.
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