Telecommunications – Receiver or analog modulated signal frequency converter – Convertible to different type
Patent
1997-01-29
1999-06-15
Pham, Chi H.
Telecommunications
Receiver or analog modulated signal frequency converter
Convertible to different type
455132, 455140, 4551821, 455136, 375347, 375344, 375316, H04B 1702
Patent
active
059131551
ABSTRACT:
A broadcasting signal receiving apparatus includes a first signal receiving portion for receiving selectively frequency-modulated broadcasting signals to obtain a frequency-modulated intermediate frequency signal, a first band pass filter through which the frequency-modulated intermediate frequency signal passes, a first demodulator for frequency-demodulating the frequency-modulated intermediate frequency signal to obtain a first demodulation output signal, a second signal receiving portion for receiving selectively amplitude-modulated broadcasting signals to obtain an amplitude-modulated intermediate frequency signal, a second band pass filter through which the amplitude-modulated intermediate frequency signal passes, a second demodulator for amplitude-demodulating the amplitude-modulated intermediate frequency signal to obtain a second demodulation output signal, an output portion for obtaining a reproduced information output based on one of the first and second demodulation output signals, a signal supplying portion for supplying the first demodulator with the amplitude-modulated intermediate frequency signal when the reproduced information output based on the second demodulation output signal can be obtained from the output portions, and an operation controller for using a demodulation output signal obtained from the first demodulator under a condition in which the amplitude-modulated intermediate frequency signal is supplied to the first demodulator by the signal supplying portions for controlling selective reception of the amplitude-modulated broadcasting signals in the second signal receiving portion.
REFERENCES:
patent: 3800226 (1974-03-01), Close
patent: 4222121 (1980-09-01), Matsumoto et al.
patent: 4388496 (1983-06-01), Miyamoto
patent: 5020147 (1991-05-01), Okanobu
patent: 5034695 (1991-07-01), Owen
Bayard Emmanuel
Maioli Jay H.
Pham Chi H.
Sony Corportaion
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