Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1993-03-19
1995-06-27
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
455 76, 455260, 455316, 455318, 331 25, 331 36C, 331 66, 348735, H04B 128, H03L 7083, H04N 550
Patent
active
054288355
ABSTRACT:
A superheterodyne receiver has a receiver circuit formed into a single semiconductor chip comprising a pseudo band-pass filter employing components equivalent to those of an intermediate-frequency filter of the receiver circuit and an oscillation circuit employing the pseudo band-pass filter as a feedback path thereof.
The oscillation circuit oscillates at a frequency equal in value to the center frequency of the intermediate-frequency filter. The semiconductor chip is further equipped with a PLL circuit allowing the frequency-division ratio of a variable frequency-divider circuit to be varied in order to control a reception frequency, and the oscillation frequency of the oscillation circuit is monitored. Data representing the reception frequency is derived from the monitored oscillation frequency and the value of the frequency-division ratio of the variable frequency-divider circuit, and then output to a display element to display the reception frequency.
REFERENCES:
patent: 4479259 (1984-10-01), Fenk
patent: 5115515 (1992-05-01), Yamamoto et al.
Maioli Jay H.
Sony Corporation
Urban Edward F.
Wisler Mark D.
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