Radio receiver and method for suppressing attenuation properties

Details Radio receiver and method for suppressing attenuation properties Radio receiver and method for suppressing attenuation properties

1998-01-15

2000-08-29

To, Doris H.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455 75, 455207, 455314, 455316, 455317, H04B 110

Patent

active

061120693

ABSTRACT:
A radio receiver, and a method therefore, for efficiently suppressing attenuation properties of a low frequency signal, in an analog frequency modulation type radio communication system. The radio receiver includes a first down-converter for mixing a modulated, high-frequency signal received by the radio receiver and a predetermined local oscillating signal to generate an intermediate frequency signal. A modulator modulates the predetermined local oscillating signal by an aural signal transmitted from the transmitter and generates a mixing signal for down-mixing the electrical signal representative of modulated, high-frequency signal. The mixed signal is then applied to the first down-converter. A second down-converter down-converts, in frequency, the intermediate frequency signal generated from the first down-converter into a baseband signal to generate the down-converted signal. A demodulator demodulates the down-converted baseband signal to a demodulated signal representative of the modulated, high-frequency signal received by the radio receiver.

REFERENCES:
patent: 4718113 (1988-01-01), Rother et al.
patent: 4736390 (1988-04-01), Ward et al.
patent: 5111162 (1992-05-01), Hietala et al.
patent: 5428836 (1995-06-01), Sanecki et al.
patent: 5584066 (1996-12-01), Okanobu
patent: 5649296 (1997-07-01), MacLellan et al.

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