Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1982-07-19
1985-06-25
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
455219, 455298, 455312, H04B 110
Patent
active
045258708
ABSTRACT:
An automotive radio receiver with a radio frequency interference elimination includes a noise detector adapted to detect noise in the power source wiring and a circuit for eliminating radio frequency interference noise. The detector is physically connected to the power source wiring so that it can satisfactorily detect noise in the power source wiring such as spark ignition noise and switching noise of the automotive electric equipments. The noise elimination circuit includes a switch normally closed and responsive to the noise signal produced by the noise detector to open, and a capacitor for holding the radio signal level while the switch is opened and discharging the constant-level signal for reproduction of the radio sound.
REFERENCES:
patent: 3995219 (1976-11-01), Rasehorn et al.
patent: 4000414 (1976-12-01), Hansen
patent: 4066845 (1978-01-01), Kishi
patent: 4178552 (1979-12-01), Amazawa et al.
patent: 4198541 (1980-04-01), Fukushima
patent: 4326297 (1982-04-01), Sato et al.
"Grundig Tech. Inf." (Germany), vol. 24, No. 1 (1977) by Spiegel.
Fujiki Norio
Fukuhara Hiroshige
Ng Jin F.
Nissan Motor Company Limited
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