Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1996-10-21
1999-03-30
Le, Thanh Cong
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
455223, 455298, H04B 118
Patent
active
058900594
ABSTRACT:
A method and apparatus for suppressing noise in a radio receiver or the like due to electromagnetic interference generated by the firing of a spark plug which coordinates the operation of a noise blanker with the EST signal generated by an electronic engine control module or similar spark timing signal. The apparatus of the present invention comprises a noise blanker disposed within a radio receiver for blanking the output of the radio receiver for a predetermined duration after a predetermined time delay has elapsed after each EST signal pulse. The noise blanker is activated for a time duration slightly longer than the duration of the impulse noise. The noise blanker may also be designed to be deactivated when the desired signal level reaches a predetermined level. The apparatus of the present invention may be used in conjunction with other noise suppression systems to eliminate noise due to sources other than the electronic ignition system.
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Easterwood Michael John
Shoemaker Michael Allen
Stricker Jeffrey M.
Cong Le Thanh
Delco Electronics Corporation
Funke Jimmy L.
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