Radio receiver having ignition noise detector and method therefor
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United States of America Patent
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Mar 9, 2010
Issued Date -
N/A
app pub date -
May 10, 2007
filing date -
May 10, 2007
priority date (Note) -
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Abstract
An AM receiver including an AM demodulator for demodulating an AM signal received by an antenna coupled to the AM demodulator is provided. The AM receiver further includes a bandpass filter for receiving the demodulated signal and generating a bandpass filtered signal. The AM receiver further includes a moving average filter for receiving the bandpass filtered signal and generating a moving averaged signal and a highpass filter for receiving the moving averaged signal and generating a highpass filtered signal. The AM receiver further includes an averaging filter for receiving the highpass filtered signal and generating an averaged signal and a summer for receiving the averaged signal and the highpass filtered signal and generating a difference signal. The AM receiver further includes a comparator for generating a noise blanking signal based on a comparison of the difference signal with a threshold.
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