Digital audio receiver with reduced AM interference

Details Digital audio receiver with reduced AM interference Digital audio receiver with reduced AM interference

2005-04-29

2010-10-05

Dean, Raymond S (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S063100, C455S067130

Reexamination Certificate

active

07809346

ABSTRACT:
A digital audio system including a digital audio amplifier with reduced AM interference. The digital audio amplifier includes a pulse-width-modulation (PWM) processor in which a digital datastream is upsampled by an interpolation filter. A sample rate converter resamples the upsampled datastream to produce a datastream at a converted sampling frequency, or PWM frame rate. The converted datastream is then applied to pulse-width-modulation circuitry which generates a PWM signal at the PWM frame rate. The sample rate converter resamples according to a sample rate conversion ratio associated with the AM tuned frequency. For example, the sample rate conversion ratio can be selected so that the PWM frame rate and its lower harmonics avoid an AM tuned frequency, any intermediate frequency in the AM tuner, and also an image frequency in the tuner.

REFERENCES:
patent: 6456127 (2002-09-01), Tsecouras
patent: 6748028 (2004-06-01), Torre et al.
patent: 2002/0057115 (2002-05-01), Tsecouras
patent: 2003/0058973 (2003-03-01), Tsecouras
patent: 2005/0097154 (2005-05-01), Tsecouras

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