Patent ID: 7801311

Claim:
A stereo decoding system for use in a radio receiver that receives a radio signal, comprising: a first digital filter, operably coupled to a first composite audio channel for producing a first filtered composite audio signal, the first digital filter having a first set of filter coefficients; a second digital filter, operably coupled to a second composite audio channel for producing a second filtered composite audio signal, the second digital filter having a second set of filter coefficients; a sum/difference network, operably coupled to the first filtered composite audio signal and the second filtered composite audio signal for producing a left channel signal and a right channel signal; a processor, operably coupled to the first digital filter and the second digital filter for executing operational instructions that: calculate a first corner frequency of the first digital filter based on a signal quality of the received radio signal; calculate a first set of filter coefficients for the first digital filter based on the first corner frequency and an approximation of a filter transform, and store the first set of filter coefficients in the first digital filter; calculate a second corner frequency of the second digital filter based on the signal quality; and calculate a second set of filter coefficients for the second digital filter, based on the second corner frequency and the approximation of the filter transform, and store the second set of filter coefficients in the second digital filter.