Multi-stream audio sampling rate conversion system and method using variable converter rate control data

A sample rate conversion system for converting data sampled at different rates comprising:

• first means for receiving a plurality of digital input audio data streams wherein each input audio data stream contains audio data sampled at a different rate;
• residue memory means, operatively coupled to the first means for receiving, for receiving and simultaneously storing previous audio data samples separately for each of the plurality of input audio data stream;
• second means for receiving the plurality of input audio data stream and for communicating the input audio data stream to the first means for receiving;
• means for generating variable converter rate control data to facilitate a programmable conversion of the input audio data stream based on the variable converter rate control data and for generating command data to facilitate mixing of data streams after conversion;
• means, operatively coupled to the first means for receiving, the residue memory and responsive to the variable converter rate control data, for alternately converting each of the plurality of input audio data stream to output data representing at least one input data stream as if it were sampled at a different rate, based on the stored previous samples for each input data stream and the variable converter rate control data, and further including coefficient memory means for storing sets of filter coefficients corresponding to each of a plurality of predetermined decimation filters to facilitate conversion of the multiple input data streams.

A sample rate conversion method for converting audio data sampled at different rates comprising:

• receiving a plurality of input audio data streams using a first receiving means, wherein each input audio data stream contains audio data sampled at a different rate;
• communicating the input audio data streams to the first means for receiving the plurality of input audio data streams;
• receiving and simultaneously storing previous audio data samples separately for each of the plurality of input audio data streams in residue memory;
• generating variable converter rate control data to facilitate a programmable conversion of the input audio data streams based on the variable converter rate control data;
• and
• alternately converting each of the plurality of input audio data streams to output data representing at least one input audio data stream as if it were sampled at a different rate, based on the stored previous samples for each input audio data stream and the variable converter rate control data.