Arbitrary sample rate conversion using modulus accumulator

A sample rate converter (SRC) for implementing a rate conversion R, wherein the SRC receives input samples at an input rate Fin and outputs samples at an output rate Fout=Fin/R, and wherein R is a fractional value greater than 1, the SRC comprising:

• a multiplier block to multiply each of the received input samples by a respective one of delta values, wherein each of the delta values is associated with a time interval from a sample time of one of the SRC output samples;
• integration and dump circuitry to sum outputs of the multiplier block;
• and
• resampler control circuitry to generate N delta values of the delta values and N buffer write pointers in parallel, wherein N is an integer greater than 1;
• a plurality of filters;
• and
• a plurality of buffers to buffer samples between the integration and dump circuitry and the plurality of filters based at least in part on the N buffer write pointers.

A method for performing a sample rate conversion R with an input rate Fin and output rate Fout=Fin× R, wherein R is a fraction greater than 1, the method comprising:

• receiving input samples at the input rate Fin;
• processing the received input samples by a plurality of filters;
• storing outputs samples of a first filter of the plurality of filters in a first-out (FIFO) buffer;
• reading the stored samples from the FIFO buffer according to N FIFO read pointers;
• generating rate-converted output samples at the output rate Fout based on the read samples and respective delta values, wherein each of the delta values corresponds to a time interval from one of the received input samples;
• and
• generating, in parallel, N delta values of the delta values and the N FIFO read pointers based on R, wherein N is an integer greater than 1.