Abstract: The concept of integer ratio sample rate conversion is extended to fractional values, where the exact ratio is expressed as ?M+N/D!/L with L being a constant. This methodology allows sample rate conversion for all synchronous rates, where all rates are derived from the same crystal oscillator. For the implementation, the value of N/D is accumulated and depending on the overflow condition, either M or M+1 is selected as sample rate ratio for the conversion of each sample.

Abstract: A system for decimating a source signal with a source sample rate by a non-integer factor to a sink signal with a sink sample rate is disclosed. The system first determines a decimation factor based on a ratio of the source sample rate to the sink sample rate. The system then decimates the source signal by the decimation factor to an intermediate ("IM") signal with an IM sample rate which is larger than the sink sample rate. The IM signal is then applied to a sample-rate converter to down convert to the sink signal with the sink sample rate, using a decimation factor between only 1 and 2.