1. An asynchronous sample rate conversion method, comprising: receiving an input signal, in the form of a sample stream at an input sample rate; determining a relationship between the input sample rate and an output sample rate; responsive to the determining step determining that the input sample rate is lower than the output sample rate, converting the sample rate of the input signal to the output sample rate according to a first sample rate conversion algorithm; and responsive to the determining step determining that the input sample rate is higher than the output sample rate, converting the sample rate of the input signal to the output sample rate according to a first sample rate conversion algorithm.