Asynchronous sample rate converter

摘要

An asynchronous sample rate converter and method for converting an input signal to a resampled output signal is disclosed. An efficient and cost-effective sample rate converter for converting an input signal of arbitrary sample rate to a resampled output signal of a second sample rate is disclosed. A hardware-efficient sample-rate converter for resampling an audio input signal with an arbitrary sample rate to an output audio signal with a known sample rate for use in an audio processor is disclosed.

主权项

1. A sample rate converter for converting an input signal sampled at an input sample rate to an output signal sampled at an output sample rate different from the input sample rate, the sample rate converter comprising:
a clock source for generating and/or accepting a clock signal; a counter configured to generate a count-disparity signal from the clock signal and the input signal; a first sigma delta loop configured to calculate a temporal correction value from the count-disparity signal; a resampled clock generator configured to generate one or more resampled clock signals from the temporal correction value; and a second sigma delta loop configured to generate the output signal from one or more of the resampled clock signals and the input signal, wherein the second sigma delta loop generates an incremental output signal on every cycle of a resampled output signal, and wherein the incremental output signal is added to the output signal to generate the output signal at the output sample rate.