Asynchronous sample rate converter
AssigneeActiwave AB
InventorsErik Lindahl, Pär Gunnars Risberg
Life of this patent
Estimating the term…
Abstract
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.
Claims21
A sample rate converter for converting an input signal sampled at a first sample rate to an output signal sampled at an output sample rate different from the first sample rate, the sample rate converter comprising:
- a frequency synthesizer configured to produce a clock signal;
- a cross enable unit configured to accept the clock signal and the input signal and to generate a count disparity signal and a de-jittered signal sampled at substantially a mean of the first sample rate from the input signal and the clock signal;
- and
- a linear interpolation unit configured to generate the output signal at a sample rate of the clock signal from the de-jittered signal, the clock signal, and the count disparity signal.
A method for converting an input signal sampled at a first sample rate to an output signal sampled at an output sample rate different from the first sample rate, the method comprising:
- producing a clock signal;
- accepting the clock signal and the input signal;
- generating a count-disparity signal and a de-jittered signal sampled at substantially a mean of the first sample rate from the input signal and the clock signal;
- generating the output signal at a sample rate of the clock signal from the de-jittered signal, the clock signal, and the count disparity signal.
Dependencies are inferred from the claim text.