Sample Rate Converter and Rate Estimator Thereof and Rate Estimation Method Thereof
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United States of America Patent
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Issued Date -
May 28, 2015
app pub date -
Sep 26, 2014
filing date -
Nov 26, 2013
priority date (Note) -
Abandoned
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Abstract
A sample rate converter receives an input signal with an input sample rate, and generates an output signal with an output sample rate. The sample rate converter includes: a rate estimator, a polynomial interpolation calculation circuit, an up sampling filter, and a down sampling filter. The rate estimator includes: a subtractor, which generates an error signal according to an input clock signal and a second order rate signal; a first order integrator, which generates a first order rate signal according to the error signal; and a second order integrator, which generates the second order rate signal according to the first order rate signal.
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