Digital-to-analog converting system with sampling rate conversions and sampling rate converting method thereof
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United States of America Patent
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Jul 27, 2010
Grant Date -
Mar 25, 2010
app pub date -
Feb 4, 2009
filing date -
Sep 19, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A digital-to-analog converting system with sampling rate conversions includes an interpolator, S orders of operating and filtering units, an up-converting and down-converting circuit, and a signal processing circuit. The interpolator performs an N-times interpolation on a first digital input signal to generate a second digital input signal. Each order of the operating and filtering unit includes a K-times zero-padding circuit and a filtering circuit. The filtering circuit performs a filtering operation to generate a filtered digital input signal. The up-converting and down-converting circuit performs a B-times up-conversion and an A-times down-conversion on the filtered digital input signal to generate a fourth digital input signal. The signal processing circuit generates an analog output signal according to the fourth digital input signal.
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