Sample rate conversion combined with DSM

Details Sample rate conversion combined with DSM Sample rate conversion combined with DSM

2006-03-20

2008-03-11

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S144000

Reexamination Certificate

active

07342525

ABSTRACT:
Digital to Analog Conversion and sample conversion blocks are combined in order to reduce hardware and/or computational complexity. A novel DSM design is used to perform sample rate conversion. The DSM may also be used to perform other digital filtering functions, thus providing a single hardware/software technique to perform both functions. The invention includes a method and apparatus for converting input data samples provided at a first sample rate to an analog output signal. Input data samples are converted by a Delta Sigma Modulator (DSM) in a Digital to Analog Converter (DAC) to output data samples, where internal states of the DSM are updated at a second sample rate unequal to the first sample rate. At least one internal state of the DSM s modified to account for the time difference in response to a new input sample arriving at a time different from an update of the internal states of the DSM.

REFERENCES:
patent: 5500874 (1996-03-01), Terrell
patent: 5815102 (1998-09-01), Melanson
patent: 6150969 (2000-11-01), Melanson
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patent: 6480129 (2002-11-01), Melanson
“Design of IIR Filters” (Samir V. Ginde & Joseph A.N. Noronha), Virginia Polytechnic and State University, (www.ee.vt.edu/˜jnoronha/dsp—proj2—report.pdf), undated.
“Infinite Impulse Response” (http://en.wikipedia.org/wiki/Infinite—impulse—response) from Wikipedia, the free encyclopedia, undated.

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