Coded data generation or conversion – Digital code to digital code converters – Data rate conversion
Patent
1997-10-31
1999-10-05
Tokar, Michael
Coded data generation or conversion
Digital code to digital code converters
Data rate conversion
370428, 704504, H03M 700, H04L 1254
Patent
active
059631538
ABSTRACT:
A sample rate conversion system and method uses a digital signal processor (DSP) and a separate sample rate conversion circuit (SRC) to perform multiple stream conversion and mixing of different rate input audio streams. The sample rate conversion system converts data, such as multiple streams of digital audio data sampled at different rates, and performs interpolation, decimation, FIR filtering, and mixing of multiple streams of data using the separate SRC. The SRC uses two bidirectional I/O memories for alternately storing input and output data as part of a sample rate converter. When the sample rate converter writes output to one of the bidirectional memories, it has the option of summing the data with the data already stored in the same I/O memory. Therefore a separate digital signal processor can use the sample rate converter circuit to perform some of the mixing for the multiple streams.
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Chow Hugh
Duan Tieying
Giemborek Vladimir F.
Rosefield Peter L.
ATI Technologies Inc.
Tokar Michael
Wamsley Patrick
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