Techniques for sample rate conversion

Details Techniques for sample rate conversion Techniques for sample rate conversion

2006-06-13

2006-06-13

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

C341S050000

Reexamination Certificate

active

07061409

ABSTRACT:
Techniques for sample rate conversion are disclosed. In one exemplary embodiment, a sample rate conversion occurs between first samples having a sample rate defined by a first clock signal and second samples having a sample rate defined by a second clock signal. Using a conversion ratio and at a first rate defined by the first clock signal, a given second sample is determined from at least one first sample. A write pointer is updated for a buffer when second samples are written into the buffer. A read pointer is updated for the buffer when second samples are read from the buffer. The second samples are read from the buffer at a second rate defined by the second clock signal. The conversion ratio is modified based on the write and read pointers.

REFERENCES:
patent: 6744837 (2004-06-01), Satou et al.
patent: 2005/0163276 (2005-07-01), Sudo et al.
“Digital Methods for Conversion Between Arbitrary Sampling Frequencies”, Tor A. Ramstad, IEEE Transactions on Acoustics, Speech, And Signal Processing, vol. ASSP-32, No. 3, Jun. 1984, pp. 577-591.
“An Efficient Approach For Conversion Between Arbitrary Sampling Frequencies”, Tapio Saramäki et al., IEEE 1996, pp. 285-288, no month.

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