Methods and systems for sample rate conversion

Details Methods and systems for sample rate conversion Methods and systems for sample rate conversion

2003-08-15

2008-08-05

Hudspeth, David R. (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C381S094400, C704S205000

Reexamination Certificate

active

07409339

ABSTRACT:
Methods and systems for sample rate conversion convert a sampled signal to a higher data rate signal. Conversion pulses are received, having a conversion rate that is higher than the sample rate of the sampled signal. Sample points are then reconstructed from the sampled signal, in real time, on either side of a conversion pulse. An interpolation is performed between the reconstructed sample points, at the time of the conversion pulse. The interpolation results are outputted in real time. The process is repeated for additional conversion pulses. The outputted interpolated amplitudes form the higher data rate signal having a data rate equal to the conversion rate. Sample rate conversion is thus performed in real time according to the higher data rate clock, rather than with fixed ratios. As a result, when the higher data rate clock is affected by, for example, jitter or other frequency variations, the higher data rate samples immediately track the lower data rate samples. This helps to insure that the output higher data rate data tracks the lower rate data, thus providing a more accurate sample rate conversion.

REFERENCES:
patent: 5471411 (1995-11-01), Adams et al.
patent: 5644677 (1997-07-01), Park et al.
patent: 6772022 (2004-08-01), Farrow et al.
patent: 2003/0161486 (2003-08-01), Wu et al.
Sangil Park, ‘A Real-Time Method for Sample-Rate Conversion from CD to DAT’, ICCE 90. IEEE 1990 Conference on Consumer Electronics, Jun. 1990; pp. 360-361.

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