Asynchronous sample rate tracker with multiple tracking modes

Details Asynchronous sample rate tracker with multiple tracking modes Asynchronous sample rate tracker with multiple tracking modes

1997-11-13

2000-07-18

Sheikh, Ayaz R.

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output data buffering

710 56, 710 57, 711150, 711168, G06F 1300

Patent

active

060921269

ABSTRACT:
An asynchronous sample rate tracker with rapid acquisition and good steady state performance is provided. In one embodiment, dual tracking loops are used to control reading from a FIFO sample buffer and generation of a ratio of source and local sampling rates. One tracking loop is used for rapid acquisition when the buffer is either empty or full with another tracking loop being used for steady-state operation. The steady-state tracking loop incorporates a low-pass filter to remove the effects of momentary variations in source sampling rates.

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Limberis, Alex et al., An Architecture for a . . . Dynamic Voice Allocation, Oct. 7-10, 1993, AES 95th Convention, New York.
Julius O. Smith et al., "A Flexible Sampling-Rate Conversion Method," IEEE International Conference On Acoustics, Speech, and Signal Processing, Mar. 1984, cover plus 19.4.1-19.4.4.

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