Sampling rate conversion method and apparatus

Details Sampling rate conversion method and apparatus Sampling rate conversion method and apparatus

2005-01-25

2009-10-13

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S377000

Reexamination Certificate

active

07602875

ABSTRACT:
A sampling apparatus for converting first data, sampled at a first sampling rate, into second data, sampled at a second sampling rate. A FIFO storing the first data based on a write control signal and outputs the second data read out based on a read control signal indicating whether the second data is to be read out during the next time interval. The apparatus further includes a frequency detection unit for measuring the first clock signal during the current time interval to generate the value of the first current clock frequency, generating the value of a current predicted clock frequency from the value of the first current clock frequency and the value of the directly previously predicted clock frequency and for using the value of the current predicted clock frequency as the directly previously predicted clock frequency during the next time interval. A calculating unit generates the write control signal and read control signal from the value of a second current frequency, generated by measuring the second clock signal during the current time interval, to output the write and read control signal to the FIFO.

REFERENCES:
patent: 4860283 (1989-08-01), Takano et al.
patent: 5222108 (1993-06-01), Suzuki
patent: 5822327 (1998-10-01), Satou
patent: 2001/0014066 (2001-08-01), Koudo et al.
patent: 11-112440 (1999-04-01), None

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