Sampling frequency converter

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Frequency or repetition rate conversion or control

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327117, 327 91, 341 61, H03M 730

Patent

active

054463980

ABSTRACT:
A sampling frequency converter capable of obtaining data sampled by sampled pulses having a sampling frequency of 2-, 4-, or 8-fold of 44.1 kHz without using an over-sampling filter. Input data sampled by sampling pulses having a sampling frequency of 32 kHz is over-sampled by a 3-fold by a first over-sampling filter, and down-sampled by a one-2nd-fold by a first down-sampling filter. One of input data sampled by sampling pulses having a sampling frequency of 48 kHz and the output of the first down-sampling filter is selected by a first selector. The output of the selector is over-sampled by a 147-fold by a second over-sampling filter, and down-sampled by a one-20th-fold by a second down-sampling filter. The output of the second down-sampling filter is down-sampled by one-2nd-, one-4th-, and one-8th-folds respectively by third, fourth, and fifth down-sampling filters. One of the outputs of the second to fifth down-sampling filters is selected by a second selector.

REFERENCES:
patent: 4472785 (1984-09-01), Kasuga
patent: 4903019 (1990-02-01), Ito
patent: 5227787 (1993-06-01), Kurashina
patent: 5327125 (1994-07-01), Iwase et al.
IEEE Transactions on Instrumentation and Measurement, vol. 36, No. 4, Dec. 1987, New York US pp. 979-982, XP32389 P. S. Tang et al. "Applications of a Multichannel Digital Waveform Recorder With Mixed and Switchable Sampling Rate".

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