Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Frequency or repetition rate conversion or control
Patent
1993-11-15
1995-08-29
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Frequency or repetition rate conversion or control
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".
Callahan Timothy P.
Ferguson Jr. Gerald J.
Kabushiki Kaisha Kenwood
Le Dinh
Robinson Eric J.
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