Sampling frequency converter

Details Sampling frequency converter Sampling frequency converter

1995-02-21

1996-06-18

Envall, Jr., Roy N.

Boots, shoes, and leggings

36472601, 341123, G06F 1531, H03M 100

Patent

active

055285279

ABSTRACT:
A sampling frequency converter capable of performing an operation of multiplications and additions at a lower speed and realizing with a small amount of hardware. The sampling frequency converter for converting input data sampled at a sampling frequency M into data sampled at sampling frequency N, includes: a non-cyclic digital filer including a memory for sequentially putting and storing E data elements in response to clocks of the sampling frequency M, and reading the stored E data elements in parallel and in response to each clock of the sampling frequency M, a plurality of coefficient multipliers for selecting E coefficients in response to each clock of the sampling frequency N, the E coefficients being extracted from (J*E/M) coefficients every (J/M)-th where J is the least common denominator of M and N, and multiplying each data element read from the memory by a corresponding one of the selected coefficients, and an adder for adding the multiplication results by the coefficient multipliers together; and a sampler for sampling an output of the non-cyclic digital filter at the sampling frequency N.

REFERENCES:
patent: 4817025 (1989-03-01), Asai et al.
patent: 4990911 (1991-02-01), Fujita et al.

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