Sampling frequency converter including a sigma-delta modulator

Details Sampling frequency converter including a sigma-delta modulator Sampling frequency converter including a sigma-delta modulator

1992-04-13

1993-07-06

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328151, 328167, 307521, H03B 104

Patent

active

052257878

ABSTRACT:
Sampling frequency converter for converting the sampling frequency of a discrete-time signal (d.sub.i) from a first sampling frequency (f.sub.i) to a second sampling frequency (f.sub.o) by sample validation, the number of samples of the discrete-time signal being omitted (or repeated) per unit of time depending on the frequency difference between the first and second sampling frequencies, so that a validated sample sequence is developed with a third sampling frequency having a value f.sub.v which, in essence, is equal to the value f.sub.o (or f.sub.i), the converter including a frequency meter (52) for converting a frequency difference between the second (or first) and third sampling frequencies to a control signal (v.sub.c) which is a measurement for the frequency difference, a sigma-delta modulator (10) for converting the control signal to an at least binary decision signal (24), and a validation circuit (48) for omitting (or repeating) a sample from the discrete-time signal d.sub.i in response to the decision signal.

REFERENCES:
patent: 4965531 (1990-10-01), Riley
patent: 5119093 (1992-06-01), Vogt et al.
patent: 5128623 (1992-07-01), Gilmore

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