Noise shaping circuit and noise shaping method

Details Noise shaping circuit and noise shaping method Noise shaping circuit and noise shaping method

1995-05-02

1996-02-20

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from differential codes

341200, 395 224, 395 235, 395 239, H03M 300

Patent

active

054932963

ABSTRACT:
A noise shaping circuit and a noise shaping method, in which a quantization error generated in a requantizer is taken out at a subtractive node and fed back to an input of the requantizer via a noise filter. A dc detector detects if the input signal from an input terminal is of a dc value including zero. If the input signal is detected to be a dc signal, the feedback quantity is reset to zero to prevent the oscillation by the limit cycle and to prevent the hunting phenomenon from occurring.

REFERENCES:
patent: 4622537 (1986-11-01), Aiko
patent: 4937576 (1990-06-01), Yoshio et al.
patent: 5204677 (1993-04-01), Akagiri et al.
patent: 5252973 (1993-10-01), Masuda
Patent Abstracts of Japan, vol. 16, No. 364, Aug. 6, 1992 corres. to Japanese Appln. JP-4115722.

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