Method and apparatus for processing digital signal

Details Method and apparatus for processing digital signal Method and apparatus for processing digital signal

1989-02-28

1991-12-03

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

341 76, H04B 1406

Patent

active

050705156

ABSTRACT:
A method and an apparatus for processing a digital signal by calculating a predictive error, then requantizing the predictive error thus obtained, and correcting the spectral form of requantization noise generated in quantizing the predictive error, wherein the spectral form of such requantization noise is approximated to that of the input signal while being suppressed in the lower frequency band thereof. In particular, there is disclosed a digital signal processing apparatus comprising a predictive filter with a feedback loop, a requantizer for requantizing a difference signal between an input signal and the output signal of the predictive filter, and an inverse requantizer for requantizing the output signal of the requantizer with an inverse characteristic thereto and supplying the inversely requantized signal to the predictive filter, wherein the input signal of the requantizer and the output signal of the inverse requantizer supplied to the predictive filter are each weighted by a predetermined amount individually and then are outputted to the predictive filter.

REFERENCES:
patent: 4437087 (1984-03-01), Petr
patent: 4475227 (1984-10-01), Belfield
patent: 4571737 (1986-02-01), Nishitani et al.
patent: 4677423 (1987-06-01), Benvenuto et al.
patent: 4686512 (1987-08-01), Nakamura et al.

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