Method and apparatus for randomized oversampling

Details Method and apparatus for randomized oversampling Method and apparatus for randomized oversampling

1996-07-02

1998-05-19

Chin, Wellington

Pulse or digital communications

Pulse code modulation

Correcting or reducing quantizing errors

375260, 375254, 375285, 341143, H03M 110

Patent

active

057545928

ABSTRACT:
An oversampling technique that improves signal-to-quantization noise ratio without requiring substantial amounts of processing power is disclosed. The oversampling technique determines the oversample values by successively scaling the previous value using a scaling factor. The effect of the invention is the randomize the quantization error for each of the oversample values so that the quantization error becomes uncorrelated from one oversample value to the next. When such decorrelation occurs, the quantization noise is spread over the enlarged frequency band associated with the oversampling. The invention is applicable to any transmission scheme which utilizes oversampling and digital-to-analog conversion.

REFERENCES:
patent: 5061925 (1991-10-01), Sooch et al.
patent: 5153593 (1992-10-01), Walden et al.
patent: 5369403 (1994-11-01), Temes et al.
patent: 5414424 (1995-05-01), Cabler
patent: 5446460 (1995-08-01), Cabler

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