Noise reduction method and apparatus utilizing filtering of a di

Details Noise reduction method and apparatus utilizing filtering of a di Noise reduction method and apparatus utilizing filtering of a di

1996-04-18

1998-06-30

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704212, 704225, 704226, 704227, 704228, 704229, 704230, H03M 120, H03M 100, H04N 521

Patent

active

057748420

ABSTRACT:
A noise reducing method and apparatus for reducing quantization error or noise generated on quantizing input signals, such as digital audio signals, wherein a dither signal concentrated in signal energy in the low frequency range is summed to the input signal and the resulting sum signal is sent to a quantizer. The quantizer error generated in the quantizer is fed back via a noise filter to the input side of the quantizer. The resulting signal has a smoothed noise floor and has noise components suppressed in a frequency range to which the human hearing mechanism exhibits high sensitivity, thus realizing the sound quality comparable to that of the input signal which prevailed prior to noise shaping.

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