Audio spectral noise reduction method and apparatus

Details Audio spectral noise reduction method and apparatus Audio spectral noise reduction method and apparatus

2005-03-07

2010-06-22

Smits, Talivaldis I (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704SE21002, C704SE21009, C704SE21010, C704SE19046, C704S208000, C704SE15006, C704S248000

Reexamination Certificate

active

07742914

ABSTRACT:
A method of reducing noise in an audio signal, comprising the steps of: using a furrow filter to select spectral components that are narrow in frequency but relatively broad in time; using a bar filter to select spectral components that are broad in frequency but relatively narrow in time; analyzing the relative energy distribution between the output of the furrow and bar filters to determine the optimal proportion of spectral components for the output signal; and reconstructing the audio signal to generate the output signal. A second pair of time-frequency filters may be used to further improve intelligibility of the output signal. The temporal relationship between the furrow filter output and the bar filter output may be monitored so that the fricative components are allowed primarily at boundaries between intervals with no voiced signal present and intervals with voice components. A noise reduction system for an audio signal.

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