Methods and apparatus for providing comfort noise in communicati

Details Methods and apparatus for providing comfort noise in communicati Methods and apparatus for providing comfort noise in communicati

1998-01-09

2000-12-19

Chan, Wing F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379407, H04M 908, H04M 900, H04M 124

Patent

active

061636088

ABSTRACT:
Methods and apparatus for parametrically modeling background noise and generating comfort noise in echo suppression systems are disclosed. According to exemplary embodiments, a background noise model is based on a set of noise model parameters which are in turn based on measurements of actual background noise in an echo suppression system. The exemplary embodiments include autoregressive, autoregressive moving-average and frequency-domain models. An exemplary first-order autoregressive moving-average model includes a single fixed zero and a single variable pole. The single zero and the single pole are sufficient to provide appropriate spectral tilt in the resulting modeled noise, and the single zero ensures that the model is unconditionally stable. Integration of the exemplary parametric noise models with various echo suppression devices is also disclosed.

REFERENCES:
patent: 5283784 (1994-02-01), Genter
patent: 5475731 (1995-12-01), Rasmusson
patent: 5630016 (1997-05-01), Swaminathan et al.

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