METHODS AND DEVICES FOR ENSURING COMFORT NOISE IN COMMUNICATION SYSTEMS Russian patent published in 2003 - IPC

FIELD: communication systems; echo-signal suppressors for bidirectional links. SUBSTANCE: according to one of alternatives background noise simulator is based on set of noise simulator parameters based in their turn on measurements of actual background noise in echosignal suppression system. Exemplified alternatives implementing this method include autoregressive simulator, autoregressive sliding mean simulator, and frequency region simulator. Exemplified first- order autoregressive sliding mean simulator includes fixed unit zero and variable unit pole. Unit zero and unit pole are sufficient to ensure respective spectrum deviation in simulated noise obtained and unit zero ensures that simulator is absolutely stable. Aggregate of exemplified parametric noise simulators incorporating various echo-signal suppressing devices are also given in description of invention. EFFECT: improved simulation of actual noise with respect to spectral content and volume to ensure comfort noise. 49 cl, 7 dwg