Filter and process for reducing noise in audio signals

Details Filter and process for reducing noise in audio signals Filter and process for reducing noise in audio signals

1995-12-28

1998-10-20

Zele, Krista

Multiplex communications

Duplex

Transmit/receive interaction control

379406, 379416, 370269, 370286, 370289, 395 242, H04B 320, H04M 908

Patent

active

058257543

ABSTRACT:
A noise reduction filter (28) is provided. The noise reduction filter (28) comprises a signal analysis block (30). The signal analysis block (30) is operable to receive an input audio signal and to determine a short term signal level. A noise floor block (32) is coupled to the signal analysis block (30). The noise floor block (32) is operable to receive the short term signal level from the signal analysis block (30) and to determine a noise floor level based upon the value of the short term signal level. A noise factor block (34) is coupled to the signal analysis block (30) and to the noise floor block (32). The noise factor block (34) is operable to receive the short term signal level and the noise floor level and operable to calculate a noise factor. A multiplier node (36) is coupled to the noise factor block (34) and receives the input audio signal. The multiplier node (36) is operable to multiply the input audio signal by the noise factor and to provide a noise reduced output signal as an output of the noise reduction filter (28).

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