Background noise compensation in a telephone network

Abstract From the Canadian patent

24-, An automated method for modifying a speech signal in a telephone network by applying a gain factor which is a function of the level of backgroundnoise at a given destination and transmitting the modified speech signal to thedestination. The gain applied may be a function of both the background noise level and the original speech signal. Either a linear or a non-linear (e.g. compressed) amplification of the original speech signal may be performed where a compressedamplification results in the higher level portions of the speech signal being amplified by a smaller gain factor than lower level portions. The speech signal may be separated into a plurality of subbands each resultant subband …