Patent ID: 6240070
Filing Date: 2001-05-29
Classification: H04M

Abstract:
A system for improving audio quality of conference calls placed over a network using lossy audio compression, comprising:means for receiving a plurality of compressed audio channels, each of the audio channels being compressed using a lossy compression algorithm;means for performing a decompression/compression transformation on the compressed audio channels to produce a compressed summation stream;means for selectively enabling one of the compressed audio channels to bypass the decompression/compression transformation means;wherein the decompression/compression transformation means includes:means for decompressing the compressed audio channels to produce a plurality of decompressed audio channels;means for summing the decompressed audio channels to produce the summation stream, said summing means including means for correlating each of the decompressed audio channels to the summation stream and determining the dominant channel based on comparing a plurality of correlation values derived from the decompressed audio channels; andmeans for compressing the summation stream to produce the compressed summation stream.