Patent ID: 7610197

Claim:
An apparatus for comfort noise generation in a speech communication system, comprising a decoder configured to receive a plurality of information frames indicative of speech plus background noise; estimate one or more background noise characteristics based on the plurality of information frames wherein E bgn ⁡ ( m , i ) = { E ch ⁡ ( m , i ) ; E ch ⁡ ( m , i ) < E bgn ⁡ ( m - 1 , i ) E bgn ⁡ ( m - 1 , i ) + Δ 1 ; ( E ch ⁡ ( m , i ) - E bgn ⁡ ( m - 1 , i ) ) > E voice E bgn ⁡ ( m - 1 , i ) + Δ 2 ; otherwise and wherein: E bgn (m,i) is an estimated background noise energy value of an i th frequency channel of an m th frame of the plurality of information frames, E ch (m,i) is a estimated channel energy value of the i th frequency channel of the m th frame of the plurality of information frames, E bgn (m−1,i) is an estimated background noise energy value of the i th frequency channel of the (m-1) th frame of the plurality of frequency frames, Δ 1 is a first incremental energy value, Δ 2 is a second incremental energy value, and E voice .is an energy value indicative of voice energy; and generate a comfort noise signal based on the one or more background noise characteristics.