Patent ID: 7619995
Filing Date: 2009-11-17
Classification: H04L

Abstract:
1. A VoIP mixer for mixing a first input signal with a second input signal, the first and second input signals being signals having encoded therein a first and second correlation parameter, respectively, the VoIP mixer comprising: (a) a first decoder for receiving the first input signal and generating a first decoded signal, the first decoder extracting the first correlation parameter from the first input signal; (b) a second decoder for receiving the second input signal and generating a second decoded signal, the second decoder extracting the second correlation parameter from the second input signal; (c) a mixer coupled to the first and second decoders, the mixer receiving the first and second decoded signals and producing a mixed signal; (d) a parameter estimator coupled to the first and second decoders, the parameter estimator receiving the first and second correlation parameters and outputting an open loop parameter estimate; and (e) an encoder coupled to the mixer and the parameter estimator, the encoder receiving the mixed signal and the open loop parameter estimate and outputting an encoded signal, wherein the encoder includes a closed-loop analyzer for creating the encoded signal and wherein the closed-loop analyzer employs the open loop parameter estimate; wherein the correlation parameters include pitch data, the parameter estimator includes a pitch estimator, and the open loop parameter includes an open loop pitch estimate.