A system for creating a comfort noise signal, said system includes a
clipping circuit, a comfort noise generator, and a switch. The clipping
circuit receives a near-end signal, a far-end signal and a residual
signal. The clipping circuit determines the power of the far-end signal,
the power of the near-end signal and the power of the residual signal. The
clipping circuit determines the ratio of the power of the near-end signal
to the residual signal and whether the ratio is less than a predetermined
threshold. A comfort noise determination block is coupled to the residual
signal and selectively forms a comfort noise signal. A switch is coupled
to the comfort noise determination block and the clipping circuit. The
switch is activated to transmit the comfort noise signal whenever the
ratio of the power of the near-end signal to the residual signal is less
than a predetermined threshold.
