Echo cancellation with quantization compensation

摘要

An apparatus having a first circuit and a second circuit is disclosed. The first circuit is configured to generate a first intermediate signal by expanding a first input signal subjected to a quantization. The second circuit is configured to generate a second intermediate signal based on a second input signal. The second intermediate signal approximates an echo in the first input signal caused by the second input signal. The second circuit is also configured to generate a third intermediate signal by companding the second intermediate signal to compensate the quantization of the first input signal.

主权项

1. An apparatus comprising:
a control circuit configured to generate one or more selective control signals; a first circuit configured to generate a first intermediate signal by expanding a first input signal subjected to a quantization; and a second circuit configured to (i) generate a second intermediate signal based on a second input signal, wherein said second intermediate signal approximates an echo in said first input signal caused by said second input signal, and (ii) generate a third intermediate signal by selectively companding said second intermediate signal to compensate said quantization of said first input signal, said selective companding a result of receiving a selective control signal, wherein said first circuit and said second circuit are implemented as hardware or a combination of hardware and software.