Patent ID: 7649856
Filing Date: 2010-01-19
Classification: H04L

Abstract:
1. A system for transmitting a wideband speech signal, comprising: an A/D converter for receiving an analog speech signal to convert the analog speech signal into a digital speech signal; an acoustic echo canceller for receiving the digital speech signal and canceling echo of the digital speech signal; an encoder to receive the digital speech signal from which echo has been removed from the acoustic echo canceller to separate a baseband speech signal from the received signal, standard-coding the baseband speech signal to generate a standard baseband signal, coding a difference between the baseband speech signal and the standard baseband signal to generate an additional baseband signal, and coding a difference between a signal obtained by synthesizing the standard baseband signal and the additional baseband signal and the baseband speech signal to generate an enhancement residual band signal; and an IP network interface to receive the standard baseband signal, the additional baseband signal, and the enhancement residual band signal generated by the encoder, multiplexing the standard baseband signal, the additional baseband signal, and the enhancement residual band signal, and transmitting the multiplexed signals to an external IP network.