Patent ID: 8467544
Filing Date: 2013-06-18
Classification: H04M

Abstract:
1. An echo prevention device comprising: an echo removing portion configured to be inputted with a first input signal and a second input signal including echo by the first input signal, and to output a signal obtained by removing or attenuating the echo included in the second input signal based on the first input signal; a noise removing portion configured to output a signal obtained by removing or attenuating noise included in the signal outputted from the echo removing portion; and a first output control portion configured to turn off noise removing processing at the noise removing portion so as to output the signal outputted from the echo removing portion as an output signal if a first signal level of echo included in the signal outputted from the echo removing portion is at a predetermined level or more, and to turn on the noise removing processing so as to output the signal outputted from the noise removing portion as an output signal if the first signal level is less than the predetermined level.