ECHO CANCELLATION USING GAIN CONTROL
A device for reducing echo by controlling microphone and/speaker gain in a telecommunications system is disclosed. An exemplary embodiment of the device may have an echo detector, echo level detector, and a gain controller. The echo detector detects an echo in a transmitted audio communication signal. The echo level detector determines the volume level of the detected echo. The gain control may adjust the gain of a microphone transmitting and/or speaker broadcasting the audio communication signal based on the echo level detected. The gain control and echo cancellation may cooperate with each other.
1 . A device for reducing echo by controlling microphone and speaker gain in a telecommunications system comprising:
an echo detector for detecting an echo in a transmitted audio communication signal;
an echo level detector for determining the volume level of the detected echo; and
a gain control for adjusting the gain of a microphone transmitting the audio communication signal based on the echo level detected.
2 . A device of claim 1 , wherein the gain is reduced based on the echo level detected.
3 . A device of claim 1 , further comprising:
a gain control for adjusting the gain of a speaker on a transmitting end based on the echo level detected.
4 . A device of claim 1 , further comprises:
a dynamic echo cancellation filter for reducing the echo introduced into the audio communication signal.
5 . A device of claim 1 , further comprises:
a dynamic echo cancellation filter for reducing the echo introduced into the audio communication signal and working in cooperation with the gain control.
6 . A device of claim 1 , wherein the echo detector, the echo level detector, and the gain control are housed within the telephone receiving the transmitted audio communication signal.
7 . A device of claim 1 , wherein the echo is a hybrid echo and delay echo.
8 . A method for reducing echo by controlling gain in a telecommunications system comprising the acts of:
detecting an echo in a transmitted audio communication signal;
determining the volume level of the detected echo; and
adjusting the gain of a microphone transmitting the audio communication signal based on the echo level detected wherein a gain control and an echo canceller cooperate with one another.
9 . A method of claim 8 , further comprising the act of:
adjusting the gain of a speaker on a transmitting end of the audio communication signal based on the echo level detected.
10 . A method of claim 8 , wherein the gain is reduced by increments of eight decibels based on the echo level detected.
11 . A method of claim 8 , further comprises:
removing echo introduced into the audio communication signal by dynamically filtering the audio communication signal.
12 . A method of claim 8 , further comprises:
removing echo introduced into the audio communication signal by dynamically filtering the audio communication signal; and
working in cooperation with the act of adjusting gain control.
13 . A method of claim 8 , wherein the echo detection and the echo level determination are performed within the telephone receiving the transmitted audio communication signal.
14 . A method of claim 8 , wherein the echo is a hybrid echo and delay echo.
15 . A computer program product, tangibly embodied in an information carrier, for reducing echo by controlling microphone and speaker gain in a telecommunications system, the computer program product being operable to cause a machine to:
detect an echo in a transmitted audio communication signal;
determine the volume level of the detected echo; and
adjust the gain of a microphone transmitting the audio communication signal based on the echo level detected; and
adjusting the gain of a speaker on a transmitting end of the audio communication signal based on the echo level detected wherein a gain control and an echo canceller cooperate with one another.
16 . A computer program product of claim 15 , wherein the gain is reduced based on the echo level detected.
17 . A computer program product of claim 15 , wherein the gain is reduced by increments of eight decibels based on the echo level detected.
18 . A computer program product of claim 15 , further comprising to cause a machine to:
remove echo introduced into the audio communication signal by dynamically filtering the audio communication signal.
19 . A computer program product of claim 15 , further comprising to cause a machine to:
remove echo introduced into the audio communication signal by dynamically filtering the audio communication signal; and
work in cooperation with the act of adjusting gain control.
20 . A computer program product of claim 15 , wherein the echo detection and the echo level determination are performed within the telephone receiving the transmitted audio communication signal.