Use of non-audible band to relay information for echo cancellation in a distributed media system

An apparatus comprising:

• one or more processors;
• and
• logic encoded in one or more tangible media for execution by the one or more processors and when executed operable to:
• receive, at a first location, a far end voice signal from a sound source at a second location;
• adding a non-audible signal to the far end voice signal to create a composite signal;
• provide the composite signal to one or more speakers;
• detect the non-audible signal in the composite signal after the composite signal is received at one or more microphones after being output by the one or more speakers, the non-audible signal allowing an attenuator to attenuate a microphone signal including the composite signal from a particular microphone in response to the detected non-audible signal to reduce far end echo.

Software encoded in one or more computer-readable media for execution by the one or more processors and when executed operable to:

• receive a relayed voice signal from a sound source via a relay device;
• add a non-audible signal to the relayed voice signal to create a composite signal;
• provide the composite signal to the speakers;
• detect the non-audible signal in the composite signal after the composite signal is received at one or more of the microphones;
• and
• adjust a particular microphone's sensitivity in response to the detected non-audible signal at the particular microphone.