Patent ID: 7046795

Claim:
A system comprising: a waveform synthesizer; a delay element; and a waveform detector; wherein the system comprises a first set of signal paths and a second set of signal paths, the first set of signal paths comprising: a reference signal path from the waveform synthesizer to the delay element to the waveform detector; and a local channel signal path from the waveform synthesizer to the waveform detector via a local loudspeaker and a local microphone; the second set of signal paths comprising: a first signal path from a signal source to an acoustic echo canceller via the local loudspeaker and the local microphone; and a second signal path from the signal source to the delay element to the acoustic echo canceller; wherein the waveform detector comprises logic to detect a measure of time between receipt of a waveform generated by the waveform synthesizer via the reference signal path and receipt of the waveform generated by the waveform synthesizer via the local channel signal path; wherein the delay element is configured based on the waveform detector's detecting the measure of time between receipt of a waveform from the waveform synthesizer via the reference signal path and receipt of the waveform from the waveform synthesizer via the local channel signal path; and wherein the system selects the first set of signal paths to configure the delay element and wherein the system selects the second set of signal paths to process a telephony signal received from a remote site and a telephony signal being sent to the remote site.