Detection of acoustic echo cancellation
AssigneeImagination Technologies Limited
InventorsSenthil Kumar Mani, Srinivas Akella, Anupama Ghantasala
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Abstract
An echo cancellation detector for controlling an acoustic echo canceller that is configured to cancel an echo of a far-end signal in a near-end signal in a telephony system, the echo cancellation detector comprising a comparison generator configured to compare the far-end signal with the near-end signal, a decision unit configured to make a determination about a first acoustic echo canceller based on that comparison and a controller configured to control an operation of a second acoustic echo canceller in dependence on the determination.
Claims18
A communication device comprising:
- a first acoustic echo canceller configured to receive a microphone signal and to produce a near-end signal;
- a second acoustic echo canceller configured to receive the near-end signal and to cancel an echo of a far-end signal that is present in the near-end signal before it is transmitted from the communication device to a far-end communication device;
- and
- an echo cancellation detector for controlling the second acoustic echo canceller, the echo cancellation detector comprising:
- a comparison generator configured to compare the far-end signal with the near-end signal;
- a decision unit configured to, based on the comparison, make a determination that the first acoustic echo canceller is underperforming;
- and
- a controller configured to, in dependence on the determination, control the second acoustic echo canceller to be in a state in which it is operating so as to cancel the echo of the far-end signal from the near-end signal to produce an echo cancelled near-end signal to be transmitted to the far-end communication device.
An echo cancellation detector for controlling a second acoustic echo canceller that is configured to, before an echo-cancelled near-end signal is to be transmitted from a near-end communication device to a far-end communication device, cancel the echo of a far-end signal that is present in the near-end signal, the echo cancellation detector comprising:
- a comparison generator configured to compare the far-end signal with the near-end signal;
- a decision unit configured to, based on the comparison, make a determination that a first acoustic echo canceller arranged to receive a microphone signal and to produce the near-end signal is underperforming;
- and
- a controller configured to, in dependence on the determination by the decision unit, control the second acoustic echo canceller at the near-end communication device to be in a state in which it is operating so as to cancel the echo of the far-end signal from the near-end signal to produce the echo-cancelled near-end signal to be transmitted to the far-end communication device.
A method for cancelling an echo of a far-end signal in a near-end signal from a first acoustic echo canceller arranged to receive a microphone signal and to produce the near-end signal, the method comprising:
- comparing the far-end signal with the near-end signal;
- based on the comparison, making a determination that the first acoustic echo canceller is underperforming;
- and
- in dependence on the determination, operating a second acoustic echo canceller to be in a state in which it is operating so as to, before an echo cancelled near-end signal is to be transmitted from a near-end communication device to a far-end communication device, cancel the echo of the far-end signal from the near-end signal to produce the echo cancelled near-end signal.
Dependencies are inferred from the claim text.