Selectively adaptable far-end echo cancellation in a packet voice system
AssigneeBroadcom Corporation
InventorWilfred LeBlanc
Life of this patent
Estimating the term…
Abstract
A packet voice transceiver adapted to reside at a first end of a communication network and to send an ingress communication signal comprising voice packets to, and receive an egress communication signal comprising voice packets from, a second packet voice transceiver residing at a second end of the communication network. The packet voice transceiver includes a far-end echo canceller that reduces echo that is present in the egress communication signal. The far-end communicates with other functional components of the transceiver system and cancels echo or refrains from canceling echo based on the activity of the other functional components.
Claims18
A packet voice transceiver adapted to reside at a first end of a communication network and to send an ingress communication signal comprising voice packets to, and receive an egress communication signal comprising voice packets from, a second packet voice transceiver residing at a second end of the communication network, the packet voice transceiver comprising:
- a comfort noise generator operable to generate comfort noise when the egress communication signal does not contain active voice packets;
- and
- a far-end echo canceller operable to reduce echo that is present in the egress communication signal, wherein the far-end echo canceller is adapted to refrain from canceling echo in the egress communication signal if the comfort noise generator is generating comfort noise.
(canceled)
A packet voice transceiver adapted to reside at a first end of a communication network and to send an ingress communication signal comprising voice packets to, and receive an egress communication signal comprising voice packets from, a second packet voice transceiver residing at a second end of the communication network, the packet voice transceiver comprising:
- a comfort noise generator operable to generate comfort noise when the egress communication signal does not contain active voice packets;
- and
- a far-end echo canceller operable to reduce echo that is present in the egress communication signal based on an adaptive echo path model, wherein the far-end echo canceller is operable to freeze adaptation of the echo path model if the comfort noise generator is generating comfort noise.
6-20. (canceled)
A method of operating a packet voice transceiver configured to reside at a first end of a communication network and to send an ingress communication signal comprising voice packets to, and receive an egress communication signal comprising voice packets from, a second packet voice transceiver residing at a second end of the communication network, the method comprising:
- generating comfort noise when the egress communication signal does not contain active voice packets;
- when comfort noise is not being generated, reducing echo that is present in the egress communication signal;
- and
- when comfort noise is being generated, refraining from reducing echo in the egress communication signal.
A method of operating a packet voice transceiver configured to reside at a first end of a communication network and to send an ingress communication signal comprising voice packets to, and receive an egress communication signal comprising voice packets from, a second packet voice transceiver residing at a second end of the communication network, the method comprising:
- generating comfort noise when the egress communication signal does not contain active voice packets;
- reducing echo that is present in the egress communication signal based on an adaptive echo path model;
- and
- when comfort noise is being generated, freezing adaptation of the echo path model.
A packet voice transceiver adapted to reside at a first end of a communication network and to send an outbound communication signal comprising voice packets to, and receive an inbound communication signal comprising voice packets from, a second packet voice transceiver residing at a second end of the communication network, the packet voice transceiver comprising:
- a comfort noise generator operable to generate comfort noise when the inbound communication signal does not contain active voice packets;
- and
- a far-end echo canceller operable to reduce echo that is present in the inbound communication signal, wherein the far-end echo canceller is adapted to refrain from canceling echo in the inbound communication signal if the comfort noise generator is generating comfort noise.
A packet voice transceiver adapted to reside at a first end of a communication network and to send an outbound communication signal comprising voice packets to, and receive an inbound communication signal comprising voice packets from, a second packet voice transceiver residing at a second end of the communication network, the packet voice transceiver comprising:
- a comfort noise generator operable to generate comfort noise when the inbound communication signal does not contain active voice packets;
- and
- a far-end echo canceller operable to reduce echo that is present in the inbound communication signal based on an adaptive echo path model, wherein the far-end echo canceller is operable to freeze adaptation of the echo path model if the comfort noise generator is generating comfort noise.
A method of operating a packet voice transceiver configured to reside at a first end of a communication network and to send an outbound communication signal comprising voice packets to, and receive an inbound communication signal comprising voice packets from, a second packet voice transceiver residing at a second end of the communication network, the method comprising:
- generating comfort noise when the inbound communication signal does not contain active voice packets;
- when comfort noise is not being generated, reducing echo that is present in the inbound communication signal;
- and
- when comfort noise is being generated, refraining from reducing echo in the inbound communication signal.
A method of operating a packet voice transceiver configured to reside at a first end of a communication network and to send an outbound communication signal comprising voice packets to, and receive an inbound communication signal comprising voice packets from, a second packet voice transceiver residing at a second end of the communication network, the method comprising:
- generating comfort noise when the inbound communication signal does not contain active voice packets;
- reducing echo that is present in the inbound communication signal based on an adaptive echo path model;
- and
- when comfort noise is being generated, freezing adaptation of the echo path model.
Dependencies are inferred from the claim text.