Full-duplex echo cancellation
AssigneeCable Television Labories, Inc.
InventorsThomas Holtzman Williams, Belal Hamzeh, Luis Alberto Campos
Life of this patent
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Abstract
Facilitating echo cancellation within communication networks is contemplated, such as but not necessarily limited to facilitating echo cancellation within full-duplex (FDX) communication networks. The echo cancellation may optionally be performed with an echo canceller included as part of or otherwise associated with an FDX node used to facilitate interfacing signaling between a digital domain and an analog domain of a FDX or other communication network.
Claims21
A method for echo cancellation in a communication network, the method comprising:
- estimating an echo anticipated to occur within the communication network for a first signal;
- generating a cancellation for the echo;
- and
- applying the cancellation to a reflection of the first signal, in an analog domain of the communication network, to generate an analog residual signal;
- converting the analog residual signal to a digital residual signal;
- and
- combining a digital cancelation signal with the digital residual signal to at least partially cancel residual reflection included with the digital residual signal.
A method for echo cancellation in a communication network, the method comprising:
- estimating an echo anticipated to occur within the communication network for a first signal, based on a second signal within a digital domain of the communication network;
- generating a cancellation for the echo;
- applying the cancellation to a reflection of the first signal, in an analog domain of the communication network;
- generating a third signal by using an equalizer to process the second signal;
- and
- performing digital-to-analog (D-A) conversion of the third signal to a fourth signal, the fourth signal being the cancellation applied to the reflection.
A method for echo cancellation in a communication network, the method comprising:
- estimating an echo anticipated to occur within the communication network for a first signal, based on a second signal within a digital domain of the communication network;
- generating a cancellation for the echo;
- applying the cancellation to a reflection of the first signal, in an analog domain of the communication network;
- performing digital-to-analog (D-A) conversion of the second signal to the first signal;
- and
- transporting the first signal from a first D-A converter performing the D-A conversion of the second signal to the first signal to a modem downstream of the first D-A converter, without amplification along a signaling path defined therebetween, the reflection occurring within the signaling path.
A communication system having echo cancellation capability, the communication system comprising:
- a digital network configured to communicate signaling within a digital domain;
- an analog network configured to communicate signaling in an analog domain;
- and
- a node for interfacing signaling between the digital domain and the analog domain, the node including an echo canceller configured to cancel a reflection received at the node in response to an analog signal previously transmitted therefrom by combining an analog cancellation signal with the reflection, the echo canceller including:
- i) an equalizer configured to generate a first digital signal based on an echo expected in response to transmission of the analog signal from the node,
- ii) a digital-to-analog (D-A) converter configured to convert the first digital signal to the analog cancellation signal,
- iii) a combiner configured to combine the analog cancellation signal with the reflection, and
- iv) an analog-to-digital (A-D) converter configured to convert an output from the combiner to a second digital signal.
A communication network node, comprising:
- a first digital-to-analog (D-A) converter configured to convert a first digital signal to a first analog signal;
- a splitter configured to output the first analog signal to an analog network for transmission to a recipient;
- an equalizer configured to generate a second digital signal based on an echo expected in response to transmission of the first analog signal from the communication network node;
- a second D-A converter configured to convert the second digital signal to an analog cancellation signal;
- and
- a combiner configured to generate a second analog signal by combining the analog cancellation signal with a reflection received at the splitter following transmission of the first analog signal therefrom.
Dependencies are inferred from the claim text.