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US 8,155,303 B2Granted
System and method for cancelling echo
AssigneeSolid Technologies, Inc.
InventorsChonghoon Kim, Yeongha Choi, Hyungchae Kim
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Abstract
A system and a method for canceling an echo is disclosed. In accordance with the system and the method, a plurality of independently and variably delayed adaptive algorithm blocks are selectively applied to a delayed feedback signal to generate a plurality of echo components in parallel, thereby canceling the echo component from an input signal.
Claims19
A system for canceling an echo component, comprising:
- a first complex correlator for subjecting an input signal and a delayed feedback signal to a correlation operation to periodically analyze a plurality of echo components;
- a first adaptive filter including a number of N adaptive algorithm blocks of a number of L taps and a number of N variable delaying means delay-inputting the delayed feedback signal to the adaptive algorithm blocks, the first adaptive filter outputting a first output signal obtained by adaptively canceling the plurality of echo components of the input signal;
- and
- a second complex correlator for monitoring an echo cancellation rate of the first adaptive filter by subjecting the delayed feedback signal and the first output signal to a correlation operation;
- wherein each of the adaptive algorithm blocks is allocated to a time period having a peak value larger than a predetermined value according to the correlation operation of the first complex correlator to generate each of the plurality of echo components by adjusting the variable delay means.
2 more elements
A wireless repeater for canceling an echo component, comprising:
- a receiving antenna for receiving a signal to be repeated;
- a received signal processor for converting the signal to be repeated received by the receiving antenna to an input signal via an intermediate frequency conversion and a digital conversion;
- a first complex correlator for subjecting the input signal and a delayed feedback signal to a correlation operation to periodically analyze a plurality of echo components;
- a first adaptive filter for allocating each of a plurality of adaptive algorithm blocks to a time period having a peak value larger than a predetermined value according to the correlation operation of the first complex correlator by receiving the input signal and the delayed feedback signal, the first adaptive filter generating each of the plurality of echo components and then outputting a first output signal obtained by adaptively canceling the plurality of echo components of the input signal;
- a second complex correlator for monitoring an echo cancellation rate of the first adaptive filter by subjecting the delayed feedback signal and the first output signal to a correlation operation;
- a transmission signal processor for converting the first output signal to a transmission signal via an analog conversion and an up-conversion;
- and
- a transmission antenna for transmitting the transmission signal.
5 more elements
A method for canceling an echo component, the method comprising steps of:
- (a) subjecting an input signal and a delayed feedback signal to a correlation operation to periodically analyze a plurality of echo components, utilizing a first complex correlator;
- and
- (b) allocating each of a plurality of adaptive algorithm blocks to a time period of the delayed feedback signal having a peak value larger than a predetermined value according to the correlation operation of the step (a) to generate each of the plurality of echo components and adaptively canceling the echo components from the input signal to generate a first output signal;
- and
- monitoring an echo cancellation rate of the first adaptive filter by subjecting the delayed feedback signal and the first output signal to a correlation operation, utilizing a second complex correlator.
2 more elements
Dependencies are inferred from the claim text.