Patent
Communication terminal and communication method
Shuji Miyasaka,Kosuke Nishio,Ichiro Kawashima +2 more
- 21 Aug 2012
12
TL;DR: In this article, an encoder codes the audio signal for transmission to generate an output bitstream and transmits the generated output bit stream to another communication terminal; and a control unit controls, for the respective subbands, echo cancellation processing according to a reproduction band of at least one of the output audio signal and the audio signals for transmission.
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Abstract: A communication terminal includes a decoder which decodes an input bitstream received from another communication terminal, to generate an output audio signal and outputs the generated output audio signal to a speaker; and an echo canceller which obtains an input audio signal representing sound captured by a microphone placed in a space to which the speaker outputs the sound, and removes, for respective subbands, an echo component included in the obtained input audio signal and corresponding to the output audio signal, to generate an audio signal for transmission. An encoder codes the audio signal for transmission to generate an output bitstream and transmits the generated output bitstream to another communication terminal; and a control unit controls, for the respective subbands, echo cancellation processing according to a reproduction band of at least one of the output audio signal and the audio signal for transmission.
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Citations
Patent
Echo cancellation method and device
Wuzhou Zhan
- 04 Jun 2013
TL;DR: In this article, an echo cancellation method for low-band audio signals was proposed, which divides a to-be-processed audio signal into a high-band signal and a lowband signal.
6
Patent
Acoustic signal processing system capable of detecting double-talk and method
Dehghani Pejman,Brennan Robert L,James Ryan +2 more
- 14 Mar 2013
TL;DR: In this paper, an adaptive filter that filters a signal from a frequency band reservation module and generates a filter signal that is received by a subtractor is used by a double-talk indicator module to generate a control signal that indicates the presence of double talk.
6
Patent
Method and equipment for echo cancellation
Wuzhou Zhan
- 16 Apr 2014
TL;DR: In this article, a method for echo cancellation is proposed, which comprises the steps that sound signals to be processed are divided into high-band sound signals and low-band sounds.
5
Patent
Device and method for transmitting and receiving voice data in wireless communication system
Kyunghun Jung
- 22 Jun 2015
TL;DR: In this paper, a method for operating a transmission terminal for transmitting a voice signal comprises the steps of: generating sampling and bitrate request information including sampling information for determining a sampling rate of the voice signal and bit rate information to determine a bitrate of the signal, and transmitting the generated sampling information to a reception terminal; receiving, from the reception terminal, combined determination information obtained by at least one combination of the sampling rate determined on the basis of sampling information and the bitrate determined on basis of the bit-rate information.
5
Patent
Joint acoustic echo control and adaptive array processing
Haohai Sun
- 21 Nov 2016
TL;DR: In this paper, a system and method for joint acoustic echo control and adaptive array processing is proposed, comprising the decomposition of a captured sound field into N sub-sound fields, applying linear echo cancellation to each subsound field, selecting L subsound fields from the N sub sound fields, and applying non-linear audio echo cancellation.
4
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