A Twelve-Channel Digital Echo Canceler

Duttweiler, D.

doi:10.1109/tcom.1978.1094133

Cited by 188 publications

(80 citation statements)

References 6 publications

(4 reference statements)

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“…Higher value of ERLE gives better echo cancellation. According to ITU-T recommendation G.167 [2,5], the value of ERLE should be 30 dB for hands free telephones during double talk.…”

Section: Erle (Echo Return Loss Enhancement)mentioning

confidence: 99%

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Acoustic Echo Cancellation Using PEVD Based Adaptive Kalman Filter

Kothandaraman¹,

Pawani²,

Pachaiyappan³

et al. 2017

IJIES

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Abstract:In this paper a PEVD (Polynomial Eigen Value Decomposition) based adaptive kalman filter is proposed for Acoustic Echo Cancellation (AEC) in the presence of noise. Acoustic echo is the phenomenon when the speaker listens to his own voice after some delay while speaking to his fellow mate on a call. The presence of acoustic coupling between the loudspeakers and the near-end microphone signal produces an undesired acoustic echo, which reduces the speech quality. Existing AEC system implemented adaptive kalman filter which results in less output efficiency in the noisy environment. In the proposed method, the near end speech is separated from the acoustic echo as well as from the surrounding noise by using PEVD based adaptive kalman filter. Initially mixed microphone signal is pre-processed by Polynomial Eigen Value Decomposition which strongly de-correlates the signal and also de-correlates out the noise. The pre-processed signal is passed through adaptive kalman filter for estimation of the acoustic echo. The efficiency of the output is calculated using Echo Return Loss Enhancement (ERLE). If the ERLE lies in the range of 30-40 dB indicates the good echo cancellation. The simulations show that the proposed PEVD based adaptive kalman method provides higher cancellation of echo. The simulations are being carried out in Matlab 2016a.

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“…Higher value of ERLE gives better echo cancellation. According to ITU-T recommendation G.167 [2,5], the value of ERLE should be 30 dB for hands free telephones during double talk.…”

Section: Erle (Echo Return Loss Enhancement)mentioning

confidence: 99%

“…The estimated echo is subtracted from the microphone signal to cancel the echo [2][3][4]. The above adaptive filter fails in double talk situation where both the far-end and the near-end speech signals occur simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Echo Cancellation Using PEVD Based Adaptive Kalman Filter

Kothandaraman¹,

Pawani²,

Pachaiyappan³

et al. 2017

IJIES

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show abstract

“…Kelly Jr., dos Laboratórios da 8ell, propôs um sis tema adaptativo que foi mais tarde modificado por Sondhi [1] e mais recentemente por Duttweiler [3]. …”

Section: Irnplernentaçâounclassified

“…A diferença entre este sinal e o eco artificial será então [3], [5] com a pre sença deste novo dispositivo, para o qual o relacionamento entre entrada e saída é apresentado na F ig. 9.…”

Section: Influência De Ruído E Interferênciasunclassified

Canceladores de Eco

Féris¹

1986

Journal of Communication and Information Systems

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Neste trabalho analisa-se o funcionamento de canceladores de eco adaptativos. Estuda-se a otimização do controle de adaptação do dispositivo ao meio de transmissão. Discutem-se, também, 05 diagramas específicos de alguns fabricantes desse dispositivo. IntroduçãoA transformação de um sistema de dois para quatro fios é necessária para a transmissão de sinais telefônicos pelos métodos de multiplexagem analógica ou digital. Esta trans formação se faz utilizando-se dispositivos denominados junções híbridas. Entretanto, a utilização destes dispositivos acarreta o aparecimento de retorno do sinal, ou seja, eco, devido ao desequil íbrio dos mesmos. Este desequlhbrio acontece em razão da impossibilidade de se manter as impedâncias de todas as linhas tronco e de assinantes com um valor igual e imutável para todas elas.Este problema se tornou mais efetivo na era das comunicações via satélite, pois o in tervalo entre o sinal incidente e o refletido fica maior que meio segundo. Isto faz com que a comunicação telefônica se torne altamente desagradável.Para resolver o problema do eco tentou-se, inicialmente, a interrupção do caminho de retorno durante a conversa do assinante A, conforme esquematizado na Fig.

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“…During the double-talk, the near-end speech that behaves as the uncorrelated noise may cause the adaptive filter to diverge. For this reason, several double-talk detectors (DTDs) have been proposed for halting the adaptation [1][2][3][4]. It is difficult to distinguish between the double-talk and echo path change for these DTDs.…”

Section: Introductionmentioning

confidence: 99%

Improved transfer logic of two-path algorithm for acoustic echo cancellation

Wang¹,

Liu²

2013

Journal of Computer Applications

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Abstract-Adaptive echo cancellers with two-path algorithm are applied to avoid the false adaptation during the double-talk situation. In the two-path algorithm, several transfer logic solutions have been proposed to control the filter update. This paper presents an improved transfer logic solution. It improves the convergence speed of the two-path algorithm, and allows the reduction of the memory elements and computational complexity. Results of simulations show the improved performance of the proposed solution.

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A Twelve-Channel Digital Echo Canceler

Cited by 188 publications

References 6 publications

Acoustic Echo Cancellation Using PEVD Based Adaptive Kalman Filter

Acoustic Echo Cancellation Using PEVD Based Adaptive Kalman Filter

Canceladores de Eco

Improved transfer logic of two-path algorithm for acoustic echo cancellation

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