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Speech and Audio Processing in Adverse Environments pp 267–283Cite as

Nonlinear Echo Cancellation Based on Spectral Shaping

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Part of the book series: Signals and Communication Technology ((SCT))

Acoustic echo cancellation or suppression for hands-free cellphones is a challenging topic. One of the biggest problems is nonlinearity of the echo-path such as loudspeaker distortion and vibrations of the cellphone shell [4, 18, 19, 28]. When a speech signal with large power is injected into a small loudspeaker, the loudspeaker itself and many mechanical contacts in the shell generate distorted echo. Among the sources of nonlinearity (distortion), mechanical nonlinearity with shell vibrations is said to be the dominant factor [4].

This chapter presents a nonlinear echo canceller using spectral shaping based on a frequency-domain model of highly nonlinear residual echo [14]. In the next section, the residual-echo model based on the spectral correlation between the residual echo and the echo replica is developed from experimental results. An echo suppressor structure based on the new model is shown in Sec. 8.3. Evaluation results using a hands-free cellphone handset are demonstrated in Sec. 8.4.

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Authors and Affiliations

  1. Common Platform Software Research Laboratories, NEC Corporation, Kawasaki, Japan

    Osamu Hoshuyama & Akihiko Sugiyama

Authors
  1. Osamu Hoshuyama
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  2. Akihiko Sugiyama
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Editor information

Editors and Affiliations

  1. Technische Universität, Darmstadt, Germany

    Eberhard Hänsler

  2. Harman/Becker Automotive Systems, Ulm, Germany

    Gerhard Schmidt

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Hoshuyama, O., Sugiyama, A. (2008). Nonlinear Echo Cancellation Based on Spectral Shaping. In: Hänsler, E., Schmidt, G. (eds) Speech and Audio Processing in Adverse Environments. Signals and Communication Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-70602-1_8

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  • DOI: https://doi.org/10.1007/978-3-540-70602-1_8

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-70601-4

  • Online ISBN: 978-3-540-70602-1

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