Uma análise do método cepstral de cancelamento de realimentação acústica

Marcelo Carsten Amaral*, Pedro Miguel Rodrigues*, Bruno Catarino Bispo*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

14 Downloads

Abstract

This work analyzes the cepstral method for acoustic feedback cancellation. It is shown that the adaptive filter error is composed of the sum of two terms. The first is related only to the feedback path and tends to zero, converging more quickly to smaller values of the forgetting factor. The second is related to the input signal cepstra and the gain of the reinforcement system, containing a weighted sum of the cepstra where the weights are powers of the forgetting factor. Simulations showed that, for speech signals, the weighted sum of the cepstra converges, a preponderant fact for the method convergence. The convergence speed, the value after the convergence and the oscillations around this value of the second term decrease with the increase of the forgetting factor, behaviors directly reflected in the filter error. In the first iterations, the first term has the greatest influence. After a few iterations, the second term governs the method performance.
Original languagePortuguese
Title of host publicationXXXIX Simpósio Brasileiro de Telecomunicações e Processamento de Sinais
PublisherSociedade Brasileira de Telecomunicações
Pages1-5
Number of pages5
DOIs
Publication statusPublished - 26 Sept 2021
EventXXXIX Simpósio Brasileiro de Telecomunicações e Processamento de Sinais - Fortaleza, Brazil
Duration: 26 Sept 202129 Sept 2021

Conference

ConferenceXXXIX Simpósio Brasileiro de Telecomunicações e Processamento de Sinais
Abbreviated titleSBrT2021
Country/TerritoryBrazil
CityFortaleza
Period26/09/2129/09/21

Keywords

  • Feedback cancellation
  • Cepstral method
  • AFC-CE
  • Forgetting factor
  • Speech cepstrum

Cite this