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 language | Portuguese |
---|---|
Title of host publication | XXXIX Simpósio Brasileiro de Telecomunicações e Processamento de Sinais |
Publisher | Sociedade Brasileira de Telecomunicações |
Pages | 1-5 |
Number of pages | 5 |
DOIs | |
Publication status | Published - 26 Sept 2021 |
Event | XXXIX Simpósio Brasileiro de Telecomunicações e Processamento de Sinais - Fortaleza, Brazil Duration: 26 Sept 2021 → 29 Sept 2021 |
Conference
Conference | XXXIX Simpósio Brasileiro de Telecomunicações e Processamento de Sinais |
---|---|
Abbreviated title | SBrT2021 |
Country/Territory | Brazil |
City | Fortaleza |
Period | 26/09/21 → 29/09/21 |
Keywords
- Feedback cancellation
- Cepstral method
- AFC-CE
- Forgetting factor
- Speech cepstrum