LABORATORIO DE COMUNICACIÓN ORAL
ROBERT WAYNE NEWCOMB
R.Martinez, A. Álvarez, V. Nieto, V. Rodellar and P. Gómez
- "Implementation of an Adaptative Noise Canceler on the TMS320C31-50 for Non-Stationary Enviroments". --
- 13th International Conference on Digital Signal Processing, DSP'97:
- Santorini, Greece, 2-4 July, 1997.
The results of the implementation of an Adaptive Noise Cancelling Algorithm
for Speech Enhancement on a DSP platform are presented and discussed. Various
algorithms where implemented and compared, but Time-domain methods related with
Recursive Least Squares Lattice-Ladder Filters with a posteriori updating showed
the best cancelling behaviour, although at a higher computational cost, therefore,
an optimised version of these filters was implemented for the DSP card.
The influence of microphonic separation is also evaluated. The best results are
obtained for cardioid microphones with a separation of around 20 cm. taking
advantage of their angular properties to prevent speech crosstalk in the reference
microphone, thus reducing the computational cost required to acceptable limits.
This result is very important, since it ensures real time performance of the
algorithm in a single-DSP card (farther distances involve more filter stages,
which implies a higher computational cost).
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Madrid a 9 de junio de 2004