Artículos

 

Speech Enhancement with Local Adaptive Rank-Order Filtering

 

Mejora de voz con filtrado local adaptativo basado en estadísticas de orden

 

Vitaly Kober¹, Victor Diaz Ramirez², and Yuma Sandoval Ibarra²

 

¹ Computer Science Department, CICESE, Ensenada, B.C., Mexico. vkober@cicese.mx

² Instituto Politécnico Nacional, CITEDI, Tijuana, B.C., Mexico. vdiazr@ipn.mx, juma_san@hotmail.com

 

Abstract

A local adaptive algorithm for speech enhancement is presented. The algorithm is based on calculation of the rank-order statistics of an input speech signal over a moving window. The algorithm varies the size and contents of a sliding window signal as well as an estimation function employed for recovering a clean speech signal from a noisy signal. The algorithm improves the quality of a speech signal preserving its intelligibility. The performance of the algorithm for suppressing additive noise in an input test speech signal is compared with that of common speech enhancement algorithms in terms of objective metrics.

Keywords. Speech enhancement, local adaptive filtering, rank-order statistics, musical noise, intelligibility.

 

Resumen

Se presenta un algoritmo localmente adaptativo para la mejora de voz. El algoritmo, se basa en el cálculo de estadísticas de orden prioritario de una señal de voz dentro de una ventana deslizante. El algoritmo es localmente adaptativo ya que puede variar el tamaño y contenido de la señal dentro de la ventana deslizante así como también, la función de estimación usada para la recuperación de la señal limpia a partir de la señal ruidosa. El algoritmo propuesto mejora la calidad de la voz preservando la inteligibilidad del mensaje, e introduciendo únicamente ruido musical imperceptible. El desempeño del algoritmo propuesto es comparado con el desempeño de los algoritmos existentes en términos de varias métricas objetivas.

Palabras clave. Mejora de voz, filtrado local adaptativo, estadísticas de orden prioritario, ruido musical, inteligibilidad.

 

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