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Original Article

Contributions of binaural information to the separation of different sound sources

Contribuciones de la información binaural en la separación de diferentes fuentes sonoras

Pages 20-24 | Published online: 07 Jul 2009
 

Abstract

Binaural hearing aids potentially provide binaural cues that can improve the dectability and the spatial separation of multiple sound sources. This paper considers the use of binaural cues and the resultant spatial percepts on listeners’ ability to separate simultaneous sound sources. In backgrounds with continuous noise or multiple talkers, the main problem is the detection of individual acoustic components. On the other hand, if a single masking sound is very similar to the target, and both target and masker are spectro-temporally sparse, as is the case with speech, the main problem, at least for listeners with normal hearing, is to decide whether a particular spectro-temporal feature belongs to the target source and to track that source across time. Although the subjective location of a sound source can help in grouping features across time, its effect is most easily observed in the absence of other differences between the sound sources.

Acronyms
ITD=

Inter-aural time difference

Acronyms
ITD=

Inter-aural time difference

Sumario

Los auxiliares auditivos en ambos oídos potencialmente proveen claves binaurales que pueden mejorar la detectabilidad y la separación espacial de múltiples fuentes sonoras. Este trabajo considera el uso de claves binaurales y la percepción espacial resultante en la habilidad de los oyentes para separar fuentes sonoras simultáneas. En ambientes con ruido continuo o múltiples hablantes, el problema principal es la detección de componentes acústicos individuales. Por otro lad, si un sonido enmascarante único es muy similar al objetivo y tanto el objetivo como el sonido enmascarante son pobres en el espectro temporal, como es el caso del lenguaje, el problema principal, al menos para los normoyentes, es decidir si cierta característica del espectro temporal pertenece a la fuente objetivo y rastrear esa fuente en el tiempo. Aunque la localización subjetiva de una fuente sonora puede ayudar a agrupar características a través del tiempo, su efecto es observado más fácilmente en ausencia de otras diferencias entre las fuentes sonoras.

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