Improved perception of speech in noise and Mandarin tones with acoustic simulations of harmonic coding for cochlear implants.
J Acoust Soc Am
; 132(5): 3387-98, 2012 Nov.
Article
en En
| MEDLINE
| ID: mdl-23145619
ABSTRACT
Harmonic and temporal fine structure (TFS) information are important cues for speech perception in noise and music perception. However, due to the inherently coarse spectral and temporal resolution in electric hearing, the question of how to deliver harmonic and TFS information to cochlear implant (CI) users remains unresolved. A harmonic-single-sideband-encoder [(HSSE); Nie et al. (2008). Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing; Lie et al., (2010). Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing] strategy has been proposed that explicitly tracks the harmonics in speech and transforms them into modulators conveying both amplitude modulation and fundamental frequency information. For unvoiced speech, HSSE transforms the TFS into a slowly varying yet still noise-like signal. To investigate its potential, four- and eight-channel vocoder simulations of HSSE and the continuous-interleaved-sampling (CIS) strategy were implemented, respectively. Using these vocoders, five normal-hearing subjects' speech recognition performance was evaluated under different masking conditions; another five normal-hearing subjects' Mandarin tone identification performance was also evaluated. Additionally, the neural discharge patterns evoked by HSSE- and CIS-encoded Mandarin tone stimuli were simulated using an auditory nerve model. All subjects scored significantly higher with HSSE than with CIS vocoders. The modeling analysis demonstrated that HSSE can convey temporal pitch cues better than CIS. Overall, the results suggest that HSSE is a promising strategy to enhance speech perception with CIs.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Enmascaramiento Perceptual
/
Acústica del Lenguaje
/
Percepción del Habla
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Fonética
/
Procesamiento de Señales Asistido por Computador
/
Implantes Cocleares
/
Ruido
Tipo de estudio:
Prognostic_studies
Límite:
Humans
Idioma:
En
Revista:
J Acoust Soc Am
Año:
2012
Tipo del documento:
Article
País de afiliación:
Estados Unidos