Nonlinear frequency compression: Influence of start frequency and input bandwidth on consonant and vowel recognition.
J Acoust Soc Am
; 139(2): 938-57, 2016 Feb.
Article
en En
| MEDLINE
| ID: mdl-26936574
ABSTRACT
By varying parameters that control nonlinear frequency compression (NFC), this study examined how different ways of compressing inaudible mid- and/or high-frequency information at lower frequencies influences perception of consonants and vowels. Twenty-eight listeners with mild to moderately severe hearing loss identified consonants and vowels from nonsense syllables in noise following amplification via a hearing aid simulator. Low-pass filtering and the selection of NFC parameters fixed the output bandwidth at a frequency representing a moderately severe (3.3 kHz, group MS) or a mild-to-moderate (5.0 kHz, group MM) high-frequency loss. For each group (n = 14), effects of six combinations of NFC start frequency (SF) and input bandwidth [by varying the compression ratio (CR)] were examined. For both groups, the 1.6 kHz SF significantly reduced vowel and consonant recognition, especially as CR increased; whereas, recognition was generally unaffected if SF increased at the expense of a higher CR. Vowel recognition detriments for group MS were moderately correlated with the size of the second formant frequency shift following NFC. For both groups, significant improvement (33%-50%) with NFC was confined to final /s/ and /z/ and to some VCV tokens, perhaps because of listeners' limited exposure to each setting. No set of parameters simultaneously maximized recognition across all tokens.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Percepción de la Altura Tonal
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Acústica del Lenguaje
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Inteligibilidad del Habla
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Percepción del Habla
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Calidad de la Voz
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Reconocimiento en Psicología
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Pérdida Auditiva
Tipo de estudio:
Diagnostic_studies
/
Prognostic_studies
Límite:
Adult
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Aged
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Aged80
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
J Acoust Soc Am
Año:
2016
Tipo del documento:
Article
País de afiliación:
Estados Unidos