INTELLIGIBILITY
المؤلف:
John Field
المصدر:
Psycholinguistics
الجزء والصفحة:
P135
2025-09-01
427
INTELLIGIBILITY
Many factors affect the intelligibility of a speech signal. They include:
Intensity, perceived by the listener as loudness.
Background noise. For successful communication, the average speech level should exceed the noise level by 6 decibels (the S/N ratio should be þ 6Db). Below this, the listener becomes increasingly reliant upon contextual cues.
Restrictions in the frequency band. Telephone lines, for example, limit the range of frequencies transmitted to a band from 0 to 3000 Hz, removing many of the acoustic cues which indicate the sound [s]. Research has shown that no particular frequency band is essential to intelligibility. Conversation remains intelligible if a low-pass filter suppresses frequency components above 1800 Hz or if a high-pass filter suppresses components below that level. Because the speech signal contains a great deal of redundancy, a narrow frequency band of between 1000 and 2000 Hz (excised from the signal by a band-pass filter) can achieve 90 per cent intelligibility.
Other factors contributing to intelligibility relate to the individual speaker. They include the fundamental frequency of the speaker’s voice and the pitch range used; how precisely and how fast the speaker articulates; the frequency and length of pausing; and how familiar the listener is with the speaker’s accent.
See also: Speech signal
Further reading: Denes and Pinson (1993); Pickett (1999)
الاكثر قراءة في Linguistics fields
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