Accession Number : ADA212480

Title :   The Effects of Hearing Loss on Speech Communication and the Perception of Other Sounds.

Descriptive Note : Final technical memo.,

Corporate Author : GALLAUDET UNIV WASHINGTON DC

Personal Author(s) : Suter, Alice H

PDF Url : ADA212480

Report Date : Jun 1989

Pagination or Media Count : 50

Abstract : Noise-induced hearing loss acts as a low-pass filter for individuals receiving speech sounds or warning signals. These losses can also cause some degree of distortion in the auditory system, necessitating a speech-to-noise ratio of up to 10 dB more favorable to achieve speech recognition comparable to a normal-hearing listener. These distortions may appear in the frequency, intensity, and temporal domains. Hearing in the high-frequency range is important for understanding speech in noisy conditions, or when speech has been distorted by, for example, reverberation or filtering. Recent research targets the point of beginning hearing handicap or 'low fence' as an average hearing threshold level between 15 and 30 dB for the audiometric frequencies 1000, 2000, and 3000 Hz. The effects of hearing impairment on speech may be estimated by various frequency-filter models, which need to be adjusted to account for the distortion component. There is lack of data on the ability of hearing-impaired listeners to detect and recognize warning signals, although predictions based on filtering models indicate that differences between normal-hearing and hearing-impaired listeners are small. (kr)

Descriptors :   *AUDITORY DEFECTS, *HEARING, *PHYSIOLOGICAL EFFECTS, *VOICE COMMUNICATIONS, DISTORTION, FILTERS, HIGH FREQUENCY, LEVEL(QUANTITY), LOW PASS FILTERS, MODELS, NOISE, PERCEPTION, REVERBERATION, SIGNAL TO NOISE RATIO, SIGNALS, SOUND, SPEECH, SPEECH RECOGNITION, SPEECH TRANSMISSION, TARGETS, THRESHOLDS(PHYSIOLOGY), WARNING SYSTEMS

Subject Categories : Human Factors Engineering & Man Machine System
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE