Processing the Telephone Speech Signal for the Hearing Impaired
作者:
Mark Terry,
Kathryn Bright,
Mike Durian,
Laura Kepler,
Richard Sweetman,
Michael Grim,
期刊:
Ear and Hearing
(OVID Available online 1992)
卷期:
Volume 13,
issue 2
页码: 70-79
ISSN:0196-0202
年代: 1992
出版商: OVID
数据来源: OVID
摘要:
ABSTRACTSpeech intelligibility scores from 16 subjects with senso-rineural hearing loss were evaluated using a digitized version of the California Consonant Test that was presented via headphones through a 300 to 3000 Hz bandpass filter to simulate the telephone band. Each subject was tested with an unprocessed signal that was frequency-equalized to compensate for the individual's hearing loss, and a signal that was equalized and compressed by the use of a compressor compression technique. Subjects were tested at three sound pressure levels above a pure-tone average threshold for frequencies 1 and 2 kHz. Two digital signal processing techniques designed to compensate for high-frequency hearing loss were examined: frequency domain processing and time domain processing. Frequency domain involved modification of the short-term spectrum obtained through a fast Fourier transform, whereas time domain processing involved passing the signal through a bank of finite impulse response filters. Both techniques showed significant intelligibility improvements (15-3070). In a second experiment, 16 additional subjects with high-frequency hearing loss compared an amplified telephone signal to three processed signals: (1) 6 dB per octave emphasis; (2) a signal frequency equalized for their hearing loss; and (3) a signal that was equalized for their hearing loss and was compressed according to their uncomfortable loudness levels. Most subjects preferred the signal with the 6 dB per octave emphasis.
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