Suggested Threshold Sound Pressure Levels For Frequency Modulated (Warble) Tones in the Sound Field The problems inherent in using frequency-specific stimuli in the sound field to determine threshold sensitivity are reviewed, including a discussion of some of the specific problems encountered when introducing pure tones, narrow bands of noise, and frequency-modulated (FM) tones. The results of two experiments are reported. In Experiment I, the ... Articles
Articles  |   February 01, 1979
Suggested Threshold Sound Pressure Levels For Frequency Modulated (Warble) Tones in the Sound Field
 
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Article Information
Articles   |   February 01, 1979
Suggested Threshold Sound Pressure Levels For Frequency Modulated (Warble) Tones in the Sound Field
Journal of Speech and Hearing Disorders, February 1979, Vol. 44, 37-54. doi:10.1044/jshd.4401.37
History: Received June 1, 1978 , Accepted October 31, 1978
 
Journal of Speech and Hearing Disorders, February 1979, Vol. 44, 37-54. doi:10.1044/jshd.4401.37
History: Received June 1, 1978; Accepted October 31, 1978

The problems inherent in using frequency-specific stimuli in the sound field to determine threshold sensitivity are reviewed, including a discussion of some of the specific problems encountered when introducing pure tones, narrow bands of noise, and frequency-modulated (FM) tones. The results of two experiments are reported. In Experiment I, the relationship between pure tones and frequency-modulated tones is developed under earphones in an anechoic chamber, and in two sound-isolated auditory test rooms (not anechoic). Experiment I resulted in the development of a reference threshold sound pressure level for frequency-modulated signals in the sound field. In Experiment II the reference level was applied to a clinical test facility and evaluated with a group of hearing-impaired individuals. The results suggest that the sound-field reference levels accurately reflect monaural threshold under earphones, when the earphone is calibrated to the ANSI, 1969 standard, and the sound field is calibrated to the suggested standard.

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