Variable-Bandwidth Masking for Automatic Audiometry The critical band, by definition, contains only those frequencies effective in masking a given tone. Yet a signal with only these frequency components is rarely used as a masking source, since its narrow band may cause it to be confused with the masked signal. Broad-band white noise (0 to 10 ... Research Article
Research Article  |   December 01, 1970
Variable-Bandwidth Masking for Automatic Audiometry
 
Author Affiliations & Notes
  • L. B. Arguimbau
    Grayson-Stadler Company, Concord, Massachusetts
Article Information
Research Articles
Research Article   |   December 01, 1970
Variable-Bandwidth Masking for Automatic Audiometry
Journal of Speech, Language, and Hearing Research, December 1970, Vol. 13, 785-788. doi:10.1044/jshr.1304.785
History: Received November 14, 1969
 
Journal of Speech, Language, and Hearing Research, December 1970, Vol. 13, 785-788. doi:10.1044/jshr.1304.785
History: Received November 14, 1969

The critical band, by definition, contains only those frequencies effective in masking a given tone. Yet a signal with only these frequency components is rarely used as a masking source, since its narrow band may cause it to be confused with the masked signal. Broad-band white noise (0 to 10 kHz), on the other hand, can be readily distinguished from the pure-tone masked signal, but contains a large amount of ineffective energy which causes needless discomfort to the patient. This makes calibration in effective masking difficult. An automatic filtering method is described which keeps the bandwidth of a masking signal equal to a constant multiple of the critical band. This filtering, in conjunction with automatic level control and heterodyning, concentrates the masking power where it can best be used, and provides a signal Jhat can be calibrated directly in effective masking.

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