Abstract

Psychophysical tests with implanted subjects indicate that responses to short duration electrical stimuli (similar in duration to transitional segments in speech) exhibit very narrow dynamic ranges, on the order of 6–10 dB; whereas responses to longer duration stimuli can exhibit considerably larger dynamic ranges, on the order of 17–40 dB. A specialized form of compression that compensates for this variation of the subject's dynamic range may be useful. A very significant amount of compression is essential because of the narrow dynamic range elicited by electrical stimuli in these subjects. We have investigated a set of “split‐spectrum,” multi‐channel speech processor configurations. These speech processors have been designed to compress the wide dynamic range of the acoustic environment into the very narrow dynamic range of the implant recipient. A set of compression systems have been compared to determine which strategies offer the most effective control of stimulus amplitude. [Work supported by NIH and Hearing Research, Inc.]

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