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A Psychoacoustic "NofM"-Type Speech Coding Strategy for Cochlear Implants

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Author(s): Nogueira Waldo | Büchner Andreas | Lenarz Thomas | Edler Bernd

Journal: EURASIP Journal on Advances in Signal Processing
ISSN 1687-6172

Volume: 2005;
Issue: 18;
Start page: 101672;
Date: 2005;
Original page

Keywords: cochlear implant | NofM | ACE | speech coding | psychoacoustic model | masking

ABSTRACT
We describe a new signal processing technique for cochlear implants using a psychoacoustic-masking model. The technique is based on the principle of a so-called "NofM" strategy. These strategies stimulate fewer channels ( ) per cycle than active electrodes (NofM; ). In "NofM" strategies such as ACE or SPEAK, only the channels with higher amplitudes are stimulated. The new strategy is based on the ACE strategy but uses a psychoacoustic-masking model in order to determine the essential components of any given audio signal. This new strategy was tested on device users in an acute study, with either 4 or 8 channels stimulated per cycle. For the first condition (4 channels), the mean improvement over the ACE strategy was . For the second condition (8 channels), no significant difference was found between the two strategies.

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