TAILIEUCHUNG - Báo cáo hóa học: " A Psychoacoustic “NofM”-Type Speech Coding Strategy for Cochlear Implants"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A Psychoacoustic “NofM”-Type Speech Coding Strategy for Cochlear Implants | EURASIP Journal on Applied Signal Processing 2005 18 3044-3059 2005 Waldo Nogueira et al. A Psychoacoustic NofM -Type Speech Coding Strategy for Cochlear Implants Waldo Nogueira Laboratorium fur Informationstechnologie Universitiit Hannover Schneiderberg 32 30167 Hannover Germany Email nogueira@ Andreas Buchner Department of Otolaryngology Medical University Hanover Carl-Neuberg-Strasse 1 30625 Hannover Germany Email buechner@ Thomas Lenarz Department of Otolaryngology Medical University Hanover Carl-Neuberg-Strasse 1 30625 Hannover Germany Email lenarz@ Bernd Edler Laboratorium fur Informationstechnologie Universitiit Hannover Schneiderberg 32 30167 Hannover Germany Email edler@ Received 1 June 2004 Revised 10 March 2005 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 N per cycle than active electrodes NofM N M . In NofM strategies such as ACE or SPEAK only the N 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 17 . For the second condition 8 channels no significant difference was found between the two strategies. Keywords and phrases cochlear implant NofM ACE speech coding psychoacoustic model masking. 1. INTRODUCTION Cochlear implants are widely accepted as the most effective means of improving the auditory receptive abilities of people with profound hearing loss. Generally these devices consist of a microphone a speech processor a transmitter a receiver and an electrode

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