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KMID : 1137820100310060417
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의공학회지
2010 Volume.31 No. 6 p.417 ~ p.426
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Improved Melody Recognition Performance of a Cochlear Implant Speech Processing Strategy Using Instantaneous Frequency Encoding Based on Teager Energy Operator
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Choi Sung-Jin
Ryu Sang-Baek
Kim Kyung-Hwan
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Abstract
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We present a speech processing strategy incorporating instantaneous frequency (IF) encoding for the enhancement of melody recognition performance of cochlear implants. For the IF extraction from incoming sound, we propose the use of a Teager energy operator (TEO), which is advantageous for its lower computational load. From time-frequency analysis, we verified that the TEO-based method provides proper IF encoding of input sound, which is crucial for melody recognition. Similar benefit could be obtained also from the use of a Hilbert transform (HT), but much higher computational cost was required. The melody recognition performance of the proposed speech processing strategy was compared with those of a conventional strategy using envelope extraction, and the HT-based IF encoding. Hearing tests on normal subjects were performed using acoustic simulation and a musical contour identification task. Insignificant difference in melody recognition performance was observed between the TEO-based and HT-based IF encodings, and both were superior to the conventional strategy. However, the TEO-based strategy was advantageous considering that it was approximately 35% faster than the HT-based strategy.
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KEYWORD
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Cochlear implant, speech processing, strategy melody recognition, instantaneous frequency, Teager energy operator
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