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Cochlear implant filterbank design and optimization : a simulation study
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Abstract:
Cochlear implants (CIs) are devices capable of restoring hearing function in profoundly-deaf patients to an acceptable degree of performance. An essential processing step in any cochlear implant is frequency analysis, which is usually performed via banks of filters. Here, we simulate and test the suitability of different filters and filterbank architectures for CIs with respect to their performance in speech intelligibility. Four different filters were implemented in an established model of CI hearing, the tone-excited vocoder, namely: GTF (Gammatone Filter), DAPGF (Differentiated All-Pole GTF), OZGF (One-Zero GTF) and BUTF (Butterworth). Three filterbank parameters, the filter order ( N), the filter quality factor ( Q) and the number of channels ( Ch), and their combinations were tested using objective and subjective metrics. Simulation results show that all filters tested are suitable for CI implementation, but that the choice of Q and N parameter values is crucial. For most conditions, optimal ( N,Q) combinations were within few units away from the combination (2, 4). ; 7 page(s)
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Keyword:
Cochlear implants; Filter transfer functions; Speech; Vocoders
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URL: http://hdl.handle.net/1959.14/1029957
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Towards objective measures of speech intelligibility for Cochlear Implant users in reverberant environments
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Objective Measurement of the Speech Transmission Quality of Vocoders by Means of the Speech Transmission Index
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In: DTIC (2005)
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Speech Analysis and Synthesis Based on Pitch-Synchronous Segmentation of the Speech Waveform.
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In: DTIC AND NTIS (1994)
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The Intelligibility of Natural and LPC-Vocoded Words and Sentences Presented to Native and Non-Native Speakers of English
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In: DTIC AND NTIS (1990)
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Vocabulary Synthesis Based on Line Spectrum Pairs
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In: DTIC AND NTIS (1989)
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The Intelligibility of Natural and Vocoded Semantically Anomalous Sentences: A Comparative Analysis of English Monolinguals and German-English Bilinguals.
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In: DTIC AND NTIS (1987)
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Hopfield Model Applied to Vowel and Consonant Discrimination
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In: DTIC AND NTIS (1986)
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The Intelligibility of Non-Vocoded and Vocoded Semantically Anomalous Sentences.
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In: DTIC AND NTIS (1985)
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A Comparative Analysis of Whispered and Normally Phonated Speech Using an LPC-10 Vocoder
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In: DTIC AND NTIS (1985)
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Intelligibility Performance of the LPC-10 and APC/SQ Speech Algorithms in a Fading Environment.
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In: DTIC AND NTIS (1985)
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Automatic Speaker Recognition over Military Communication Systems. A Feasibility Evaluation.
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In: DTIC AND NTIS (1985)
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Subjective and Objective Evaluation of Pitch Extractors for LPC and Harmonic Deviations Vocoders.
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In: DTIC AND NTIS (1984)
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A Recursive Linear Predictive Vocoder.
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In: DTIC AND NTIS (1983)
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Vector/Matrix Quantization for Narrow-Bandwidth Digital Speech Compression.
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In: DTIC AND NTIS (1982)
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Research on Narrowband Communications.
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In: DTIC AND NTIS (1982)
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Research on Narrowband Communications
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In: DTIC AND NTIS (1981)
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Research on Narrowband Communications
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In: DTIC AND NTIS (1981)
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Research on Narrowband Communications
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In: DTIC AND NTIS (1981)
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Research on Narrowband Communications
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In: DTIC AND NTIS (1981)
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