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ECE2025_CochlearBackgroundLecture

ECE2025_CochlearBackgroundLecture - The Coding of Sound by...

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±²³³²´µ ³ The Coding of Sound by a Cochlear Prosthesis ECE 2025 Background Lecture ³ Voiced Speech Signal Voiced speech is periodic Unvoiced signals are non-periodic and much noisier
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±²³³²´µ ± Propagation of Sound Longitudinal pressure waves Transmitted through a medium equally in all direction Propagated by molecular interactions in the medium Rarefactions: low pressure regions, particles are pulled apart Compressions: high pressure regions, particles pushed together · Propagation of Sound Rarefactions (R): low pressure regions, particles are pulled apart Compressions (C): high pressure regions, particles pushed together R R R R C C C
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±²³³²´µ ± Characteristics of a Sound Wave Amplitude Corresponds to loudness Measured in decibels (dB) Frequency Corresponds to pitch Middle C is 261.626Hz Amplitude 1/frequency · Measure of Loudness Ratio Ratio of sound pressure level X(t) relative to a standard level X 0 – X 0 is typically very soft, just on the threshold of hearing Rather than using an instantaneous measure, an average measure over some small interval of time is used Since humans can only hear sound separated by 10Bels, we use a Decibel scale to measure sound Bels = log X 2 X 0 2 Decibels = 10 log X 2 X 0 2
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±²³³²´µ · The Peripheral Auditory System Outer Ear Middle Ear Inner Ear Auditory nerve Cochlea ¸ COCHLEA The Organ of Corti mechanical-to- electrical transducer Hair cells
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±²³³²´! ! Frequency To Place Mapping: Tonotopic arrangement of the Basilar membrane ³´ The Cochlea as a Frequency Analyzer The cochlea serves to separate the frequencies
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