Digital Hearing AidsArthur Schaub Thieme, 1 янв. 2011 г. - Всего страниц: 188 Digital Hearing Aids is an essential reference for information about the latest innovations in digital hearing aid technology. Concise descriptions and easy-to-reference tables and diagrams enable the reader to rapidly gain a solid understanding of digital signal processing, including such important topics as adaptive acoustic directionality, adaptive noise reduction, adaptive feedback cancellation, and sound classification. The book is divided into three main sections, with the first section providing an overview of foundational concepts, the second section presenting detailed analysis of state-of-the-art processing techniques, and the third section describing specific technical aspects of digital processing. Highlights: |
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80 dB SPL a₁ acoustic signal amplifies amplitude attenuation Audiology autocorrelation autocorrelation coefficient band signals block diagram calculate cardioid Chapter compression characteristic constant controllable filter delay difference signal digital hearing aids digital signal processing directional microphone directional pattern Drag the formula dynamic range compression ear canal example Excel table factor feedback cancellation Figure filter coefficients finite impulse response FIR filter Fourier transform frequency bands Frequency Hz gain curves Gain dB hearing instrument hearing loss high-pass filter input levels input sample input signal Level dB SPL level measurement low-pass filter measurement value ment microphone signal modulation NAL-NL1 normalized prediction error observation window output signal y(t period phonemes pressure Sound pressure processing scheme quency rear microphone resonance filter sample values shows signal components signal segment signal x[n sound pressure level Sound pressure Sound spectral spectrum squared test signal tion transfer function waveform WDRC system wide dynamic range