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Binaural pressures and auditory model analysis of spatial sound reproduction
Published in Bosun Xie, Spatial Sound, 2023
A series of parallel band-pass filter banks is analogous to the frequency analysis function of the inner ear, that is, auditory filter simulation. When a band-pass filter is represented by a GammaTone filter, its impulse response is gt=AtN−1cos2πfct+φexpBtt≥0, where A is a parameter for filter gain, fc is the central frequency (Hz) of the filter, φ is the initial phase, N is the order of the filter, and B is a parameter that characterizes the filter bandwidth. When N = 4 and B = 2πERB, the GammaTone filter banks are an approximation of auditory filters. In Equation (1.3.3), the ERB of the auditory filter is given in Hertz, whereas the unit of central frequency is kilohertz. Huopaniemi et al. (1999) used 32 parallel GammaTone filters.
Optical Cochlear Implants
Published in Francesco S. Pavone, Shy Shoham, Handbook of Neurophotonics, 2020
C. P. Richter, Y. Xu, X. Tan, N. Xia, N. Suematsu
The optical cochlear implant consists of three components, an external wearable speech processor and two implantable components: the receiver and spike generator and an array comprised of the optical sources and the contacts for electrical stimulation. The hybrid approach provides the possibility of decreasing the power requirements. In other words, an opto-electrical hybrid electrode is an ideal tool for cochlear implants. The acoustical signal is recorded by a single or by multiple microphones in the speech processor. It is then filtered using a pre-emphasis filter, which is typically a high pass filter with a corner frequency at 2 Hz. The filtered signal is then decomposed into many frequency bands. Several methods can be applied, such as calculating a gammatone-weighted spectrogram or gammatonegram, or filtering the acoustic signal with a gammatone filter, which can be described by an impulse response that is the product of a gamma distribution and sinusoidal tone.
Voice activity detection for audio signal of voyage data recorder using residue network and attention mechanism
Published in Ships and Offshore Structures, 2022
Weiwei Zhang, Xin Liu, Han Du, Qiaoling Zhang, Jiaxuan Yang
To mimic human basilar membrane response, a Gammatone filter bank is utilised for GFCC calculation. The m-th impulse response of Gammatone filters in time domain is where g, , n, and are the output gain, filter bandwidth in Hz, order of filter, centre frequency in Hz and phase, respectively.