TAKANEN2013_PERIPHERY
Process the input through the model of periphery

Usage:

periphOutput = takanen2013_periphery(insig,fs,outputPlot);
periphOutput = takanen2013_periphery(insig,fs);

Input parameters:

`insig`	binaural input signal to be processed. Optionally, the output of the cochlear model by Verhulst et. al. 2012 can be used as well
`fs`	sampling rate
`outputPlot`	boolean value that defines whether the periphery model output at different frequency bands are plotted

Output parameters:

periphOutput

Structure consisting of the following elements

periphOutput.left Left ear "where" stream output

periphOutput.right Right ear "where" stream output

periphOutput.fc Characteristic frequencies

periphOutput.ventralLeft Left hemisphere "what" stream output

periphOutput.ventralLeft Right hemisphere "what" stream output

Description:

This function processes the binaural input signal through the model of periphery presented by Takanen, Santala, Pulkki 2013, the model which consists of a nonlinear time-domain model of cochlea and model of cochlear nucleus. The processing contains the following steps:

the binaural input signal is processed with the nonlinear time- domain model of cochlea by Verhulst et. al. 2013 to obtain the velocity of basilar membrane movement at different positions
the obtained velocity information is half-wave rectified
the half-waves are replaced with Gaussian pulses centered around the local maxima of the half-waves
the frequency-dependent delays of the cochlea model are compensated

References:

V. Pulkki and T. Hirvonen. Functional count-comparison model for binaural decoding. Acta Acustica united with Acustica, 95(5):883 -- 900, Sept./Oct. 2009.

M. Takanen, O. Santala, and V. Pulkki. Visualization of functional count-comparison-based binaural auditory model output. Hearing research, 309:147--163, 2014. PMID: 24513586. [ DOI ]

S. Verhulst, T. Dau, and C. A. Shera. Nonlinear time-domain cochlear model for transient stimulation and human otoacoustic emission. The Journal of the Acoustical Society of America, 132(6):3842 -- 3848, 2012.