TAKANEN2013_ONSETENHANCEMENT
Emphasize the onsets on direction analysis

Usage:

[thetaOut energyOut]=takanen2013_onsetenhancement(thetaIn,energyIn,fs);

Input parameters:

`thetaIn`	the "where" cue of the given hemisphere
`energyIn`	the ventral "what" stream output of the periphery model
`fs`	sampling rate
`cfs`	characterstic frequencies of the model

Output parameters:

`thetaOut`	the resulting "where" cue applied in forming of the binaural activity map
`energyOut`	the resulting "what" cue applied in forming of the binaural activity map

Description:

This method aims to account for the emphasized role of onsets in localization by the auditory system, and for the variation found in the time resolution of the localization. The steps involved in this method are listed below and a more detailed describtion about the method can be found in in Takanen, Santala, Pulkki 2013 (Sec. 3.2.7)

analyze the cues with two mechanisms
- 50-ms long time window to evaluate the average information over a longer time frame
- 3-ms long time frame to analyze the gradients of the cues in order to be sensitive to the onsets
combine the informations obtained with the two mechanisms to
- obtain the overall "where" and "what" cues
- emphasize the information obtained with the mechanism employing shorter time frame to give more weight to the onsets

References:

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 ]