Learning spatial hearing via innate mechanisms
Fig 9
A sound S at location y is first filtered via a pair of head related transfer functions (HRTF) to give the sounds Lt and Rt received by the two ears. Within each ear, a bandpass filter bank following the equivalent rectangular bandwidths (ERB) formula is applied to generate a cochleagram Lfb and Rfb. The sound level for each frequency band is computed with the function fi. In the general scenario, a sound level could be converted into a model of the auditory nerve fiber (ANF) response magnitude via a nonlinear function , although in this paper we do not need a detailed model of the ANF response and therefore we simply use the identity function. Finally, the ANF responses are fed to the various different LSO and DNN circuits used.