p422fig12.19 The ARTSTREAM model includes mechanisms for deriving streams both from pitch and from source direction.  See the text for details.<BR>||  [left, right] cart Peripheral processing = [input signal-> outer & middle ear preemphasis-> basilar membrane gammatone filterbank-> energy measure].  Spectral stream layer-> spectral summation layer-> delays-> [f-, tau] plane-> pitch stream layer-> pitch summation layer.