SeeHear System: A New Implementation

Abstract

A SeeHear system, based on a custom analog VLSI chip, has been designed, simulated, fabricated and experimentally tested. The design considerations are concentrated on the implementation of the analog delay lines, which are the key building blocks for implementing the binaural-headshadow and pinna-trague models of the SeeHear system. Allpass filter circuits, instead of follower-integrator (lowpass filter) circuits, are employed to implement the delay line, giving a wider bandwidth and ideal analog signal delay within the audio band. The chip, with 11×15 pixels, was fabricated by NORCHIP using a standard 1.2¿m N-well CMOS process.