A first step in this project was to design and build a prototype frontend filterbank and signal-processing system using board-level components. By using non-volatile, programmable analog and digital processors all over the board, we have a system which is flexible enough to implement numerous styles of filterbank processing, emulating the biological cochlea as well as some aspects of the auditory pathway up to the auditory nerve, but can be interfaced directly to a computer for post-processing of the data. The system input can be received either directly from a microphone or by download from a computer.
The application note (user manual) for the biosonar frontend signal processor board is complete and can be downloaded from the following link:
User Manual (PDF)The next stage of the project (2001-2003) is to miniaturize the frontend processing into a single integrated circuit, and to couple it with a classification system (also a hybrid analog-digital VLSI chip) implementing a support-vector machine (SVM).
User Manual (PostScript)
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Last updated: October 11, 2005 at 11:42pm