Pitch extraction using MOS-LSI circuitry

An approach for implementing a widely used parallel processing pitch extraction algorithm is described which can be implemented with one custom MOS-LSI integrated circuit along with an inexpensive single chip microprocessor. This reduction in hardware (and therefore cost and power) over previous techniques is made possible by the careful partitioning of the computation between analog and digital circuitry which can both be integrated onto the same IC. A breadboard which simulates the MOS integrated circuit has been built and interfaced to the microprocessor. The complete system demonstrates that excellent performance can be obtained using this approach.