A Torsional Delay-Line Matched Filter for Fixed-Length Binary Codes

摘要

A Torsional delay-line matched filter for fixed-length binary codes has been designed for use as an electronic signal processor. The filter is made from a torsional magnetostrictive delay line and permanent magnets. It operates at a bit rate of 1 Mc and, when used in conjunction with a time compression loop, may be used in real time. The signal processor will operate with input signals having bandwidths of 500 kc or less. The number of values of the signal's parameter which may be processed is determined by the time compression ratio. A filter constructed with 512 bits provided a measured processing gain of greater than 25 db against band-limited Gaussian noise. The filter's code may be arbitrarily selected and may be conveniently changed. (Author)