Second order numeric filter for signal processing - uses clock source with three clocks controlling synchronised and interlaced multipliers

摘要

A signal processing system is used for analogue data varying as a function of time. The process is based on a second order numeric filter providing two magnitudes of time varying outputs in a low and pass band. The filter has a variable cut and fall-off frequency. The analogue input amplitude is converted to numeric form and processed as parallel streams of data, each such stream carrying identification bits and attenuation information. Data streams are fed from the input analogue to digital converter to a frequency multiplier. A clock source provides a parallel predetermined frequency pulse stream as three parallel outputs feeding three separate interlaced multipliers.