Implementation of a multi-channel biomagnetic measurement system using DSP technology

Reports on the functions, architecture, and performance of the digital signal processing components of a biomagnetometer system including over 100 total channels. The functions of the system include sensor linearization via feedback, sample rate conversion filtering, noise cancellation, variable cutoff low and high pass filtering, and notch or comb filtering for power line harmonics. The flexible, high performance system architecture is based on commercial DSP chips and a mixture of serial and parallel data communications paths. The overall performance of the first production system is summarized. >