A signal-processing system has been developed that provides all the benefits of conventional rack-mounted modular systems (compact size, flexibility, easy service and upgrade). In addition, a microprocessor-controlled programming system allows all control settings to be stored and recalled. A memory allocation system assures efficient use of the nonvolatile program memory. A proposed interface standard for controlling analog modules is presented, as well as several general computer control techniques, such as multiplexed sample-and-holds, operational transconductance amplifiers (OTAs), multiplying digital-to-analog converters (DACs), and analog switching.
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