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The company - dbx, Inc. - was also involved with Dynamic Noise Reduction (DNR) systems.
It was further developed into Dynamic Noise Reduction (DNR) by National Semiconductor to reduce noise levels on long-distance telephony.
With minimal changes in the external circuitry the IC could also be used to emulate a Dolby B-compatible expander as in the DNR (Dynamic Noise Reduction) system for backward compatibility.