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The DNR-1 from ETS is a DSP based noise reduction module, interface. The DNR-1 is a DSP (Digital Signal Processor) based background noise reduction unit. It is designed to digitally screen out voice from other (back ground) sounds picked up by microphones. The DNR-1 is also effective in eliminating microphone pre-amplifier noise. The DNR-1is directly compatible with ETS microphones, base stations, other "line level" audio sources and connects directly to DVRs, I/P cameras, etc.