NRU-600 DSP Noise Reduction Unit

The NRU-600 is an advanced audio signal processor that provides maximum flexibility to eliminate or reduce most types of interference from voice, CW and data transmissions. The unit uses a high speed Digital Signal Processor (DSP) to provide simultaneous bandpass filtering, noise reduction and multiple tone/heterodyne removal. An automatic Notch filter removes multiple heterodynes from tune-ups, adjacent channel carriers, CW, RTTY, or similar signals without interfering with voice signals when a voice bandwidth has been selected. The notch filter operates in 5 milliseconds or less. Two noise reduction algorithms are provided in the NRU-600: an FD (Frequency Domain) algorithm and a TD (Time Domain) algorithm; to give the operator the best audio noise reduction possible.