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Tone Suppression and Noise Reduction It also attenuates unwanted signaling tones that may be inadvertently applied to normal monitoring channels. This tone suppression wipes out potential hearing-impairing test and interference tones in milliseconds. The DSP-8200d also provides bandpass filtering and noise reduction to reduce listener fatigue. An optional automatic gain control (AGC) adjusts the signal to a constant level. Each cardcage system includes DSP modules for 24 audio channels, two redundant power supplies, and a control module for system diagnostics, programming and monitoring. We also have a two-channel version for installation near the air traffic controller headset. The DSP-8200d now offers a Ground-to-Ground tone suppression mode that addresses the unique challenges of Ground-to-Ground circuits. It is available in our DSP-8200d Version 3.0 firmware. In this mode, we specifically notch certain frequencies that are the most common test tones while passing the signalling tones. This greatly reduces the chance of a "tone incidence" while using circuits where no solution was previously available.
Related Product Information and Operating Manuals: • Information on DSP-8200 Ground-to-Ground Mode Support  • DSP-8200d Tone Suppression System Operating Manual • DSP-8200s Tone Notching Standalone Unit Operating Manual |
The DSP-8200d Card Cage Tone Suppression and Noise Reduction System removes heterodynes (tones) caused during communications. 
All of these features can be individually using our dspterm 8200 terminal program. You connect using the RS-232 or USB port of your computer. 
New Ground-to-Ground Tone Suppression Mode