Rocktron PC Preamp GIS - Manual (Page 14)

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The SSM2000 is an advanced audio noise reduction system based
on patented HUSH ® technology. The SSM2000 is commercially available
from Analog Devices, produced under the license of the HUSH patents.
HUSH ® combines a dynamic filter and downward expander to provide a
high level effectiveness without the sonic artifacts normally associated
with noise reduction systems. In addition, an Adaptive Threshold circuit
detects nominal signal levels and dynamically adjusts both thresholds,
thereby providing optimal results regardless of program source. Since it
is a single-ended system, HUSH can be used on virtually any audio
source, including audio and video tapes, radio and television broad-
casts, or any other source with objectionable noise. The SSM2000 can
also be used with Dolby ® encoded sources with excellent results.
FEATURES:
• Up to 25dB of noise reduction from virtually any audio
source without sonic artifacts
• External port available for additional attenuation—
providing in excess of 85dB of noise reduction
• "Single-ended" operation eliminates need for encode-
decode process
• Adaptive threshold dynamically adjusts to changing
nominal signal levels
• Effectively decodes Dolby ® encoded sources
• Direct VCA control port access for additional level control
functionality
• Logic-controllable bypass and muting
• Flexible on-chip voltage reference
• 100dB dynamic range (noise reduction OFF)
• 0.02% typical THD+N (@ 1kHz, noise reduction OFF)
• +7V to +20V operation
• No royalty requirements
About the Analog Devices SSM2000...