noise suppressionn. the suppression of noise, esp. in order to improve the quality of audio signals by selectively reducing noise in one or more frequency bands.
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1933 Pract. Wireless2 37/2 (heading) Noise suppression on the short waves.
1991 Motorboat & Yachting June 99/3 The advantages are light weight, no corrosion, and good noise suppression—all at a price far less than that of stainless steel.