A signal-actuated variable filter reduces noise by 6 to 20 dB while improving the subjective quality of telephone signals. The system consists of a combination of a fixed band-pass filter, an automatic low-pass filter, a low-level expander, and an adjustable equalizer.
Author:
Burwen, Richard S.
Affiliation:
Burwen Laboratories, Lexington, MA
AES Convention:
49 (September 1974)
Paper Number:
999
Publication Date:
September 1, 1974
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