DocumentCode
1078156
Title
An interphone system for "hands-free" operation in high ambient noise
Author
Torick, E.L. ; Allen, R.G.
Author_Institution
CBS Laboratories, Stamford, Conn.
Volume
14
Issue
4
fYear
1966
fDate
12/1/1966 12:00:00 AM
Firstpage
168
Lastpage
173
Abstract
A new interphone system has been developed providing a high degree of intelligibility and listener comfort in ambient levels up to 125 dB sound-pressure level. This paper discusses some of the novel electronic features employed, including 1) Automatic Gain Control (AGC) with recovery inhibition to prevent noise "pumping" during speech pauses, 2) Automatic Level Compensation (ALC) for automatic adjustment of listening level with changing ambient, and 3) highly reliable voice-actuated switching (VOX) at widely varying ambient levels.
Keywords
Acoustic noise; Circuit noise; Frequency; Microphones; Noise cancellation; Noise level; Speech analysis; Speech enhancement; Switching circuits; Vehicles;
fLanguage
English
Journal_Title
Audio and Electroacoustics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9278
Type
jour
DOI
10.1109/TAU.1966.1161872
Filename
1161872
Link To Document