DocumentCode
1486947
Title
The bell system speakerphone
Author
Clemency, W. F. ; Romanow, F. F. ; Rose, A. F.
Author_Institution
American Telephone & Telegraph Co., New York, N.Y.
Volume
76
Issue
3
fYear
1957
fDate
3/1/1957 12:00:00 AM
Firstpage
189
Lastpage
194
Abstract
Bell System Speakerphone provides hands free telephony. Messages are received over a loudspeaker and transmitted over a microphone located a convenient distance away. Design techniques and components of the Speakerphone are described. Customer satisfaction is indicated.
Keywords
Acoustics; Coils; Couplings; Impedance; Loudspeakers; Microphones; Speech;
fLanguage
English
Journal_Title
Electrical Engineering
Publisher
ieee
ISSN
0095-9197
Type
jour
DOI
10.1109/EE.1957.6443032
Filename
6443032
Link To Document