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.
fDate :
3/1/1957 12:00:00 AM
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;
Journal_Title :
Electrical Engineering
DOI :
10.1109/EE.1957.6443032
