E. BAUM DIGITAL MICROPHONE

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP81-00120R000100060049-8
• Release Decision: RIFPUB
• Original Classification: K
• Document Page Count: 5
• Document Creation Date: December 20, 2016
• Document Release Date: November 6, 2002
• Sequence Number: 49
• Publication Date: November 15, 1966
• Content Type: CONT

Approved For Release 2007/09/21: CIA-RDP81-0012OR000100060049-8
Nov. 15, 1966
Filed June 3. 1963
3286,032
SOONO
WAVES
R EFL ECT/NG 1
Me R.20R
o_5 viccs
A Q.4A /N
COO E l9ATRIN
a
r +
SOUND
WAVE
I st3/APHRAG11
J
SAMA4 /NG
S/GNAL
MAGNET
G//fE BEA11 CODE
t~LECT,~OIV~
B EAM
GUN
ZIGRY,
4FAM
A"OrION
ninauG~ r w+t s
6F 6?7F
yZ
SOUK
WA VE
SAM.nZING
.S'/GNA E
Approved For Release 2007/09/21: CIA-RDP81-0012OR000100060049-8
 Approved For Release 2007/09/21: CIA-RDP81-0012OR000100060049-8
Lvov. 15, 1966 E. BAUM 3,286,032
DIGITAL MICROPHONE
Filed June 3, 1963
DIAPHRAGM 1
COLD/ft7A7'QR /$
/7
POCARIzER 19
-SOC/NO
WAVES
SOUND
WA VES
SAMPt /,VG
SIGNAL,
P110TO
S ENS/,7-/ VE
COOS
MATR/X
P.4ESS41RE L..,_,
SENS/T/ VE
POGAR/ZING
DFV/CE GAO
SA MPC /"a
S/GNAL
INVENTOR.
cLMER QAUF
0
Approved For Release 2007/09/21: CIA-RDP81-0012OR000100060049-8
 Approved For Release 2007/09/21 : CIA-RDP81-0012OR000100060049-8 15, 1966
1 2
3.286.032
DIGITAL MICROPHONE
Elsner Sauna., River Ed_e, \,J., ass;,--nor to International
Telephone and Telec,-27.b Corporation, Nutley, NJ, a
corporation of Mars land
Filed June 3. 1463, Ser. No. 284.954
11 Claims. (CL 179-1)
the brushes to scan conductive elements arranged in a
code matrix to generate the digital code ot'tpct. (5) A
capacitor plate coup:, d to the diaphragm with the capaci-
tor plate being moved to scan a second capacitor plate
in the form of a :o,;e matrix to generate the digital code
output. (I.) :gneti: field sensitive devices arranged
to be responsive to the intensity of the magnetic field
varying in response to:hc motion of the diaphragm to
This invention relates to microphones and more par- pc-crate the digital code output.
ticularly to a microphone capable of providing directly a 10 1. further feature of this invention is the provision of
dig tal :,ode output a code matrix in a form c:her than a straight binary code,
In order to transmit sand wave-, such as voice, by for instance delta inverted binary, excess-3
digital codes, such as PCNI (pulse code modulation), it binary code, and so fo-h, to provide a digital output in
is necessary to transform the voice or sound wave into a accordance with the given selected code.
pulse coded signal. This is normally done by using an 13 The above-mentioned and other features and objects of
analog type transducer, such as the normal microphone,. this invention trill be:c:x more apparent by reference to
to translate the sound nave into an electrical output, s:im- the following d:ser;ptie t taken in conjunction with the
pie the electrical signal o..t; ut at .regular intervals, and ac:ompan}ingdrawirg-e.inwhich:
generate a digital cock ("_?ed on the ca.rnp'