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Canta ITE’s
Global Technical Operations
March 2001 Johnny H. Hansen, GTO
2Global Technical OperationsJanuary 2001
Contents
Directional System Microphone alignment
Dual Microphone Considerations Parallel microphone manufacture Front & Back microphone orientation
ITE / Halfshell / ITC / CIC
CIC Issues: Sizing Tool Removal Tool
3Global Technical OperationsJanuary 2001
Directionality features.
Digital Dynamic Directionality
Digital Dual Microphone
Technology
Adaptive Directionality
Active Microphone Matching
4Global Technical OperationsJanuary 2001
Digital Dual Microphone Technology
5Global Technical OperationsJanuary 2001
Polar Pattern
dB 50 40 30 20 10
0
Front
Back
30
60
90
120
150
180
210
240
300
330
0
60
120
180
50
45
28
~0
Angle Gain
6Global Technical OperationsJanuary 2001
Different Polar Patterns
Omnidirectional
Cardioid Supercardioid
Hybercardioid Bidirectional
7Global Technical OperationsJanuary 2001
Polar Patterns Considerations
The ratio of the internal electronic time delay and the
external time delay.
What determines the Polar Pattern of a Directional
System ?
8Global Technical OperationsJanuary 2001
Digital Dual Microphone Technology
Time Delay-1
Front Back
+Speed of Sound = 343 m/sec.
Canta Microphone Spacing =
10 mm
9Global Technical OperationsJanuary 2001
Dual Microphone ITE’s
Front Back
10 mm Microphone spacing:
10 mm Microphone must be:
Horizontal.
10Global Technical OperationsJanuary 2001
Misaligned Microphones
30 o
0 0
11Global Technical OperationsJanuary 2001
Effect of misaligned Microphones
10
9
0
8
7
6
5
4
3
2
1
20 40 50 60 70 80 900 3010
Actual mic. spacing
Degrees misaligned mics.
Act. mic.spacing =COS(B)
Mic. spacing
Ba
c
COS(B) =c
a
12Global Technical OperationsJanuary 2001
Quiz
Impression
13Global Technical OperationsJanuary 2001
Answer to Quiz
14Global Technical OperationsJanuary 2001
Importance of Placement Key
15Global Technical OperationsJanuary 2001
Microphone Orientation Marking
During impression taking a microphone placement key must be used in order to indicate the correct orientation of the microphones.
•Instruct the client to look straight ahead at a point at eye level. •Place the placement key at a horizontal position.
16Global Technical OperationsJanuary 2001
Parallel Microphone Manufacture 1
Make a marking on the investment according to marks from placement key
Transport this marks to the shell
17Global Technical OperationsJanuary 2001
Parallel Microphone Manufacture 2
• Place the shell on the faceplate
• Align marks on shell with guidelines on faceplate
• Scratch a line around the shell
Guidelines
Scratched line
• Erase marks on shell
• Mount shell after scratched line
18Global Technical OperationsJanuary 2001
Active Microphone Matching
19Global Technical OperationsJanuary 2001
Active Microphone Matching
+1.2 -0.5
- 1,2 dB
Coyote 1.5
+ 0.5 dB
• Danalogic use matched microphones
• Digital 5000 match once with FONIX
• Canta is matched with FONIX and keeps the matching updated all the time.
When changing microphone(s) or hybrid remember to match with
FONIX
20Global Technical OperationsJanuary 2001
Telecoils &
Loop systems
21Global Technical OperationsJanuary 2001
Telecoil
1000 times/sec. = 1kHz
Voltmeter
1 sec. = 1 Hz.
22Global Technical OperationsJanuary 2001
Telecoil
Voltmeter
In a solenoid the iron core is for
collecting and rectifying the b-fields
Flux = b-fields in an area
23Global Technical OperationsJanuary 2001
Misaligned telecoil
B-field
24Global Technical OperationsJanuary 2001
Loop system
Near fieldFew cm
+ -Magnetic field (b-field)
+-
25Global Technical OperationsJanuary 2001
Loop system - field intensity
1 m
2 m
1 m
2 m
10 dB
5 dB
0 dB
26Global Technical OperationsJanuary 2001
Telecoil - measuring
CoilCoil
MagneticField Lines
Telecoil
MagneticField Lines
CoilTelecoil
Frye Interacoustic
27Global Technical OperationsJanuary 2001
Telecoil
28Global Technical OperationsJanuary 2001
Mounting Telecoil - loop systems
• Turn on the instrument
• Listen to the instrument in Telecoil position
• Move the coil until noise from radiation is at minimum
• Observe that the coil is within scratched scratched line and in a vertical position
• Glue the coil in position
29Global Technical OperationsJanuary 2001
Front / Back Microphone - 312 faceplate
Left
Right
Front
Back
30Global Technical OperationsJanuary 2001
Front / Back Microphone - 13 faceplate
Left
Right
Front
Back
31Global Technical OperationsJanuary 2001
ITE 740-D & 440-D Half-Shell
Standard• 312 battery
• Programmable Telecoil
32Global Technical OperationsJanuary 2001
ITE 750-D & 450-D Full-Shell
Option•13 battery (Full-Shell
only)
33Global Technical OperationsJanuary 2001
ITC 730 & 430
Standard• 312 battery
•Option• Size 10 battery • Programmable
Telecoil
34Global Technical OperationsJanuary 2001
CIC 710
Standard• Size 10 battery• Removal Cord
35Global Technical OperationsJanuary 2001
Canta CIC - Sizing Tool
Sizing Tool Kit
(P/N 10159700)
36Global Technical OperationsJanuary 2001
Canta CIC - Removal Tool
Complete CIC Shell,
Faceplate and Removal Cord
CIC Module Removal Tool
Complete CIC Electronics Assembly: Receiver, Hybrid, Microphone, Contact Module and Battery Door