Canta ITE’s

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


Directionality features.

Digital Dynamic Directionality

Digital Dual Microphone

Technology

Adaptive Directionality

Active Microphone Matching


Digital Dual Microphone Technology


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


Different Polar Patterns

Omnidirectional

Cardioid Supercardioid

Hybercardioid Bidirectional


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 ?


Digital Dual Microphone Technology

Time Delay-1

Front Back

+Speed of Sound = 343 m/sec.

Canta Microphone Spacing =

10 mm


Dual Microphone ITE’s

Front Back

10 mm Microphone spacing:

10 mm Microphone must be:

Horizontal.


Misaligned Microphones

30 o

0 0


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


Quiz

Impression


Answer to Quiz


Importance of Placement Key


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.


Parallel Microphone Manufacture 1

Make a marking on the investment according to marks from placement key

Transport this marks to the shell


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



+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


Telecoils &

Loop systems


Telecoil

1000 times/sec. = 1kHz

Voltmeter

1 sec. = 1 Hz.


Telecoil

Voltmeter

In a solenoid the iron core is for

collecting and rectifying the b-fields

Flux = b-fields in an area


Misaligned telecoil

B-field


Loop system

Near fieldFew cm

+ -Magnetic field (b-field)

+-


Loop system - field intensity

1 m

2 m

1 m

2 m

10 dB

5 dB

0 dB


Telecoil - measuring

CoilCoil

MagneticField Lines

Telecoil

MagneticField Lines

CoilTelecoil

Frye Interacoustic


Telecoil


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


Front / Back Microphone - 312 faceplate

Left

Right

Front

Back


Front / Back Microphone - 13 faceplate

Left

Right

Front

Back


ITE 740-D & 440-D Half-Shell

Standard• 312 battery

• Programmable Telecoil


ITE 750-D & 450-D Full-Shell

Option•13 battery (Full-Shell

only)


ITC 730 & 430

Standard• 312 battery

•Option• Size 10 battery • Programmable

Telecoil


CIC 710

Standard• Size 10 battery• Removal Cord


Canta CIC - Sizing Tool

Sizing Tool Kit

(P/N 10159700)


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

Canta ITE’s

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