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

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