Linear Technology LINEARCOM3000 LC3.IRTX User manual

Linear Technologie • 11 rue du Puits Rochefort • 42 100 Saint-Etienne

Tél: +33 (0)4 77 81 49 49 • Fax: +33 (0)4 77 81 49 40 • www.lineartech.fr V.2017

DIGITAL INFRARED CONTROLLER LC3.IRTX

Operation manual

TABLE OF CONTENTS

1. Safety operation

2. System introduction

3. Digital infrared radiator

Page 3

Page 4

Page 9

1. SAFETY OPERATION

Firstly, thank you very much for using LINEARCOM3000 conference system. To make sure

safety of equipment and user, please read this safety instruction carefully before installing

and using and operate seriously according to this manual. Also please keep this safety

instruction for future reference. Notices are as below :

1. Wiring during installation must follow national electric safety standards, national reproong

regulations and all related local regulations.

2. Protect the power cord from being walked on and do not stack things on the power cord,

particularly at plugs.

3. To make sure earth wire connecting well. Do not use 2 - pin plugs. Power supply : 220V

50 Hz.

4. Power supply cords :

- America, Japan : AC 110V ~ 120V 60 Hz

- Asia, Europe : AC 220V ~ 240V 50 Hz

5. The packaging of equipment is designed for protecting 1.5 meters dropping but please

prevent from stress and shocking during transportation, installation and storing.

6. Do not place the system equipments on too cold or too hot room.

7. Keep good ventilation to protect the machine.

8. Unplug the system during wet weather or when unused for long periods of time.

9. Must unplug the equipment before below operations :

- Taking down or resetting any part on machine

- Reconnecting any plug in system

10. Do not disassemble or maintain the product by non-authorized personnel to avoid

accident or damage. Warning label is as below :

11. Prevent from any chemicals or liquid.

12. Please check all the connections completely before turning on. Check the set-up of main

unit before usage.

13. If you nd top warning label on product, it means : Do not open the machine cover to

avoid electric shock. Also please do not place the useless part in the case. Any trouble,

please contact with the authorized personnel.

CAUTION

RISK OF ELECTRIC

SHOCK

DO NOT OPEN

This symbol is intended to alert the user of the presence of insulated

dangerous voltage within the product’s enclosure that may present

a risk of electric shock

This symbol is intended to alert the user of important operating and

maintenance (servicing) instructions in the literature provided with

the equipment

Brief introduction

LINEARCOM3000 is a series product of digital infrared language distribution system. It uses

both digital infrared audio transmitting and control technique and an IR digital infrared chip.

They own LINEARCOM3000’s intellectual property. IRRC08 can be used in simultaneous

interpretation systems for multi-language conferences.

In simultaneous interpretation systems, the interpreter translates the speaker’s speech, the

translated audio transmits through the conference venue by modulated infrared radiation

and the delegates listen to wanted language by infrared receiver via earphone.

The system can also be used for other audio signal distribution occasions, such as urgent

mode, free mode audio signal output.

This system is compliant to IEC 61603-7 (international standard of digital infrared transmission)

and IEC60914 (conference systems-electrical and audio requirements, same as domestic

standard GB/T 15381-94), moreover, it is compatible with other IR systems, compliant to

IEC 61603-7. Parts of IEC 61603 are used in this manual for a better understanding of both

theory and technique of the system.

2. SYSTEM INTRODUCTION

System composition

The system consists of a number (N) of audio sources, either analogue or digital, which are

connected to a transmitter. The transmitter processes the audio signals into an electrical

output to feed the infrared radiator. The infrared signal is received by the infrared receiver

that processes the signal and outputs an audio signal and/or associated data.

System radiation signal

IRR25 uses high frequency carrier signals (typically 2~8 MHz) to prevent interference by

modern light sources. Fully digital audio processing guarantees a constant high audio quality.

The signal processing in the main unit consists of the following main steps :

1. Code : Each analogue audio channel is converted to a digital signal; the digital signals are

compressed to increase the amount of information that can be distributed on each carrier

(compression ratio is related to required audio quality); groups of up to 4 digital signals are

combined into a digital information steam. Extra fault algorithm information is added. This

information is used by the receivers for fault detection and correction.

2. Modulation : A high frequency carrier signal is phase-modulated with the digital information

stream by digital wireless base station digital modulation technique.

3. Filter

4. Magnify

5. Radiation : Up to 8 modulated carrier signals are combined and sent to the IR radiators,

which convert the carrier signals to modulated infrared light.

In the IR receivers, a reverse processing is used to convert the modulated infrared light to

separate digital audio channels.

Carriers

System is transmitting within the 2 ~ 8 MHz frequency band. It can transmit up to 8 di󰀨erent

carrier signals (depending on the transmitter type) Carriers 0 to 5 are according to IEC

61603-7.

Aspects of infrared distribution

A good digital infrared language distribution system ensures that all delegates in a conference

venue receive the distributed signals without disturbance. This is achieved by using enough

and well positioned radiators, so that uniform IR signal with adequate strength can be

received at any place of the conference venue.

When planning an infrared distribution system several aspects inuencing the uniformity and

quality of the infrared signal should be considered. These are discussed in the next sections.

Ambient lighting

IRRC08 can be operated without any problem even if uorescent lamps (with or without

electronic ballast or dimming facility) such as TL lamps or energy saving lamps are switched

on.

For venues with large, unscreened windows, more radiators should be added. For outdoor

use, a site test will be required to determine the required amount of radiators. With su󰀩cient

radiators, the receivers will work well, even in bright sunlight.

Objects, surfaces and reections

Just like visible light, infrared radiation is reected from hard surfaces and refracted by

hyaloid (glassy or transparent appearance) objects. Both objects in the conference venue

and structure of the walls and ceilings will inuence the distribution of infrared light.

Infrared radiation is reected from almost all hard surfaces. Smooth, bright or shiny surfaces

reect well. Dark or rough surfaces absorb a large part of the infrared energy. Normally

surfaces opaque to visible light are also opaque to infrared radiation. Shadows from walls

and furniture will inuence the transmission of infrared light. This can be solved by using a

su󰀩cient quantity of radiators. They should be positioned in a manner to provide an infrared

eld strong enough to cover the whole conference area. Take care not to direct radiators

towards uncovered windows, or most of this radiation will be lost.

The direction and sensitivity of receiver unit

The sensitivity of a receiver is at its best when it is aimed directly towards a radiator. To

minimize the disadvantage of this aspect, IRRC08 receiver adopts an ingenious structural

design with peculiar 270° ultra wide angle to get perfect IR capture and sound quality at any

disposition.

The coverage area of radiator

The number of transmitted carriers and the output power of the radiator determine the

coverage area of a radiator. The total radiation energy of a radiator is distributed over

transmitted carriers. The coverage area becomes proportionally smaller if more carriers are

used. The receiver requires a strength of the IR signal of 4 mW / m2 per carrier to work well

(resulting in an 80 dB S/N ratio for uninterrupted audio channels)

The cross section of the 3 dimensional radiation with the reception level of participants is

the footprint (the dark grey area in gure 2.9 to gure 2.10) In this area, the direct signal is

strong enough to ensure proper reception when the receiver is directed towards the radiator.

The size and position of the footprint depends on the mounting height and the angle of the

radiator.

Area contrast of di󰀨erent installation height Area contrast between 15º and 45º to the ceiling

Positioning the radiators

Because infrared radiation can reach a receiver directly and / or via di󰀨used reections, it’s

important to take this into consideration when installing the radiators. For best reception

quality, receivers should pick up direct infrared radiation. In addition reections will improve

the signal reception. In big conference halls, infrared signal will be blocked by the people in

front of the receiver. For that reason the radiator should be installed at an appropriate height,

usually not below 2.5 meters.

For concentrically arranged conference venues, radiators located high up and faced to the

center from every angle can cover the area very e󰀩ciently. If the direction of the receiver

changes, e.g. changing seat direction, the radiators can be installed in the corners of the

room.

In the case the seating is always directed towards the IR emitting source, there are no

radiators needed at the back.

If the path of the infrared signals is blocked, e.g. under balconies, at least one additional

radiator is needed to cover the ‘shaded’ area.

Overlapped footprints and multi-path e󰀨ect

If footprints of two radiators overlap, the total coverage area maybe larger than the sum of

the two separate footprints. In an area with overlap e󰀨ect, the individual radiation signals of

two radiators are added, resulting in an increase of the radiation intensity, larger than the

required intensity.

However, due to the di󰀨erences in the delays of the signals from two or more radiators,

the signals may cancel out each other (multi-path e󰀨ect). In a worst-case situation, loss of

reception at some positions (black spots) may be the consequence.

Increased coverage area caused by added

radiation power

Reduced coverage area caused by

di󰀨erences in cable signal delay

The lower the carrier frequency, the less susceptible the receiver is for di󰀨erences in signal

delays.

The signal delays can be compensated by adjusting the delay compensation switches on

the radiators.

Infrared controller is the heart of the system. Up to 32 unbalanced audio signals can be

accepted (under combination mode) It can either be connected to interpretation controller

or through conference system controller and other discussion and interpretation systems or

be used as a stand-alone system for distributing external audio signals. IRTX is suitable for

either tabletop or 19 inch rack mounting using. Four feet (for tabletop) and two brackets (for

rack mounting) are supplied.

Function and feature

• Adopt full digital conference technology, compliant to IEC61603-7 and IEC 60914

international standard.

• 2.8 inch LCD and panel navigation keyboard, could setup menu.

• Adopt 2-8 MHz, infrared receiver will not be disturbed by high frequency driving light

source.

• Compatible with the infrared simultaneous interpretation system which is compliant to

IEC61603-7.

• 4CH, 8CH, 16CH, 32CH audio channels.

• Could adjust the sensitivity of each audio input.

• 6 channels high frequency output connectors (BNC), which is used to connect infrared

radiator.

• New digital lock function, totally stop outside disturbing and wiretapping.

3. DIGITAL INFRARED CONTROLLER

• Many work modes, suitable for di󰀨erent situation.

• Conference mode : Receivers could receive independence channel signal 2U.

• Emergency mode : All receivers could receive exterior alarm signal.

• Free mode : All receivers could receive exterior music signal.

• 2U international standard design could be put in 19 inch rack cabinet.

• Dimension : 432 x 350 x 90 mm.

• Color : Dark, grey.

• Weight : 8 kg.

Technical parameter of digital infrared receiver

Channel 32 CH

Modulation mode Digital wireless base station

Carrier frequency 2-8 MHz

Frequency respond 30-20000 Hz

Distortion <0.2%

SNR >90 dB

Working voltage AC 110 / 220V

Input level 2V p-p

Output impedance 75 Ohm

Emergency audio input RCA socket x2

Free audio input RCA socket x2

Digital signal output BNC socket x6

LCD display 2.8 inch display

Dimension 432 x 90 x 350 mm

Weight 8 kg

Color Black, grey

Installation 19 inch rack cabinet

Function and interface instruction of infrared main unit panel

1. Mounting hole of 19 inch rack cabinet

2. Front panel, aluminium alloy

3. LCD display, can adjust lightness and

contrast

4. Five-dimensional operation, control keys

5. Power switch with power indicator light

6. Mounting hole of 19 inch rack cabinet

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