Sennheiser Electric Heater SZI 1029-10 User Manual download pdf (Page 15)

INFRA-RED TECHNOLOGY The SZI 1029 is a high power infra-red radiator. In a cordless infra-red

sound transmission system it transforms the electrical signal delivered

by an infra-red modulator or by an audio source into invisible infra-red

light and radiates this IR light into a room. In contrast to radio

transmission infra-red transmission is limited to the room, thus other

systems can be operated in neighbouring rooms without interference.

씰 The high-power radiator SZI 1029 is switched on by the IR carrier

signal that is produced by the modulator. Commercially available

50 Ω coaxial cables with BNC connectors are used for feeding

sig nals from the modulator to the SZI 1029 radiator.

The infra-red radiator diodes in the high power radiator respond to the

received signals and radiate modulated infra-red light. Depending on

the model the radiator delivers a radiating power of 5 or 10 W

(see

AVAILABLE MODELS).

WIDEBAND Infra-red wideband transmission systems are chiefly used for transmitting

audio signals in hi-fi quality.

The two available wideband channels (2.3 MHz and 2.8 MHz) are

internationally standardized and are either used for two mono channels

or for stereo transmission.

NARROW-BAND Infra-red narrow-band transmission systems allow the transmission of

up to 32 mono channels with a slightly reduced audio frequency response.

They are ideal for multi-channel interpretation systems and multilingual

information systems.

AREAS OF APPLICATION

씰 Conference and simultaneous interpretation systems

씰 High quality cordless sound transmission in recording studios

or for hi-fi systems

IMPACT OF CURTAINS,

• Dark and heavy materials, curtains, carpets, panellings, and wall

CARPETS, AND PAINTS coverings tend to absorb the light, a good reception can only be

achieved in direct line of sight of the infra-red radiator.

• Roughcast and strongly structured wallpapers (such as woodchip,

embossed or fabric papers) reflect the light unevenly but allow a

more uniform propagation of the infra-red signal.

• Smooth and bright walls, smooth tiled floors and windows are

highly reflective and are thus favourable for the propagation of in

fra-red light.

• Different wall paints may reflect infra-red light differently although

they have the same colour. This is due to the type and thecomposit-

ion of the paint pigmentation.

The power which is necessary to irradiate a room varies accordingly.

IR-Licht

Reflexion

IR-Licht

Reflexion

IR-Licht

Reflexion

IR light IR light

IR light

Reflection Reflection Reflection

PROPAGATION OF The propagation of the infra-red signal radiated by the SZI 1029 can be

INFRA-RED LIGHt compared to the propagation of normal daylight or artifical (lamp) light.

Thus it is subject to similar conditions when it falls onto different

materials:

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Sennheiser Electric Heater SZI 1029-10 User Manual Page 15

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