System technology, IR radiation | Bosch Appliances 3122 475 22015en

INTEGRUS Installation and User Instructions System description and planning	en 2

1.2 System technology

1.2.1 IR radiation

The Integrus system is based on transmission by mod- ulated infra-red radiation. Infra-red radiation forms part of the electro-magnetic spectrum, which is com- posed of visible light, radio waves and other types of radiation. It has a wavelength just above that of visible light. Like visible light, it is reflected from hard sur- faces, yet passes through translucent materials such as glass. The infra-red radiation spectrum in relation to other relevant spectra is shown in figure 1.2.

100

75
75


	1
50


25








	4
0		2			5	3
400		500	600	700	800	900	1000 nm

1Daylight spectrum

2Sensitivity of the human eye

3 IR radiator

4 Sensitivity of IR sensor

5 Sensitivity of IR sensor with daylight filter

Figure 1.2 Infra-red radiation spectrum in relation to other spectra

1.2.2 Signal Processing

The Integrus system uses high frequency carrier signals (typically 2-8 MHz) to prevent interference problems with modern light sources (see section 1.3.2). The digi- tal audio processing guarantees a constant high audio quality.

The signal processing in the transmitter consists of the following main steps (see figure 1.3):

1.A/D conversion - Each analogue audio channel is converted to a digital signal.

2.Compression - The digital signals are compressed to increase the amount of information that can be distributed on each carrier. The compression factor is also related to the required audio quality.

3.Protocol Creation - Groups of up to four digital signals are combined into a digital information stream. Extra fault algorithm information is added. This information is used by the receivers for fault detection and correction.

4.Modulation - A high frequency carrier signal is phase-modulated with the digital information stream.

5.Radiation – Up to 8 modulated carrier signals are combined and sent to the IR radiators, which con- vert the carrier signals to modulated infra-red light.

In the IR receivers a reverse processing is used to con- vert the modulated infra-red light to separate analogue audio channels.

1.2.3 Quality modes

The Integrus system can transmit audio in four differ- ent quality modes:

•Mono, standard quality, maximum 32 channels

•Mono, premium quality, maximum 16 channels

•Stereo, standard quality, maximum 16 channels

•Stereo, premium quality, maximum 8 channels

The standard quality mode uses less bandwidth and can be used for transmitting speech. For music the pre- mium quality mode gives near CD quality.

Audio

Channel

Audio

Channel

A/D Conversion

&Compression

A/D Conversion

& Compression

Protocol Creation

& Modulation

Carrier (to IR Radiators)

Figure 1.3 Overview of the signal processing (for one carrier)

Bosch Security Systems 2005-04 3122 475 22015en

3122 475 22015en specifications

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Bosch Appliances 3122 475 22015en manual System technology, IR radiation, Signal Processing

Models: 3122 475 22015en