Bosch INTEGRUS Specifications download pdf (Page 10)

Bosch Security Systems B.V.

6 | System Description and Planning

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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 convert the

carrier signals to modulated infra-red light.

In the IR receivers a reverse processing is used to convert

the modulated infra-red light to separate analogue audio

channels.

Figure 3: Overview of the signal processing (for one carrier)

Quality modes

The Integrus system can transmit audio in four different

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 premium quality

mode gives near CD quality.

Carriers and channels

The Integrus system can transmit up to 8 different carrier

signals (depending on the transmitter type). Each carrier

can contain up to 4 different audio channels. The maximum

number of channels per carrier is dependent on the selected

quality modes. Stereo signals use twice as much bandwidth

as a mono signals, premium quality uses twice as much

bandwidth as standard quality.

Per carrier a mix of channels with different quality modes is

possible, as long as the total available bandwidth is not

exceeded. The table below lists all possible channel

combinations per carrier:

Aspects of infra-red distribution systems

A good infra-red distribution system ensures that all

delegates in a conference venue receive the distributed

signals without disturbance. This is achieved by using

enough radiators, placed at well planned positions, so that

the conference venue is covered with uniform IR-radiation of

adequate strength.

There are several aspects that influence the uniformity and

quality of the infra-red signal, which must be considered

when planning an infra-red radiation distribution system.

These are discussed in the next sections.

Directional sensitivity of the receiver

The sensitivity of a receiver is at its best when it is aimed

directly towards a radiator. The axis of maximum sensitivity

is tilted upwards at an angle of 45 degrees (see figure 4).

Rotating the receiver will decrease the sensitivity.

For rotations of less than +/- 45 degrees this effect is not

large, but for larger rotations the sensitivity will decrease

rapidly.

Figure 4: Directional characteristics of the receivers

The footprint of the radiator

The coverage area of a radiator depends on the number of

transmitted carriers and the output power of the radiator.

The coverage area of the LBB 4512/00 radiator is twice as

large as the coverage area of the LBB 4511/00. The

coverage area can also be doubled by mounting two

radiators side by side. The total radiation energy of a

radiator is distributed over the transmitted carriers.

When more carriers are used, the coverage area gets

proportionally smaller. The receiver requires a strength of

the IR signal of 4 mW/m2 per carrier to work without errors

(resulting in a 80 dB S/N ratio for the audio channels).

The effect of the number of carriers on the coverage area

can be seen in figure 5 and figure 6. The radiation pattern is

the area within which the radiation intensity is at least the

minimum required signal strength.

Channel Quality

Mono

Standard

Mono

Premium

Stereo

Standard

Stereo

Premium

Bandwidth

44 x 10 kHz

21 2 x 10 kHz and

1 x 10 kHz

212 x 10 kHz and

1 x 10 kHz (left) and

1 x 10 kHz (right)

11 1 x 20 kHz and

1 x 10 kHz (left) and

1 x 10 kHz (right)

2 2 x 20 kHz (left) and

2 x 10 kHz (right)

22 x 20 kHz

1 1 x 20 kHz (left) and

1 x 10 kHz (right)

4x4x

Audio

Channel

A/D Conversion

& Compression

Protocol Creation

& Modulation

Audio

Channel

Carrier (to IR Radiators)

A/D Conversion

& Compression

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 45 46

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Bosch INTEGRUS Specifications Page 10

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