4
1.2.4 Audio quality modes
HCS-5100 can transmit audio in four different quality
modes:
Mono, standard quality, maximum 32 channels
Mono, perfect quality, maximum 16 channels
Stereo, standard quality, maximum 16 channels
Stereo, perfect quality, maximum 8 channels
The standard quality mode uses less bandwidth and is
used for transmitting speech. The perfect quality mode
gives near CD quality and is used for transmitting
music.
1.2.5 Carriers and channels
HCS-5100 is transmitting within the 2
～
8 MHz
frequency band. It can transmit up to 8 different carrier
signals (depending on the transmitter type). Carriers 0
to 5 are according to IEC 61603-7 (see figure 1.4).
Figure 1.5 shows the band allocation.
Each carrier can carry up to 4 audio channels. The
exact number of channels per carrier depends on the
selected quality modes. Stereo signals use twice as
much bandwidth as mono signals; perfect quality uses
twice as much bandwidth as standard quality.
A mix of channels with different quality modes can be
chosen for each carrier, with the total bandwidth not
exceeding the available bandwidth. The table below
lists all possible channel combinations per carrier:
Figure 1.4 Standard band of HCS-5100 infrared language distribution system
(*6-8 MHz Extension band for carrier 6 and carrier 7)
Figure 1.5 Band allocation
Table 1.1 The numbers and quality modes of channels per carrier
Channel quality
Standard
Mono
Perfect
Mono
Standard
Stereo
Perfect
Stereo
Bandwidth
4
4 x 10 kHz
2
1
2 x 10 kHz and 1 x 20 kHz
2
1
2 x 10 kHz and 1 x 10 kHz (left) and 1 x 10 kHz (right)
1
1
1 x 20 kHz and 1 x 10 kHz (left) and 1 x 10 kHz (right)
2
2 x 10 kHz (left) and 2 x 10 kHz (right)
2
2 x 20 kHz
Possible
number
of
channels
per
carrier
1
1 x 20 kHz (left) and 1 x 20 kHz (right)
