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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 9 | System Configuration en | 401
48 Audio processing
48.1 Introduction
On the Audio Processing pages, the audio processing
parameters of all normal audio inputs and outputs in the
system can be set (see section 48.2). Audio inputs that
are configured as AVC inputs must be calibrated using
the Audio Processing pages (see section 48.3).
Audio processing parameters are changed immediately
when the Submit Equalizer button on the Audio Processing
pages is clicked. Although the changes are audible, it is
important to realize that they are not automatically
saved. If the changes are not saved they will be lost
when the network controller is reset. See section 40.4.5
for information about saving configuration settings.
48.2 Audio processing parameters
48.2.1 Equalizer
See figure 48.1 for an overview of an equalizer options
of normal audio inputs and outputs.
From left to right in figure 48.1:
• High-pass filter - A high-pass filter with a fixed
quality factor and slope.
• Shelving filter - A shelving filter for low
frequencies with a fixed quality factor.
• Full parametric section - Three full parametric
sections with adjustable quality factors, gains and
frequencies.
• Shelving filter - A shelving filter for high
frequencies with a fixed quality factor.
• Low-pass filter - A low-pass filter with a fixed
quality factor and slope.
48.2.2 Equalizer setting
Proceeds as follows to configure a filter:
1 Select the frequency of the filter from the Freq
dropdown list. See table 48.1 for a list of available
frequencies.
2 Select the gain of the filter from the G dropdown list.
See table 48.1 for a list of available gains.
3 Select the quality factor of the filter from the Q
dropdown list. See table 48.1 for a list of available
quality factors.
4 Put a check mark in the Active box of the filter to
enable the filter.
5 Click the Submit Equalizer button to submit the
changes. The changes are immediately applied to the
audio input or output.
48.2.3 Volume setting
For the audio outputs, a parametric equalizer and a
volume button is available to change the volume of the
audio output. The multi channel interface does not
provide an equalizer for each output, but does provide a
volume control button for each enabled output to
control the volume of connected basic amplifiers.
48.2.4 Spare power amplifiers
Spare power amplifiers do not provide volume and
equalizer settings for the outputs. These settings are
automatically set to the same position as the main
amplifier that is replaced by the spare amplifier.
Spare power amplifiers do have general purpose audio
inputs with an equalizer or with an AVC calibration
button depending on the configured input function.
These audio inputs remain active also when the spare
power amplifier replaces a failing main power amplifier.
figure 48.1: Audio processing - overview
Note
The default values in table 48.1 are indicated by
asterisks (*) when applicable.