Motorola MTP850 Ex Product Information Manual page 98

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18.13 Audio Features
18.13.1 Feature Overview
There are many situations where the demand of audio quality changes according to the working
environment. For example, an airport worker, who works partly in the field where there is lots of
noise coming from the surrounding environment and partly inside the airport where there is relatively
less noise, may experience different audio quality. In the working environments like this, there is a
need of different audio quality and subsequently adaptive audio parameters which can be
configured according to the working environment.
When accessing the Main Menu and selecting Set Up, the "Audio" mode will show the following
three fields: <Audio Profiles>, <Howling Supr> and <Audio Toggle>.
By selecting Audio Profiles, the user will have a choice to select an audio profile among the
available ones.
18.13.2 Audio Profiles
An audio profile is a profile that adjusts the audio parameters of the terminal so that it can be
changed to fit its current operating environment. The following parameters can be changed in an
audio profile according to a particular working environment:
• Receive and transmit gains
• Receive and transmit EQ filters
• AGC, Echo Canceller and RX/TX Noise suppressor
• Tone volume
The Audio Profiles are created from the templates provided by Motorola. These templates can not
be changed by customers.
The customer has the ability to create several profiles based on one template. Several audio profiles
can be created based on the same template to serve the different purposes. The number of Audio
templates available to the Customer CPS can be configured in the Depot/LAB CPS.
18.13.2.6 Templates and Profiles
There is a clear distinction between an audio template and an audio profile. Audio templates are
provided by Motorola with each template have a range of default values which customers can not
change. The customer/user can use the audio template in order to create audio profiles for his/her
own use.
18.13.2.7 Templates Provided by Motorola
The templates enable users to select the appropriate audio configuration for meeting the
transmission level plan of the TETRA standard and achieving suppression of acoustic feedback
(howling). The configuration to use is determined by the average C-weighed sound pressure of the
background noise.
A profile should be created for each of the environments in which the radio will be used, for example:
one profile created with the "Indoor" template for indoor use and another one created with: "Outdoor
Noisy, type2" template for outdoor use.
To achieve the best possible audio performance when users change their operational environment
(for example: leaving an indoor environment and entering a noisy outdoor environment), users
should select an appropriate profile for the new environment using the radio menu.
6866588D21-D Chapter 2 - MTP850 Ex/MTP810 Ex Product Information Manual
Services and Feature Description
March 2009