Hear Clear - Motorola APX 8500 Manual

Secure Operations

Hear Clear

Hear-Clear is a noise reduction system which composed of Companding and Random FM Noise Canceller.
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Companding:
Reduces the channel noise such as OTA transmission that is predominantly present in UHF2 and 900 MHz
channel with the following features.
Compressor – reduces the background noise flow and the speech signal at transmitting radio.
Expander – expands the speech while the noise flow remains the same at receiving radio.
•
Random FM Noise Canceller (Flutter Fighter):
Reduces the unwanted effects of random FM noise pulses caused by channel fading under high Signal-to-
Noise (S/N) conditions such as in a moving in a transportation.
The fading effects, heard as audio pops and clicks, are cancelled without affecting the desired audio signal.
The Random FM Noise Canceller operates only in receive mode.
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ADVANCED FEATURES
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