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The AMU includes several identical audio processing
cards, one for each ACP.
VOLUME CONTROL
The volume control function is achieved by digital
transmission of the knobs position to the AMU.
Volume control is achieved inside the AMU.
TMUCOMK03-T01 LEVEL 3
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AUDIO MANAGEMENT UNIT INTERFACES
TMUCOMK03-P01 LEVEL 3
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AUDIO MANAGEMENT UNIT INTERFACES
SELF EXAMINATION
Are the audio signals processed inside the ACPs ?
A - Yes
B - No
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23 - COMMUNICATIONS
23-51-00 COCKPIT LOUDSPEAKER MUTING
CIRCUIT DESCRIPTION
CONTENTS
Muting Circuit
Self Examination
TMUCOMP01 LEVEL 3
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COCKPIT LOUDSPEAKER MUTING CIRCUIT DESCRIPTION
MUTING CIRCUIT
Each crew station, captain, first officer and 3rd
occupant, is equipped with the direct muting function
managed by the Audio Management Unit.
A muting circuit is provided to avoid acoustic coupling
between the loudspeakers and the microphones.
When a transmission is keyed by any microphone, a
ground signal is delivered to the two loudspeaker
amplifiers. This ground signal decreases the gain and
band-pass of the loudspeaker amplifiers.
Note : This attenuating circuit is not operative with
the Flight Warning Computer (FWC) audio
outputs.
TMUCOMP01-T01 LEVEL 3
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TMUCOMP01-P01 LEVEL 3
COCKPIT LOUDSPEAKER MUTING CIRCUIT DESCRIPTION
EFFECTIVITY 23-51-00 Page 3
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COCKPIT LOUDSPEAKER MUTING CIRCUIT DESCRIPTION
SELF EXAMINATION
When is the muting circuit operative ?
A - The muting circuit always mutes the
audio output.
B - The muting circuit is operative only
with the hand microphone selection.
C - The muting circuit is operative when any
microphone is keyed to transmit.
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23 - COMMUNICATION
23-11-00 HF SYSTEM ARCHITECTURE
CONTENTS:
HF Transceiver
Radio Management Panels (RMPs)
System Data Acquisition Concentrator (SDAC)
Audio Management Unit (AMU)
Landing Gear and Control Interface Unit (LGCIU)
Centralize and Fault Display System (CFDS)
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HF SYSTEM ARCHITECTURE
HF TRANSCEIVER
The High Frequency (HF) system serves for all
long-distance voice communications between different
aircraft in flight or on the ground, or between the
aircraft and one or several ground stations.
The HF system operates within the frequency range of
2.8 to 23.999 MHz with 1 KHz channels spacing between
channels.
TMUCOMW04-T01 LEVEL 3
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TMUCOMW04-P01 LEVEL 3
HF SYSTEM ARCHITECTURE
EFFECTIVITY 23-11-00 Page 3
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RMPs
The RMP controls the various operations which are
transmitted to the transceiver by a numeric message
　
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