Figure 33 Audio interface
The two digital microphones, Digi mic 1 and Digi mic 2, are connected directly to RAPU.
The earpiece is driven directly by a built-in amplifier included in EM ASIC.
The IHF speaker is driven directly by a built-in stereo amplifier included in EM ASIC.
The vibra is driven directly by a built-in amplifier included in EM ASIC.
Internal earpiece
The internal earpiece used is Lean (6 x 12) and it is connected to EM ASIC EARP and EARN lines.
Figure 34 Internal earpiece diagram
Internal handsfree (IHF) speakers
IHF speakers used are Donau.
RM-750
System Module
Issue 1 COMPANY CONFIDENTIAL Page 6 – 25
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