User's Manual

23
Audio In
The nominal differential Audio In signal shall have a level of:
TBD mVrms in Speakerphone mode
TBD mVrms in Headset mode
TBD mVrms in Raw mode
Audio Out
The nominal differential Audio Out (volume 4) signal shall have a level of:
TBD mVrms in Speakerphone mode
TBD mVrms in Headset mode
TBD mVrms in Raw mode
5.11. Audio Processing and Control
The available audio AT commands will support the following functions:
- Speaker Volume control (0-5 Steps, TBD Resolution)
- Mic gain adjustment (0 to 31dB at 1 dB step size)
- Mode selection: Speakerphone, Headset, Raw
It is the responsibility of the integrator to detect the presence of a Headset and send the appropriate AT command to the
module to switch its audio mode to ‘Headset’.
On removal of a headset the host device should send an AT command to switch the module to ‘Speakerphone’ mode.
The following table lists the applicable signal conditioning processes applied in each audio mode, Speakerphone, Headset and
Raw and in each connection mode, Interconnect or Direct connect.
Phone (Interconnect) Dispatch (Direct Connect)
Speakerphone Headset Raw
Audio
Speaker Headset Raw
Audio
Echo
cancellation/Suppression
Y Y N N N N
Noise Suppression Y Y Y Y Y Y
Sidetone N Y N N N N
Figure 3. Audio Mode
Note that the characteristics of these processes will be the same as on other iDEN portables.
5.12. COMMUNICATION
IO200 Modem can communicate via RS232 CMOS levels (0-2.7V) or USB by configuring the following main connector
lines.
MODE OPTION1
Pin10
OPTION2
Pin 11
RTS1 / USB_PWR
Pin 24
Default (Normal) 1 1 0
USB 1 1 >4.0V