Gemalto M2M GmbH AHS3-US User Manual
AHS3-US Hardware Interface Overview
3.6 Analog Audio Interface
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AHS3-US_HIO_v02.540
Page 26 of 39
2012-09-05
Confidential / Preliminary
3.6
Analog Audio Interface
AHS3-US has an analog audio interface with a balanced analog microphone input and a bal-
anced analog earpiece output. A supply voltage and an analog ground connection are provided
at dedicated pins.
anced analog earpiece output. A supply voltage and an analog ground connection are provided
at dedicated pins.
AHS3-US offers six audio modes which can be selected with the AT^SNFS command. The
electrical characteristics of the voiceband part vary with the audio mode. For example, sending
and receiving amplification, sidetone paths, noise suppression etc. depend on the selected
mode and can be altered with AT commands (except for mode 1).
electrical characteristics of the voiceband part vary with the audio mode. For example, sending
and receiving amplification, sidetone paths, noise suppression etc. depend on the selected
mode and can be altered with AT commands (except for mode 1).
When shipped from factory, all audio parameters of AHS3-US are set to audio mode 1. This is
the default configuration optimised for the Votronic HH-SI-30.3/V1.1/0 handset and used for
type approving the Cinterion Wireless Modules reference configuration. Audio mode 1 has fix
parameters which cannot be modified. To adjust the settings of the Votronic handset simply
change to another audio mode.
the default configuration optimised for the Votronic HH-SI-30.3/V1.1/0 handset and used for
type approving the Cinterion Wireless Modules reference configuration. Audio mode 1 has fix
parameters which cannot be modified. To adjust the settings of the Votronic handset simply
change to another audio mode.
3.7
Pulse Code Modulation Interface (PCM)
AHS3-US’s PCM interface can be used to connect audio devices capable of pulse code mod-
ulation.
ulation.