Chapter 4 Operation
Connecting the audio parts
18 4400 Mobile Phone Tester Series Serial number 0911xxx
Connecting the audio parts
The audio connection is used for testing the mobile's audio quality.
The signal follows the path shown below: the analog audio signal
from the mobile phone is fed to the AF in connector of the 4400;
the analog audio signal from the AF out connector of the 4400 can
be fed to the microphone input of the mobile phone. For best
performance you will want to use shielded coax cables.
One example of an audio signal path is a sine wave generated by
the 4400 which is fed to the headset connector of the phone,
passes through both the encoder and decoder of the mobile and
leaves the earphone.
The speech quality can be evaluated by comparing the two signals,
either by ear, or in a more quantitative approach by the audio
analyzer.
Requires Audio Option
Any audio tests with the Willtek 4400 require the Audio Option
to be installed.
GetStrt.book Seite 18 Dienstag, 21. März 2006 3:22 15
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