Speech Loopback
WHY?
Acoustic check of the entire speech-signal transmission
in the mobile (transmit and receive).
Requirement
The mobile is not in test mode.
Make the general test preparations. The channel type
must be To digital TC.
Initiate a call with
{MOBILE}
or
{CELL.}
(the mobile must be
in a digital traffic channel).
HOW?
Press
{SP-LOOP}
in the basic test mask.
Speak into the microphone of the handset. The test set
sends the digital speech signal transmitted by the
mobile (with a delay of about 1 s) back to the mobile
unaltered.
Test Results
D
Loudspeaker of handset must reproduce words spoken into
microphone with brief delay and as little distortion as possible:
a unique opportunity of telling yourself a lot of nice things.
10
Speech Loopback IS-136 MS
10-31
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