Re: edge and GSM audio
Hi Wye,
I find your question a bit vague but I hope you meant the test criteria for the audio subsystem on the handset I hope, well that is what I'm answering here,if thats not what you expect you are more than welcome to post another query
Anyway now that you have mentioned about CMU & Agllent apparatus I assume the initial testing and the PART A of the testing is complete. Now the basic test setup in this scenerio would depend on the primary setting of IA (Integrated Analog module this h/w chip configure all the interfaces and h/w components through set of register setting that are always ready during the h/w ramping).
Now we perform a module testing both for the stack and the audio subsystem.
I describe the audio subsystem tests, to the extent I remember them
1) Echo cancellation --> this primarily has two type of test first is near- echo and second is far -echo. The cretia here is that the call should never be disconnected due to far -echo. Secondly there is a distance of tolerance beyond which call should be connected for near-echo this is basical AEC testing for values of α, decay-constant etc.
2) For all decoder i.e HR,FR,EFR,AMR decoder s for all suported bitrates
Create a sutiable stream with data packets on alternative time slots for HR, with all the consequtive time slots for other codecs. Now intercept the 13th with SACCH and FACCH on random time-slots this should provide suitable range for DTX and VAD testing.
Sorry I don't remember the specific acceptance ranges as I worked on this setup about 2 years ago.
But the acceptance values can be calculated from the specification and use auto-correaltion techniques (I used corelation techniques) or acoustics precision equipment (I didn't work on them) for calculating the tolerance values.
~Kalyan.