9 Talker dependency, Experiment 8
3GPP46.008Half rate speechPerformance Characterization of the GSM Half Rate speech codecRelease 17TS
From the results obtained in the two laboratories which conducted this experiment, the performance of any given condition undoubtedly varies from talker to talker.
The existence of this talker dependency has been confirmed by a further analysis applied to the results from the first phase of characterization testing.
Under error free conditions, it was shown in the tests carried out, that the talker dependency for the half rate codec is similar to that for the full rate.