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Is it due to vocal length normalization during MFCC? Please be kind enough to explain.

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  • $\begingroup$ I would say it depends on the technology used, analog, digital, if digital, which codec, etc. $\endgroup$
    – sobek
    Commented Sep 9, 2018 at 19:42

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In the case of switched analog POTS phone lines, the audio response is shaped by the limited frequency response of the carbon microphone and the speaker in the handset.

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