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[hts-users:03228] How to choose fft length?

I want to change the frame shift length from 5ms to 10ms.
But I don't know whether the fft length should be changed either.
The wav files' sampling rate I use is 16000Hz. As we know, the default fft length
for sampling rate 48000 is 2048.
Then what's the fft length should I choose? Does it have something to do with
sampling rate or frame shift length?