Georgi Gerganov 83c742f1a7 whisper : add option to speed up the audio tempo by x2 ...

Using a Phase Vocoder for speeding up the audio tempo by scaling down
the frequencies in the frequency domain.

This reduces the computation in the Encoder by a factor of 2.
The transcription accuracy is degraded, but for slow to normal speech -
it seems to be still very good.

I think this can find application for real-time transcription - i.e. the
"stream" example.

2022-11-13 16:25:43 +02:00

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