Audio rate conversion method by Ffmpeg

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Can convert wav to 16kHz- >11.025kHz

ffmpeg -i fetch-voice.wav -f wav -ar 11025 fetch-voice_11025.wav

This was good https://qiita.com/okamos/items/684c59928dbe9bf9bbcd

The following is for reference

https://qiita.com/suzutsuki0220/items/43c87488b4684d3d15f6

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