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Install Java 8 or above on your system.
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Copy TTS_Utils to your system (say to C:\ drive)
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Open command prompt and change to TTS_Utils directory
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Run TrimAndNormalizeAudio.bat as below:
.\TrimAndNormalizeAudio.bat -in <path-of-directory-containing-WAV-files-to-be-trimmed> -out <output-directory-where-trimmed-WAV-files-are-to-be-saved> -bps 24 -sr 48000