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Compare file sizes of different voice recording formats
    ONE minute of voice recording creates the following file size on your computer:
  1. One minute voice recording in .prm takes 36 Kb
        To record your voice in .prm format,
  2. One minute voice recording in .mp3 takes 60 Kb
        To record your voice in .mp3 format,
  3. One minute voice recording in .gsm takes 95 Kb    
      To convert existing audio files to GSM 6.10 8kHz
    • Go to Start > Programs > Accessoires > Entertainment > Sound Recorder
    • Select Open from the File menu. Select the desired WAV file, and click OK
    • Select Save As... from the File menu
    • Click Change to display the Sound Selection dialog box
    • Select GSM 6.10 from the Format list box
    • Select 8 kHz, Mono from the Attributes list box, and click OK
    • Specify a new Filename, if desired, and click Save
  4. One minute voice recording in .wav takes 960 Kb
        Go to Start > Programs > Accessoires > Entertainment > Sound Recorder to record a WAV file
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