When I try to resample an audio file I go to track->resample then set the new sample rate and the sample rate appears as the changed one then I click file->export and save it as wav. When I open the file again and it still shows the old sample rate although the sound sounds different as it was resampled. Why is that happening?
At the bottom left of the main Audacity screen when you're editing the audio is a drop-down menu labelled "Project Rate (Hz)". If you import, for example, a 96k audio file, the project rate automatically adjusts to 96000. When you resample the track though, say to 48k, the project rate remains 96000. You need to manually lower the project rate with the drop-down menu after resampling the tracks to 48000 (or whatever). When you export the finished audio it does so at the project rate, not the track rate, so you effectively resampled the thing down and back up again. The project rate setting is there for when people are creating multi-track projects, importing from audio files with disparate sample rates.
Steps to down sample:
- Open track to be converted (File|Open).
- Select Required Project Rate (Drop down box in bottom left corner).
- Select the track by clicking on the left side of the display (below the line Format, Rate, Processing) Example - [Stereo,192000HZ-32-bit float].
- Select Tracks|Resample
- Select required File Hertz Rate (From Drop Down Box).
- Save down sampled file using File|Export.