Is it possible to resample a recording (as opposed to downsampling). If for instance I record at a rate of 250000 thinking there may be some high frequency bats, but in fact there are none, but there are some bird calls of interest. Then to save space and to listen to the recordings at correct pitch I would like to convert file to 48000 (just as if I had recorded at that rate in the first place). My go-to software for listening / processing audio is Adobe Audition and that does not support playing files with sample rates above 192000 - so I can't just listen to these high sample files with that. Well I am sure it must be possible, but I am not sure what software to use. I have Adobe Audition, but that will covert to a lower rate by stretching out the file. And the AM tool reduces pitch.
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To see this working, head to your live site.
It is straightforward to resample a recording using Audacity - and an anti-aliasing filter is automatically applied before down-sampling.
The procedure is a bit counter-intuitive, though, and you control the sample rate of an exported file by setting the "Project Rate" at the bottom left of the Audacity window.
The "Rate" option on the track drop-down just changes the playback rate without resampling the data - so it changes the pitch and speed, as you have observed. Whilst the "Resample" option on the Tracks menu does what it says, it only resamples the selected track within Audacity and is used when you are mixing tracks recorded with different sample rates.
Whatever the sample rate of an individual track within the program, it will always be resampled if necessary and exported with the selected Project Rate.
Hope that may be helpful.
I don’t think that does what I want ?
So I recorded at 250000 to see if there were high frequency bats in the area. In fact there was not much of interest at high frequency but there was some bird calls at a few kHz. So I want to just discard the high frequencies and keep the lower frequencies- just as if I had sampled at 48000 to start with. So making a smaller more manageable file, without any pitch shift.