Just wondering if it's possible to go through a flac, mp3, wav, etc file and edit portions, or the entire file by removing sections based on a specific frequency range?
So for example, I have a recording of a friend reciting a poem with a few percussion instruments in the background. Could I write a C program that goes through the entire file and cuts out everything except the vocals (human voice frequency ranges from 85-255 Hz, from what I've been reading)?
Thanks in advance for any ideas!
It is certainly possible, otherwise digital studio mixing software wouldn't exist.
What your'e effectively asking for is to attenuate frequency ranges across an entire file. In analog land, you would apply a low-pass and a high-pass filter (or some other combination of filters) to attenuate the frequencies.
In software, you'd solve this problem by writing a digital filter of sorts that would reduce the output of various frequencies. Frequencies would be identified via an FFT computation.
The fastest thing to do would be to use an audio editing app and apply the changes there.
There is an audio library called PortAudio that may provide some support for editing an audio stream at the numerical level. It is written in C, and has a C API.