Please excuse me if my terminology is wrong. I'm from a music production background and have no experience in signal processing.
I was wondering if it was possible to stretch out the overtones (partial tones) of sound through digital signal processing. In the natural harmonic series or the overtone series, there is the fundamental frequency. Then you have overtones at integer multiples of the fundamental frequency. Is there a software which would let me alter the ratio between the different overtones of the sound? For example, If I have an audio file of 0-20,000 hertz. How can I take the first 10,000 hertz of the audio spectrum and stretch it out to 20,000 hertz so that all the overtones are spaced wider and the ratio is doubled.
It's called Frequency Scaling or Pitch Scaling I believe. I do understand the difference between Frequency shifting and Frequency Shifting and I'm curious to experiment with Frequency Scaling and not Frequency shifting.
I'm looking to do something like this.