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audio - Algorithm to change speech pitch - Stack Overflow
https://stackoverflow.com/questions/55907260/algorithm-to-change-speech-pitch
PSOLA (Pitch Synchronous Overlap and Add) is a digital signal processing technique used for speech processing and more specifically speech synthesis. It can be used to modify the pitch and duration of a speech signal. Example code is https://github.com/joaocarvalhoopen/Pitch_Shifter_using_PSOLA_algorithm
Time Stretching And Pitch Shifting of Audio Signals – An ...
http://blogs.zynaptiq.com/bernsee/time-pitch-overview/
Typically, good algorithms allow pitch shifting up to 5 semitones on average or stretching the length by 130%. When time stretching and pitch shifting single instrument recordings you might even be able to achieve a 200% time stretch, or a one-octave pitch shift with no audible loss in quality
The Algorithm Inspector
https://helpcenter.celemony.com/M5/doc/melodyneStudio5/en/M5tour_NA_Mode_2?env=standAlone
Robust pitch curves: With the algorithms “Melodic” and “Percussive Pitched”, Melodyne detects the Pitch Curve in very high resolution. This is especially advantageous in the case of vocals, as there is then particularly detailed control over all aspects of the intonation, and the pitch tools are able to deliver optimal sound quality.
Pitch Transposer (Data Controlled) [Analog Devices Wiki]
https://wiki.analog.com/resources/tools-software/sigmastudio/toolbox/adialgorithms/pitchmodification/pitchtransposerdatacontrolled
Algorithm Description The algorithm takes an input signal and shifts it in frequency up or down depending on the value of the the frequency shift control signal. The control input value should be the shift percentage divided by the sampling rate, for example for a shift of +100%: control signal = (100 / 48000) = 0.0020833 (fixed-point)
Programmatically increase the pitch of an array of audio ...
https://stackoverflow.com/questions/5156192/programmatically-increase-the-pitch-of-an-array-of-audio-samples
You can change the pitch, as well as make the sound play faster or slower by the same ratio, by just resampling the signal using properly filtered interpolation. Just move each sample point, instead of by 1.0, by floating point addition by your desired rate change, then filter and interpolate the data at that point.
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