It can be used to pitch correct instruments like guitars and violins that may be slightly out of tune, shift the formant of a vocal to make it seem deeper and darker or higher more chipmunk-like. Here is the wiki page if you’re interested in learning more: īut vocal pitch correction is not the only thing autotune is good for. This whole process requires advanced mathematics known as STFT (Short-time Fourier transform). This process results in a natural sounding waveform even though it has been digitally altered.
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This is what is typically known as the “sample rate”.Īutotune works by first altering the duration of each of the digital samples, and then changing the pitch of the sample such that the sample hits both the correct frequency and maintains the original duration. In the digital world, the analogue waveform will be broken down into samples at equal points along the waveform, the closer these samples are together, the higher the quality of the digital sound will be. If you look at an analogue signal or waveform it will look like one smooth, continuous line (see the light green line below). It was the first audio plugin that was able to change the pitch of vocals and other solo instruments without producing any artifacts or distortion.
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In 1997 autotune was introduced to the world by a company called Antares. It can be used aggressively to create that robotic “T-Pain” effect or more subtly to gently correct any vocal line to make it sound like it was sung perfectly. Autotune is a popular pitch correction tool that has blown up to become one of the most recognisable, loved, and hated sounds of modern day music.