Hildebrand developed methods for interpreting seismic data. Andy Hildebrand is the engineer that created Auto-Tune. It describes audible pitch correction in music. The term Auto-Tune has become embedded in popular culture as a common description, or generic term. Today, producers can alter the frequency without changing the speed by going digital. This is because the frequency of the wave is related to its speed via its wavelength. The duration of the sound would change too- thatвЂ™s why sped-up tapes sound chipmunk-like. Nevertheless, sound engineers canвЂ™t simply change the frequency itself. So, using a computer to correct the frequency back down or up would ensure that recording sounds in tune. In the system usually used by MIDI instruments in which pitch is assigned a number, with 440-Hz A being 69 and each semitone increasing or decreasing the pitch number by 1, it is related to frequency F by a simple formula.

The goal of pitch correction is to retune a slightly higher or lower note to the nearest semitone. The difference in note between two adjacent keys on a piano or frets on a guitar neck. Musical scales are divided into 12 pitches each separated by a semitone. Therefore manipulation of the frequency can produce a different note or hit an exact note from a noise that is slightly off-key. The A above middle C is usually defined as 440 Hz. The pitch of the note is dependent on the frequency of the sound wave. If they are little out of tune, the vocal track can still be rescued вЂ“ or ruined, depending on oneвЂ™s point of view. sometimes, the pitch of their vocal slightly misses the exact note they are trying to hit.

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