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2. Audio time stretching and pitch scaling - Wikipedia

   en.wikipedia.org/wiki/Audio_time_stretching_and...

   The simplest way to change the duration or pitch of an audio recording is to change the playback speed. For a digital audio recording, this can be accomplished through sample rate conversion. When using this method, the frequencies in the recording are always scaled at the same ratio as the speed, transposing its perceived pitch up or down in ...

3. Pitch shifting - Wikipedia

   en.wikipedia.org/wiki/Pitch_shifting

   Pitch shifters are included in most audio processors today. A harmonizer is a type of pitch shifter that combines the pitch-shifted signal with the original to create a two or more note harmony. The Eventide H910 Harmonizer, [2] released in 1975, was one of the first commercially available pitch-shifters and digital multi-effects units. On ...

4. Eltro information rate changer - Wikipedia

   en.wikipedia.org/wiki/Eltro_Information_Rate_Changer

   The Eltro information rate changer was an analog recording tool for changing pitch without changing speed and vice versa. Patents for the device date from the 1920s. [1] The Eltro was the first machine capable of changing audio pitch (frequency) and speed (time) independently of each other.

5. Pitch correction - Wikipedia

   en.wikipedia.org/wiki/Pitch_correction

   Pitch correction devices do this without affecting other aspects of its sound. Pitch correction first detects the pitch of an audio signal (using a live pitch detection algorithm), then calculates the desired change and modifies the audio signal accordingly. The widest use of pitch corrector devices is in Western popular music on vocal lines.

6. Pitch control - Wikipedia

   en.wikipedia.org/wiki/Pitch_control

   A variable speed pitch control (or vari-speed) is a control on an audio device such as a turntable, tape recorder, or CD player that allows the operator to deviate from a standard speed (such as 33, 45 or even 78 rpm on a turntable), resulting in adjustments in pitch. [1]

7. Musical tuning - Wikipedia

   en.wikipedia.org/wiki/Musical_tuning

   Tuning is the process of adjusting the pitch of one or many tones from musical instruments to establish typical intervals between these tones. Tuning is usually based on a fixed reference, such as A = 440 Hz. The term "out of tune" refers to a pitch/tone that is either too high or too low in relation to a given reference pitch. While an ...