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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 ...
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.
V-M designed a two-speed changer after Columbia Records introduced the LP in 1948, then added the 45rpm speed after RCA brought that innovation to market in 1949. In 1954, V-M added the fourth speed (16⅔ rpm) for "talking books." A new changer mechanism, used throughout the 1950s, 1960s, and 1970s was developed in 1950.
For example, Compact Disc Digital Audio and Digital Audio Tape systems use different sampling rates, and American television, European television, and movies all use different frame rates. Sample-rate conversion prevents changes in speed and pitch that would otherwise occur when transferring recorded material between such systems.
Technics SL-1210MK2 turntable pitch control slider. 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]
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