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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. 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.

4. 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.

5. 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 ...

6. MPlayer - Wikipedia

   en.wikipedia.org/wiki/MPlayer

   A variety of command-line parameters allows changing the appearance of the player, including -speed [number], -af scaletempo for changing audio speed while maintaining the pitch, -ss (start at ___ seconds), -sb (start at ___ bytes), -endpos (stop playing at ___ seconds), -novideo for only playing the audio track of a video, and -loop [number ...

7. Sample-rate conversion - Wikipedia

   en.wikipedia.org/wiki/Sample-rate_conversion

   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.

8. MLB pitch clock proving to be a mental and physical game-changer

   www.aol.com/news/mlb-pitch-clock-proving-mental...

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9. Audacity (audio editor) - Wikipedia

   en.wikipedia.org/wiki/Audacity_(audio_editor)

   Screenshot of Audacity 3.2.1 on Windows showing spectrograms of an audio clip with portamento (upper panel) and the same clip after applying pitch correction, showing frequencies clamped to discrete values (lower panel) Audacity has several features to allow for spectrum analysis using the Fourier transform algorithm [31] [32] and spectrograms.