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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. mp3DirectCut - Wikipedia

   en.wikipedia.org/wiki/Mp3DirectCut

   An MP3 file can be edited without transcoding. Cut, copy, paste, and volume change operations are provided; edits can be previewed, including a command that plays a segment without a selected region (previewing a cut) Audio normalization and pause detection; MP3 recording with ACM or LAME encoder (not bundled) Fast MP3 visualization

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. Auto-Tune - Wikipedia

   en.wikipedia.org/wiki/Auto-Tune

   The processor slightly shifts pitches to the nearest true, correct semitone (to the exact pitch of the nearest note in traditional equal temperament). Auto-Tune can also be used as an effect to distort the human voice when pitch is raised or lowered significantly, [9] such that the voice is heard to leap from note to note stepwise, like a ...

6. Audacity (audio editor) - Wikipedia

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

   Audacity is a free and open-source digital audio editor and recording application software, available for Windows, macOS, Linux, and other Unix-like operating systems. [ 4 ] [ 5 ] As of December 6, 2022, Audacity is the most popular download at FossHub, [ 8 ] with over 114.2 million downloads since March 2015.

7. AIMP - Wikipedia

   en.wikipedia.org/wiki/AIMP

   It supports the DirectSound, ASIO and WASAPI audio interfaces, and it uses 32-bit audio processing for its 18-band equalizer and built-in sound effects (Reverb, Flanger, Chorus, Pitch, Tempo, Echo, Speed, Bass, Enhancer, Voice Remover). AIMP can store the currently played media file in RAM, up to 250 MB, ensuring smooth playback.

8. Wow and flutter measurement - Wikipedia

   en.wikipedia.org/wiki/Wow_and_flutter_measurement

   Recently, digital pitch correction has been applied to some films, which corrects the pitch without altering lip-sync, by adding in extra cycles of sound. This has to be regarded as a form of distortion, as there is no way to change the pitch of a sound without also slowing it down that does not change the waveform itself.

9. Sample-rate conversion - Wikipedia

   en.wikipedia.org/wiki/Sample-rate_conversion

   Sample-rate conversion prevents changes in speed and pitch that would otherwise occur when transferring recorded material between such systems. More specific types of resampling include: upsampling or upscaling; downsampling, downscaling, or decimation; and interpolation.