A phase vocoder is a type of vocoder-purposed algorithm which can interpolate information present in the frequency and time domains of audio signals by using phase information extracted from a frequency transform.[1] The computer algorithm allows frequency-domain modifications to a digital sound file (typically time expansion/compression and pitch shifting).
At the heart of the phase vocoder is the short-time Fourier transform (STFT), typically coded using fast Fourier transforms. The STFT converts a time domain representation of sound into a time-frequency representation (the "analysis" phase), allowing modifications to the amplitudes or phases of specific frequency components of the sound, before resynthesis of the time-frequency domain representation into the time domain by the inverse STFT. The time evolution of the resynthesized sound can be changed by means of modifying the time position of the STFT frames prior to the resynthesis operation
allowing for time-scale modification of the original sound file.
^Sethares, William. "A Phase Vocoder in Matlab". sethares.engr.wisc.edu. Retrieved 6 December 2020.
A phasevocoder is a type of vocoder-purposed algorithm which can interpolate information present in the frequency and time domains of audio signals by...
A vocoder (/ˈvoʊkoʊdər/, a portmanteau of voice and encoder) is a category of speech coding that analyzes and synthesizes the human voice signal for audio...
open source KievII library The PhaseVocoder: A Tutorial - A good description of the phasevocoder New Phase-Vocoder Techniques for Pitch-Shifting, Harmonizing...
then inverse transforming. See Audio timescale-pitch modification and Phasevocoder. Spectrograms can be used to analyze the results of passing a test signal...
"over-processed." Audio time stretching and pitch scaling Puberphonia Pitch shift Phasevocoder Lip syncing in music Editorial, Antares (28 January 2023). "Auto-Tune...
resembling the recent computer music techniques of cross synthesis and the phasevocoder. Many sound films and artificial soundtracks for movies and cartoons...
peak processing (SPP) technique similar to modified phase-locked vocoder (an improved phasevocoder for formant processing). Using these techniques, spectral...
are also some artists who have made vocoders an essential part of their music, overall or during an extended phase, such as the German synthpop group Kraftwerk...
newer phase 2 modulation protocol, the older protocol known as P25 became P25 phase 1. P25 phase 2 products use the more advanced AMBE2+ vocoder, which...
Issue 01, Apr 1997, pp 29–33. R.W Dobson (1993), The Operation of the PhaseVocoder – a non-mathematical introduction to the Fast Fourier Transform (FFT)...
Bourges: Mnémosyne. ISBN 2-9511363-0-7. Karpen, Richard. 2000. "Csound's PhaseVocoder and Extensions". In The Csound Book, edited by Richard Boulanger, 541–60...
of waveshaping and additive synthesis, SawX – a supersaw being phase modulated, Vocoder – a voice transformer similar to a talkbox, User Wavetable – an...
IMBE or AMBE CODEC over FSK. D-STAR - Open specification with proprietary vocoder system available from Icom, Kenwood, and FlexRadio Systems. Uses AMBE over...
The microKORG is a MIDI-capable digital synthesizer/vocoder from Korg featuring DSP-based analog modelling. The synthesizer is built in such a way that...
the vocoder. A corresponding rack version, the MS2000BR, was released without the microphone or dedicated mic input; however, it retained full vocoder functionality...
instruments to drum machines, a custom-built modular synthesizer and vintage vocoders. It combines disco, progressive rock and pop, with contributions by Paul...
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