UTAU/Resamplers

UTAU allows the use of different resamplers. This page is a list of the currently known resamplers, and information on them.

resampler.exe
resampler.exe is the resampler which comes bundled by default with UTAU. It was developed by Ameya, and an early version of it was used as the default resampler for the software loliedit, which is considered an early version of UTAU. resampler.exe generates *.FRQ files. Its most recent public release is 14.02r_4.18e.

Model4
Model4 was also developed by Ameya, and was released only to a small group of testers. Not much is known about it, other than that it doesn't work very well with most voicebanks, but works very well with a select few voicebanks.

fresamp
fresamp is known for eliminating sample noise, strengthening voicebanks and making samples sound more nasal when used in higher ranges. It takes a very long time for fresamp to render when compared to other resamplers. Its most recent public release is 014.

TIPS
TIPS is known for working well with soft banks and low notes. With certain voicebanks, it can make them sound more metallic or emphasize existing sample noise. It was developed by ScientistB, and it generates *.PMK files.

EFB-GW
EFB-GW (also known as WORLD) is an open-source resampler, built using the FFTW framework.

world4utau
world4utau is a resampler built using the FFTW framework. It is very picky with what voicebanks it works with, seeming to only work with voicebanks recorded at 44100Hz 16bit with no sample metadata.

moresampler
moresampler is a resampler programmed by computer scientist Kanru Hua. It has its own set of flags, and an auto oto generator for VCV Japanese, CVVC Japanese and Arpasing English voicebanks. It is very good at rendering voicebanks in a way that sounds similar to its original samples. It renders much faster than most other UTAU resamplers. Its most recent public release is 0.8.0.

Unnamed SMS resampler
A demo for an unnamed spectral-model-synthesis-based resampler was posted by isengaara on an English speaking forum focused on UTAU and other synthesizers. This resampler has presumably never had a public release.

Demo: Archive.org