Quantum Audio Time Stretch

Quantum Audio Time Stretch (Quantum) is a stand-alone application that does only one thing: time stretching audio files.

Quantum aims in achieving high quality processing while being faster than real-time.

Features:

• Time stretch any music, track, speech or sound by any amount between 4 times slower and 4 times faster.
• Five quality settings:
  • 1 and 2 for quick previews or speech.
  • 3 (default) for the best trade-off between quality and speed. Faster than real-time on most computers.
  • 4 and 5 for the more demanding sources. Quality 5 may not run in real-time on all computers and is designed for offline processing.
• Use a modern audio time stretching algorithm with transient detection and a transient sensitivity setting.
• Support mono, stereo and multi-channel (5.1, 7.1) audio files. Fully preserve the stereo / spatial field.
• Load and save WAVE (*.wav), AIFF/AIFC (*.aiff, *.aifc) and AU Sun/NeXT (*.au) audio files, in PCM 16-bit / 24-bit integer, or in 32-bit IEEE floating point format. Also load FLAC, OGG, OPUS, MP3 and M4A files.
• Support sampling rates from 32 kHz to 192 kHz.
• The time stretching factor can be specified in many ways: length change, speed change, length from/to, tempo from/to, video FPS from/to, etc.
• Transform multiple audio files simultaneously on multi-core computers.
• Integrated mini player to preview the result before it is fully transformed.

Compared to our reference time stretching implementation Tachyon, Quantum uses the 10% of complexity that provides the 90% of the quality. It is hence much faster than Tachyon while being close in terms of quality. Note that Quantum is free for registered Tachyon users (just use your Tachyon's license key).

Presentation video: {See video at top of page}
Home page of Quantum Audio Time Stretch: www.tachyon-sonics.com/qats/index.html