Speech Speed Conversion Software

Product Overview

In audiobooks and language learning, there has long been a need not only for the ability to listen to audio files faster or slower, but also for the ability to change the playback speed without changing the pitch of the voice for easier listening.

TMC has developed and commercialized a software IP that minimizes the change in voice height when the playback speed changes, and enables playback of voices close to the original pitch for easy listening.

Product Number

  • TM1849


  • Proprietary voice signal processing and no patent fees are required.
  • Unique speed conversion technology to minimize changes in sound pitch and to make voice playback easier to listen.
  • Dynamic and frame-by-frame changeable playback speed even during playback


Data Sampling Frequency 16k Hz, 22.05k Hz, 24k Hz, 32k Hz, 44.1k Hz, 48k Hz
Input/output Data Format 16-bit linear PCM (monaural or stereo)
Frame Length (processing unit) 1152 samples/channel (customizable)
Playback Speed 0.5 to 2.0 times
Playbeck Speed Setting Dynamic change in frames

Example of execution