.SPH File Extension


Developer NIST
3.7  |  9 Votes
NEW: Open your .SPH file online with File Helper.View Online

What is an SPH file?

An SPH file is a waveform audio file created in the NIST SPHERE format, which is often used in speech recognition research. It usually contains a recording of a person speaking. SPH files can be provided as input to speech recognition systems.

More Information

SPHERE waveforms use 16-bit linear PCM and a 16KHz sample rate. They have a 1024 byte human-readable header that uses ASCII text formatting.

NOTE: SPH files can be converted to the .WAV format using a utility called sph_convert or SoX.

How to open an SPH file

Because SPH files are uncommon, most popular media players cannot play them. However, you can play SPH audio in VLC media player, and you can convert SPH files to a more usable audio format using FFmpeg or SoX.

Programs that open SPH files

MikuMikuDance Sphere Mapping File

Developer MikuMikuDance
3.5  |  4 Votes

3D model effects file used by MikuMikuDance, a game where players control vocaloid virtual dancing characters; contains a .BMP image but uses the ".sph" extension instead; can used for adding a shiny look to 3D model features such as hair or clothes.

More Information

SPH files may also incorporate transparency (e.g., .PNG or .TGA images), but they are most commonly created from non-transparent bitmap images.

NOTE: To create a SPH file, draw a bitmap (".bmp") image with any graphics editor and rename the file extension to ".sph."

Programs that open or reference SPH files


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