Normalize audio sph

Download and install the latest version of Filestar.
Right click on one or more Sph file(s) on your desktop and select Convert with Filestar.
Type normalize audio in the search box.
Press Run.

What is .sph?

Name: NIST SPHERE Audio File
Extension: .sph
Format: Binary
Category: Audio
Developer: NIST
Description: Waveform audio file created in the NIST SPHERE format, which is often used in speech recognition research; often contains a recording of a person speaking; can be provided as input to speech recognition systems.
MIME Type: audio/x-nist-sph
Sample: sample.sph
Wikipedia: .sph on Wikipedia

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Last updated October 9, 2026