What is the difference between .m4r and .sph?
- Extension
- .m4r
- .sph
- Format
- Binary
- Binary
- Category
- Audio
- Audio
- Developer
- Apple Inc.
- NIST
- Description
- M4R is an iTunes ringtone file that stores mono channel audio. They are identical to the M4A format files only that they are correctly used for ringtones.
- 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-m4r
- audio/x-nist-sph