What is the difference between .m4r and .cvsd?
- Extension
 - .m4r
 - .cvsd
 
- Format
 - Binary
 - Binary
 
- Category
 - Audio
 - Audio
 
- Developer
 - Apple Inc.
 - Adaptive Digital Technologies
 
- 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.
 - Continuously Variable Slope Delta Modulation Audio is a headerless format used to compress speech audio for applications such as voice mail.
 
- MIME Type
 - audio/x-m4r
 - audio/x-cvsd
 
- Wikipedia
 - .m4r on Wikipedia
 - .cvsd on Wikipedia