SMAF is a multimedia data format invented by Yamaha. The SMAF specification defines a format for multimedia files which can be played back on hand-held portable devices. At present, SMAF is chiefly used for creating ring tones for mobile phones.
Yamaha also manufactures various sound chips which are expressly designed to play back SMAF audio files. These chips feature in many of today's mobile phones and other hand-held devices.

The SMAF specification defines the format for multimedia files which can be played back on hand-held portable devices. Although at present SMAF is mostly used to create audio files, such as ring tones for mobile phones, the full specification includes support for graphics as well.
Outline of SMAF Specification can be viewed here.

A number of free software tools can be downloaded from this site, enabling users to develop SMAF content for mobile phones and other devices.
These tools include applications for creating new SMAF data files (.mmf files), applications for converting existing files in other formats (such as .wav or standard MIDI .mid files) to SMAF, and sound sample libraries for use in authoring SMAF content.
SMAF files can be downloaded from the world-wide web, or transmitted and received as e-mail attachments, using either a PC or a mobile phone.

SMAF's impressive audio capabilities are best illustrated by example. To hear a sample SMAF audio file, first download a sequencing application from the Tool Downloads page, download a demo file from the Demo Page, then use the sequencer to play it back on your PC.
Hear the awesome potential of SMAF-then unleash your creative powers!

The Yamaha MA-1, MA-2, MA-3, MA-5, and MA-7 sound generator LSIs feature in many different mobile phone models. Yamaha also manufactures a sound generator LSI for PDAs. Any device incorporating one of these chips is capable of playing back SMAF audio files.

Numerous mobile phone manufacturers have incorporated Yamaha sound generator LSIs into their handsets, enabling them to use SMAF files as ring tones.
For complete lists of SMAF-compatible handsets, please refer to the Mobile Phone Compatibility Charts.