Convert MMF to AAC
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| File extension | .aac |
|---|---|
| File category | Audio |
| Stands for | Advanced Audio Coding |
| Developer | Bell Labs, Fraunhofer IIS, Dolby Laboratories, LG Electronics, Sony Corporation (Combined Efforts) |
| Overview | AAC is the descendant of the MP3 format. It provides better sound quality using a similar bit rate as of MP3. Besides this, it uses lossy data compression but it has high standards of audio quality than of MP3. We can find this format on a number of platforms and Apple's iTunes is one such example that uses it as default audio format. Size of its file is much smaller which is approximately one-tenth of MP3 file. It also neglects the redundant information that is not even processed by the human ear and is often not noticed. Although, this format was introduced as MPEG-2 Part-7, yet, standardization was done by ISO/IEC as a part of the MPEG-2 and MPEG-4 families. It is also termed as MPEG-2 NBC (Non- Backward Compatible) because it is incompatible with MPEG-1 audio formats i.e. MP1, MP2, MP3. |
| Technical description | Modified discrete cosine transform(MDCT) algorithm is used by AAC which ensures that it provides high compression efficiency. MPEG-2 PART-7 has three default profiles namely Low Complexity (LC), Main Profile (Main) and Scalable Sample Rate (SSR). These profiles come with Perceptual Noise Substitution which enhances coding efficiency and provides excellent audio quality. Furthermore, it uses Auditory Masking to ignore the surplus information. This codec has come up with advanced features which are not available in the predecessor. These include additional sample rates ranging from 8 to 96 kHz, 48 Channels, better efficiency with a simpler filter bank, higher coding efficiency for stationary signals and higher coding accuracy for transient signals. |
| Links | wikipedia.org (opens in new tab - official documentation) |
| File extension | .mmf |
|---|---|
| File category | Audio |
| Stands for | Mobile Music File |
| Developer | Yamaha |
| Overview | It is an extension for music files which are generally used to store Mobile Ringtones. It was specially developed by Yamaha, so that cell phones can have distinctive ringtones. It is the extension of SMAF(Synthetic Music Mobile format application)which is an audio file format. With the certain changes in file format now it is possible to store graphics and text in it. This format is supported by all the portable devices and it is used for multimedia in it. These files are also capable of storing instrument data which is similar to module files( Files that can represent music). Due to this aforesaid feature, the user can develop its own instrument which can be played on devices with the same sound effect and similar chip. |
| Technical description | Yamaha’s SMAF tools can be used to create MMF files from WAV and MID file extensions. These files can have both graphics and PCM sound playback which make it distinct from MIDI. One must not get confused with SMAF and MMF. These are not similar terms. SMAF is the name of the file whereas MMF is an extension of aforesaid file format. The size of the this file is comparably smaller than the other identical files that have a common function, similar to it. These files have a great reputation in the mobile world as they can create affluent images and in addition to it, the size of the file is also small which can be easily managed or maintained. |
| Links | wikipedia.org (opens in new tab - official documentation) |
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