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| 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) |
| File extension | .opus |
|---|---|
| File category | Audio |
| Stands for | Ogg OPUS |
| Developer | Xiph.Org |
| Overview | It is a format for audio files which compresses the audios using lossy compression. It neglects the redundant information which can not be processed by the human ear. Internet Engineering Task Force (IETF) has standardized this format. It has superseded the Vorgis and Speex. It offers low latency i.e. there is a less delay in the signal when it enters the system and when it emerges out, this results in real-time interactive communication like video conferencing. Due to its good audio quality, it is widely used by in various listening tests. |
| Technical description | OPUS has good compatibility with low-end embedded processors as it is less complex. Ranging from 6kbps to 510kbps, it can support both variable and constant bitrate coding. Also, the frame size from 2.5ms to 60ms is supported by this codec. It works smoothly and maintains stability (by avoiding the distortion) while mixing of packets from distinct streams. Speech, Hybrid and pure-CELT are the three different methods used for encoding the audios of varied frequencies. For compressing the Speech up to 8kHz, SILk is used which is an audio compression developed by Skype Limited. The next mode, Hybrid uses CELT to compress the audio files above 8kHz frequency or for wider bandwidth and frame sizes 10ms and 20ms are supported by this mode. CELT(Constrained Energy Lapped Transform) is an open and free audio compression format which is especially used in communication that requires low latency. For general audio, the last mode pure-CELT is used. CELT is used for frame sizes which are less than 10ms. |
| Links | wikipedia.org (opens in new tab - official documentation) |
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