Ringtone function

The current ringing function of mobile phones refers to the main effects of ring tones such as monophonic or chordal sounds, memory ringing capacity, self-configured ringing/recording ringing, and downloading of ring tones.

Mono/chord sound

Mono: Monophonic ringtones are sounds that consist of a single tone. Monophonic ringtones can be said to have become obsolete.

Chord Tone: Chords are superimposed on the pitch in a rule that is based on a three-fold superposition of the root.

Memory ringtone

Currently, mobile phones are all equipped with memory ringtones. Generally, these ringtones are mostly based on famous songs or current popular songs. The number or types of memory ringtones are controlled by mobile phone manufacturers.

Make/record ringtones

With the increasing popularity of mobile phones, people’s demands for mobile phones are getting higher and higher. Mobile phones have become not only a means of communication for people but also become a manifestation of people’s personalities. Therefore, more and more people are reluctant to use only manufacturers to provide them. Ringtones for your phone. This self-compilation / recording function came into being, this feature can be customized according to the user's own preferences or record other sounds as their mobile phone ringtones.

Download ringtone

The download ringtone function allows users to download off-the-shelf ringtones on the Internet or other ways. This can satisfy the user's individual needs and eliminate the need for self-produced troublesome procedures.

The current mobile phone ringtones are various, like what midi, mp3, wav, and many kinds of ringtones, but do you know what these ringtones are specifically? Next, I sum up these ringtones and hope you can have a little understanding.
1. MID (Musical Instrument Digital Interface MIDI-sequention Sound): MIDI is a language. Just as computers can only understand 0 and 1, MIDI is a language commonly used between electronic musical instruments and related equipment. It is the abbreviation of “Musical Instrument Digital Interface”. It is smf (standard midi) multimedia data format.
2. SPMIDI: almost the same as midi, just adding some control information for its use in mobile phones.
3. MMF/SMAF: SMAF is the abbreviation for Synthetic music Mobile Application Format. It is a multimedia data format developed by Yamaha. MMF (APP Mind Messagement File) is a file of this format, and is a common format for downloading Samsung mobile phones. SMAFdeguige is defined as being able to play multimedia document formats on portable terminals. Compared with similar SMFs (Standard MIDI Documents), SMAF documents have the advantages of small document size and strong expressiveness. Now SMAF is mainly used for the production of ringtones for mobile phones. However, as the SMAF extension specification, it can also be used to display text and graphics. In this way, SMAF provides a space for performance and feasibility when creating multimedia tracks on mobile terminals.
4, RTTTL (Ring Tone Text Transfer Language): RTTTL format is the standard ringtone format, has been supported by many mobile phones.
5, WAV (Wave form Audio): Standard sound file format, with "cd sound quality", but compared with other current compressed format files, occupying too much storage space.
6, WMA (Wingdows Media Audio): Windows Media Audio (wma) file format, it only requires 64kbps encoding rate, you can achieve cd sound quality, the space occupied by the wav, the same content, the digital music file to be reduced half.
7. AMR (Adaptibve Multi-Rate): Nokia's commercial nomenclature for the WB-AMR format (AWB) ring tone has been selected by the 3rd Generation Partnership Project (3rd Generation Partnership Project) for GSM and 3G WCDMA applications. Broadband language compilation standards. AMR is proposed by the European Communications Standardization Committee and is the most widely used voice standard in mobile communication systems. MMS also uses this format as a sound standard.
8, STY (DirectMusic Style): Microsoft has a sound format.
9. IMY (iMelody Ringtone Format): This is a ringtone specially designed for use in EMS. It was proposed by Ericsson in 2000. It was approved by 3GPP as a standard in June 2001. i-Melody ringtones are based on the text-based mode tones. Its standardization work is led by IrDA. Ericsson, which supports EMS, and the current Sony Ericsson mobile phone models use the i-Melody ringtone format.
10, PMD (CMX format): cmx is a technology for cdma network standard. It allows PMD files to contain text, pictures, animations, and sounds. All these elements are integrated in a smaller file that can be transferred between handheld devices. PMD files contain audio and/or video. BREW 2.0 can play mixed audio and video PMD files, BREW 1.0 and 1.1 can only play audio files. Play PMD files on the device for OEM support.
11, mp3: Speaking of mp3, we must first mention MPEG is the abbreviation of the dynamic image expert group. This group of experts was founded in 1988 and is responsible for establishing video and audio compression standards for cd. The MPEG audio file refers to the sound portion of the MPEG standard, namely the MPEG audio layer. MPEG files can be divided into three layers according to the difference in compression quality and coding complexity (MPEG AUDIO LAYER 1/2/3 corresponds to the three sound files mp1, mp2, and mp3, respectively. MPEG audio coding has a high compression ratio. The compression ratios of mp1 and mp2 are 4:1 and 6:1-8:1, respectively, while the compression ratio of mp3 is as high as 10:1-12:1, which means that one minute of CD-quality music requires 10 MB of storage without compression. Space, but after mp3 compression encoding only about 1MB, while its sound quality remains essentially undistorted.Therefore, the most common music format on the Internet is a mp3, mp3 bit to reduce the sound distortion took a coding algorithm called "sensory coding technology" : The audio file is first spectrum-analyzed and then the filter is used to filter out the noise electric frequency. Then the remaining bits are disassembled in a quantized manner to form an mp3 file with a higher compression ratio, and The compressed file can achieve sound effects closer to the original sound source during playback, although it is a lossy compression, but its biggest advantage is a very small sound distortion in exchange for a higher compression ratio.