Music format Overview

Music format Overview
Classic Wave
As the most classic windows multimedia audio format, the wave file is widely used. It uses three parameters to represent the sound: the number of sampling digits, the sampling frequency, and the number of audio channels.
Channels are classified into single-channel and stereo sound. Generally, the sampling frequency is 11025Hz (11 kHz), 22050Hz (22 kHz), and 44100Hz (44 kHz. Capacity occupied by the wave file = (sampling frequency × number of sampling digits × channel) × time/8 (1 byte = 8 bit ).
Traditional mod
MoD is a music format similar to a wave table, but its structure is similar to Midi. It uses real sampling and has a small size. In the past dos Years, moD is often used as background music for games. The current mod can contain many audio tracks and many formats, such as s3m, NST, 669, MTM, XM, IT, XT, and RT.

Computer music MIDI
MIDI is short for the musical instrument data interface. It records the sound played by the instrument in numbers (each note is recorded as a number). Then, these records are then synthesized through FM or wave table during playback: FM synthesis simulates the sound of an instrument by mixing Multiple Frequencies of sound; wave table synthesis stores the sound samples of the instrument in the sound card waveform table, and extracts the sound from the waveform table during playback.

Leader MP3
MP3 is well-known. It uses MPEG audio Layer 3 technology to compress the sound with a compression rate of or even. The sampling rate is 44 kHz and the bit rate is 112 kbit/s.
MP3 music is stored as a digital music. If you want to play it, you must have a corresponding Digital decoding and Playback System. Generally, you can use special software to decode mp3 digital music, it is then restored to the playback output of the waveform sound signal. This software is called an MP3 player, such as Winamp.

Online overlord Ra Series
Ra, ram, and RM are both mature network audio formats of real. They use the "audio stream" technology, so they are very suitable for network broadcast. You can add information such as copyright, artist, producer, mail, and song title during production.
RA can be called the dominant multimedia communication on the Internet and is suitable for real-time playing on the network. It is currently the best online music format.

Vqf with high compression ratio
Vqf, that is, twinvq, is an audio compression technology developed by the same company as Yamaha, and is developed by Nippon Telegraph and Telephone.
The audio compression ratio of vqf is nearly twice higher than that of standard MPEG audio, and can reach around or even higher. Popular compression formats such as MP3 and Ra are generally around. However, it still does not affect the sound quality. When vqf compresses music at the 44khz-80kbit/s audio sampling rate, the sound quality of vqf is better than that of 44khz-128kbit/s MP3 and is compressed with 44khz-96kbit/s, music is close to 44khz-256kbit/s MP3.
Mini-CD MD
MD (minidisc) is a complete portable music format launched by Sony in 1992. It adopts the ATRAC technology (the compression ratio is ). MD is also divided into recordable MD (with head and laser head) and single-release MD (pre-recorded, with only laser head ).
The powerful editing function is the strength of MD. It can quickly select music, track movement, merge, split, delete, and edit music names. It is more personalized than CD, you can have your own Md album at any time. MD products include MD Walkman, MD bedside audio, MD car audio, MD Recording Card Holder, MD Camera gun and MD drive.

Music CD
That is, CD records. a cd can play a sound file of about 74 minutes. a cd player is provided in windows. In addition, most software attached to the sound card provides the CD playback function, even some optical drives can be used as an independent CD player as long as they are powered on.

Unlimited Potential WMA
Microsoft has developed its own network multimedia service platform to promote ASF (audio steaming format). This is an open standard that supports data transmission on a variety of networks and protocols. It supports audio, video, and a series of other multimedia types. WMA is short for Windows Media Audio, which is equivalent to an ASF file that only contains audio.
The compression ratio of WMA files in 80 kbps and 44 kHz mode is, basically the same as that of vqf. In addition, the compression speed is doubled than that of MP3. Therefore, it should be more competitive than vqf.

Free music format Vorbis
To prevent MP3 music companies from charging more patent fees, icast programmers of gmgi developed a new free music format Vorbis, with sound quality comparable to or even better than MP3. It will be released through the Internet and can be freely downloaded for free without worrying about infringement issues. However, MP3 has become very popular on the Internet and Microsoft's Windows Media Technology has begun to become popular. The prospect of Vorbis is still not optimistic.

Other audio formats
AIF/AIFF: a sound file format developed by Apple. It supports Mac platforms and 16-bit 44.1khz stereo.
AU: Sun's au compressed audio file format, which only supports 8-bit sound. It is a commonly used audio file format on the Internet and is mostly created by SUN workstation.
CDA: a cd audio track file.
CMF: a midi-like audio file developed by creative.
DSP: Short for digital signal processing (Digital Signal Processing. By improving the signal processing method, the sound quality will be greatly improved, and the songs will be more pleasant.
S3u: MP3 playback file list
RMI: sequence of MIDI instruments

Lossy compression:
AAC: the sound quality at high bit rates is second only to that at mcm, And the appearance at high bit rates and low bit rates is quite good. That is, the encoding speed is too slow!
MCM: the performance is average at low bit rate, which is less than that of MP3 and Ogg encoded by mp3pro. The sound quality is the best at high bit rate and the encoding speed is faster!
Ogg: the best sound quality at low bit rates. The same is true for high bit rates. The encoding speed is slow.
Mp3pro
WMA: generally used at high/low bit rates. VBR is not supported and the maximum bit rate is 192 kbit/s.

Lossless compression:
FLAC: the compression ratio is the worst among the four, the encoding speed is good, and the platform supports well.
PAC: the encoding speed is slightly slow, and the compression rate is ranked third. The platform supports well.
APE: the fastest encoding speed and the best compression rate, which is generally supported by the platform.
WV: the encoding speed is very fast, and the compression ratio is ranked second in four categories. Only Windows platforms are supported.