Classic Wave
Wave files as the most classic Windows multimedia audio format, is very wide, it uses three parameters to represent sound: sampling bits, sampling frequencies and channels.
The channels have mono and stereo points, and the sampling frequency is generally 11025 Hz (11kHz), 22050 Hz (22kHz) and 44100 Hz (44kHz). The capacity of the Wave file = (sampling frequency × sampling bits × channel) × time / 8 (1 byte = 8bit).
Traditional MOD
MOD is a similar wave form pattern, but its structure is similar to MIDI, using real sampling, small size, in the previous DOS era, MOD is often used as a game background music. The current MOD can contain a lot of tracks, and there are many formats, such as S3M, NST, 669, MTM, XM, IT, XT, and RT.
Computer music MIDI
MIDI is the abbreviation of the Musical Instrument Data Interface, which records the sound played by the instrument (each note is recorded as a number), then, when playback, the record is synthesized by FM or wavelert: FM synthesis is The sound of the instrument is simulated by a plurality of frequencies of sound; the wave form synthesis is to store the sound sample of the instrument in the sound card waveform table, and the sound is taken out from the waveform table when played.
Faucet boss MP3
MP3 can be described as a great name, which uses MPEG Audio Layer 3 technology to compress the sound with 1:10 or even 1: 12 compression ratio, the sampling rate is 44kHz, the bit rate is 112kbit / s.
MP3 music is a digitally stored music. If you want to play, you must have the corresponding digital decoding playback system, which is generally decoded by MP3 digital music by dedicated software, and then restores the waveform sound signal playback output, this software is called For the MP3 player, such as WinAmp, etc.
Online overlord RA series
RA, RAM and RM are REAL's mature network audio format, which uses "audio stream" technology, so it is very suitable for webcasts. At the time of production, you can add copyright, singer, MAIL and song Title and other information.
RA can be called the overlord of multimedia propagation on the Internet, suitable for real-time playback on the network, is currently online listening to network music best format.
High compression ratio VQF
VQF, TWINVQ is an audio compression technology developed by Nippon Telegraph and Telephone with Yamaha.
The audio compression ratio of VQF is nearly doubled than the standard MPEG audio compression ratio, which can reach about 1:18 or even higher. And like MP3, RA is widely popular in a popular compression format, generally only about 1:12. But still does not affect the sound quality, when VQF compresses the music at 44kHz-80kbit / s audio sampling rate, its sound quality will be better than the MP3 of 44kHz-128kbit / s, compressed at 44kHz-96kbit / s, the music is close to 44kHz- MP3 of 256kbit / s.
Mini CD MD
MD (ie MINIDISC) is a complete portable music format launched in 1992, which is the compression algorithm it uses is ATRAC technology (1: 5 compression ratio). MD is also divided into recording MD (Recordable, two heads with magnetic head and laser head) and single MD (pre-recorded, only laser head).
The powerful editing function is MD strength, can quickly select, track movement, merge, split, delete, and tame editing, more personalized than CD, and you can have a MD album that belongs to your own MD album. MD products include MD Walkman, MD bed audio, MD car audio, MD recording card, MD camera and MD driver. Music CD
That is, a CD record, a CD can play a voice file for about 74 minutes, and a CD player is brought in the Windows system. In addition, the software included with the multi-sound card provides a CD playback function, and even some optical drives are separated from the computer, as long as the connection The power supply can be used as a separate CD player.
Unlimited WMA
Microsoft has pushed ASF (Audio Steaming Format on the development of its own network multimedia service platform, which is a standard for data transfer supporting data on a wide variety of networks and protocols. It supports audio, video, and other series of multimedia types. WMA is the abbreviation of Windows Media Audio, which is equivalent to only ASF files that contain audio.
The WMA file is compressed in 80kbps, 44kHz mode, which is 1: 18, basically, and VQF. Moreover, the compression speed is doubled than MP3. So it should be more competitive than VQF.
Free music format Vorbis
In order to prevent the patent costs charged by MP3 Music, GMGi's ICAST has developed a new free music format Vorbis, which is comparable to MP3, even more than MP3. And will be released through the network, you can freely download freely, don't worry that it will involve infringement. But MP3 is very popular online, Microsoft's Windows Media technology has also begun to popularize, and Vorbis's prospects are still not optimistic.
Other audio format
AIF / AIFF: A sound file format developed by Apple, supports the Mac platform, supports 16-bit 44.1khz stereo.
AU: Sun's AU compressed sound file format, only 8-bit sounds, is the sound file format commonly used on the interconnection, and is created by the Sun workstation.
CDA: CD track file.
CMF: Creative developed a sound file similar to MIDI.
DSP: Digital Signal Processing Abbreviation. By increasing the signal processing method, the sound quality will greatly improve, and the song will be more pleasant.
S3U: MP3 play file list
RMI: MIDI instrument sequence
Lossless compression:
AAC: The sound quality is second only to MPC at the high bit rate, and it is very good at high bit rate and low bit rate. Is the coding speed is too slow!
MPC: The low bit rate is generally general, the MP3PRO encoded MP3 and OGG, the high bit rate is best, the coding speed is fast!
OGG: The low bit rate is best, the high bit rate is also good. The encoding speed is slightly slow.
MP3 (MP3PRO): The sound quality at low bit rate is in OGG, other aspects are mp3
WMA: High and low bit rate is general, do not support VBR, up to 192kbit / s
lossless compression:
FLAC: The compression ratio is the worst in four, the encoding speed is good, the platform is supported very well.
PAC: Somety slow coding speed, third compression ratio, the platform supports good.
APE: The fastest encoding speed, the best compression ratio, the platform supports.
WV: The coding speed is very fast, the compression ratio is second, and only the Windows platform is supported.
