1, WAV format
WAV format, also known as waveform sound file, is the earliest digital audio format, which is widely supported by Windows platform and its applications. WAV format supports various compression algorithms, various audio bits, sampling frequencies and channels, and adopts sampling frequencies of 44, 1kHz and quantization bits of 16 bits. Like CD, it needs too much storage space to communicate and spread.
2.MIDI format
MIDI is the abbreviation of musical instrument digital interface, also known as musical instrument digital interface. MIDI is a unified international standard for digital music/electronic synthetic instruments, which can simulate the sounds of various instruments. MIDI files are files in MIDI format, and some instructions are stored in MIDI files. Send these instructions to the sound card, and the sound card will synthesize sound according to the instructions.
3.CDA format
CDA format, whose sampling frequency is 44, 1kHz, 16 quantized bits, is the same as WAV, but CD is stored in the form of audio track, also called "red book" format, which records waveform stream, which is an approximate lossless format.
4.MP3 format
MP3 can compress digital audio files with high quality and low sampling rate. In other words, audio files (mainly large files, such as WAV files) can be compressed to a smaller extent, and the loss of sound quality is very small (the human ear simply does not notice this loss of sound quality).
5.MP3Pro format
MP3Pro format can improve the original sound quality of MP3 music without changing the file size. It can compress audio files at a lower bit rate and maintain the sound quality before compression to the greatest extent.
6.WMA format
WMA format aims to achieve a higher compression rate by reducing data traffic but maintaining sound quality, and its compression rate can generally reach 1: 18. In addition, WMA can also add anti-copy function through DRM (Digital Rights Management) scheme, or add restrictions on playing time and times, even playing machines, which can effectively prevent piracy.
7.MP4 format
MP4 adopts the encoding technology of file copyright protection, which can only be played by specific users, effectively ensuring the legitimacy of music copyright. In addition, the compression ratio of MP4 reaches 1: 15, which is smaller than that of MP3, but the sound quality has not decreased. However, because only specific users can play such files, their circulation is far from that of MP3.
8.SACD format
The sampling rate of SACD format is 64 times that of CD format, that is, 2.8224MHz, and the playing frequency bandwidth of SACD is 100kHz, which is 5 times that of CD format. The 24-bit quantization digit far exceeds that of CD, and the sound details are richer and clearer.
9.QuickTime format
QuickTime is a digital streaming media launched by Apple at 199 1 It is oriented to video editing, website creation and media technology platform. QuickTime supports almost all mainstream personal computing platforms and can provide real-time digital information flow, workflow and file playback functions through the Internet.
10, other formats
Common file sound formats also include: VQF format, DVD audio format, MD(MiniDisc) format, RealAudio format, Liquid Audio format, VOC file format, AU format, OGG format, AIFF format and so on.
Extended data
Because of the difference of sound file formats, many sound files with different formats can't be opened sometimes, so it is necessary to convert the sound format. Taking Cool Dog Software as an example, the voice format conversion operation is as follows.
1. Open the homepage of Cool Dog Music, and click the toolbar with four small squares in the top row to open more application options;
2. In the toolbar, find and click Format Conversion, and the tool will be automatically downloaded to the mobile phone or computer;
3. After downloading and installing the format conversion tool, the system will pop up a window, click I know or don't prompt again next time.
4. When selecting the target folder, click the change or open folder option to find the target file;
5. On this page, select the required format, and then click Start Conversion to complete the conversion of sound format.
Baidu encyclopedia-sound format