音频图像视频常用格式（Common formats for audio, video, video）.docVIP

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音频图像视频常用格式（Common formats for audio, video, video）.doc

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音频图像视频常用格式（Common formats for audio, video, video） Digital audio format 1: WAV: Microsoft Corp developed a sound format file, also known as waveform sound file, is the earliest digital audio format, the storage space is too large to facilitate the exchange and dissemination. 2 and MIDI: also known as musical instrument digital interface, it is a unified international standard for digital music / electronic synthetic instruments. Some of the instructions stored in the MIDI file are sent to the sound card, which is synthesized by the sound card in accordance with the instructions. 3, CD: the sampling frequency is 44.1KHz, 16 bit quantization bits, like WAV, but the CD storage used tracks form, also called the red book format, record the waveform stream is a lossless format. 4, MP3: the full name is MPEG-1 Audio Layer3, which was incorporated into the MPEG specification in 1992. MP3 can compress digital audio files at high quality and low sampling rate. 5, WMA: Microsoft is in the field of Internet audio, video works. The WMA format is designed to reduce data traffic but maintain sound quality to achieve higher compression rates (up to 1:18). 6, MP4:MP4 compression ratio reached 1:15, the volume is smaller than MP3, but the quality has not declined. 7, DVDAudio: is the new generation of digital audio formats for music formats of DVD discs. 8, MD:Sonys MD (Mini, Disc), stereo music. 9: RealAudio: a file format introduced by RealNetworks company, which can transmit audio information in real time. It is mainly applied to the online play on the network. The main file formats are RA, RM, RMX. 10 and AIFF: Apple Corp developed the sound file format, supported by the Macintosh platform and applications. 11, the sound file format developed by MAC:Apple computers is supported by the Macintosh platform and the Macintosh application, which supports some compression. Two, graphics and images commonly used format 1, BMP: is a device independent image file format, the format of the