COMPUTER SCIENCE presentation o levels .pptx

computer science

1. COMPUTER SCIENCE Project by: Dua , Ibrahim Qazmi , Minhal , Sunesh and Arsalan

2. MIDI FILES Musical Instrument Digital Interface (MIDI) Is essentially a communications protocol that allows electronic musical instruments to interact with each other. A MIDI file consists of a list of commands that instruct a device ( e.g , an electronic organ)how to produce a particular musical note or sound. Each MIDI command has a specific sequence of bytes. The first being the status byte, this informs which function to perform, then two other bytes are required. A Pitch Byte , which tells the MIDI device which note to play and Velocity Byte , which tells the device how loud to play the note. MIDI messages are saved in a file which is recognized by the file extension .mid. As they don’t contain any audio track their size is much smaller than a MP3 file.

3. Lossy files L ossy compression reduces a file by permanently eliminating certain information, especially redundant information. When the file is uncompressed, only a part of the original information is still there (although the user may not notice it). Lossy compression is generally used for video and sound, where a certain amount of information loss will not be detected by most users. The JPEG image file, commonly used for photographs and other complex still images on the Web, is an image that has lossy compression.

4. Lossless Files With lossless compression, every single bit of data that was originally in the file remains after the file is uncompressed. All of the information is completely restored. This is generally the technique of choice for text or spreadsheet files, where losing words or financial data could pose a problem. The Graphics Interchange File (GIF) is an image format used on the Web that provides lossless compression.

5. Thank You