Audio devices, formats and codecs


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Audio devices, formats and codecs

  1. 1. By Xufeng and Victor
  2. 2. Index  What is a audio devices?  Example of audio input/output devices  What are the codecs?  Loss and Lossless codecs  Sound Formats
  3. 3. What are audio devices?  It is a device that emits or receive sound.There are two types:  Audio Input Devices: Allow a user to send audio signals to a computer for processing, recording, or carrying out commands.  Audio Output Devices: Refers to any device that attaches to a computer for the purpose of playing sound.
  4. 4. Audio Input devices  Input devices: Microphones, digital instruments.
  5. 5. Audio Output Device  Output Device:
  6. 6. What Is a Audio Codecs?  It is a computer program implementing an algorithm that compresses and decompresses digital audio data according to a given audio file format audio format.
  7. 7. Lossless Codec  It is a compressed data that permits the original data to be reconstructed from the compressed data.  Here are some examples: apple lossless audio codec(ALAC), ATRAC Advanced lossless (AAL)
  8. 8. Lossy Codec  It is a data encoding method that compresses data by losing some of it.
  9. 9. Sound Formats  It is a file format that lay up digital audio data on a computer system.  Types of formats:  Uncompressed audio format: It is one major uncompressed audio format.  Formats with lossless compression: It stores data in less space without losing any data.  Lossy compressed audio format: It is a greater reductions in file size by removing some of the data.