Encoding audio and video

Encoding audio and video

1. Sounds created on a computer exist as digital information encoded as audio files

2. 1. Microphone measures change in air pressure

   • 2. Microphone translates air pressure into electrical voltage
     • 3. Analogue to Digital Converter digitises the electrical voltage to bytes of information
       • 4. Computer displays the digitised sound for manipulation

3. Sound input through a microphone is converted to digital for storage and manipulation

4. Digital sound is broken down into thousands of samples per second. Each sound sample is stored as binary data

5. Digital audio quality

   • sample rate - the number of audio samples captured every second
   • bit rate - the number of bits used per second of audio
   • bit depth - the number of bits available for each clip