2. Audio File Formats
             Common Audio File Formats
                Audio file format   File extension
                   Wave Format           .wav
                    MIDI Format          .mid
                MPEG Audio Format        .mp3
                  Windows Media          .wma
                      Audio
                RealAudio/RealMedia     .ra /.rm
                  Advanced Audio      .mp4 /.m4a
                      Coding
                                   2  Audio File Formats
                                   Wave Format (WAV)
                                     Native audio format in Microsoft Windows
                                     Gives the best audio quality but has the largest audio file size
                                     For example, the file size of four-minute CD-quality stereo recording
                                               40.37 MB
                                                                           Huge file size, not 
                                                                           suitable to use on the 
                                                                           Web
          2  Audio File Formats
          Wave Format (WAV)
                           z
                            oom
                              i
                               ng
               A visual 
           presentation of an 
             audio wave
                                ing
                             oom
                            z
           4.2  Audio File Formats
           MP3
             MPEG-1 Audio Layer-3 (MP3)
             Popular standard for audio compression 
             Supports small file size and high sound quality 
             Compresses storage space by removing inaudible differences 
              in sound signals
               2  Audio File Formats
               MP3
                  Bit rate
                     
                      Determines the audio quality and file size
                     
                      In general, higher bit rate → better audio 
                      quality
                  Quality    Encoding bit    File size
                                 rate
                    CD         128 kbps      2.95 MB
                  FM radio      64 kbps      1.47 MB
                     Audio quality vs file size for an 
                     MP3 file storing a 3-minte song