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[PPDM] Audio - Coggle Diagram

- - - - also known as sampling
      - audio conversion to digital signal
  - - - sample to sample matching
      - average amplitude matching (better)
- - - - represented in normal wave diagram
      - the middle line pierces the mid of the wave
      - sine wave
    - - average energy
      - zero crossing rate
      - silence ratio
      - subjective feature
        
        timbre
        
        pattern in audio
  - - - represented in spikes of audio
      - audio spectrum from YouTube
    - - bandwidth
      - energy distribution
      - harmonicity
      - pitch
        
        higher pitch -> spongebob voice
- - - - higher bandwidth
      - lower silence ratio
      - regular beats / timbre
    - - lower bandwidth
      - higher silence ratio
      - unique / irregular beats
  - - - features eliminated individually
      - if-else fashion
    - - features eliminated as vector-like tupples