3.5 Sound


  1. The diaphragm vibrates from the incoming sound.
  2. The vibration is converted to electrical signal by:
    • Condenser Microphone: Uses capacitance change.
    • Piezoelectric: Use the piezoelectric crystal’s vibration.
  3. The analog signal is converted to digital by an analogue-to-digital convertor.


  1. The digital signal is converted to analogue by digital-to-analogue convertor.
  2. The analogue signal (current) flows through a coil suspended in magnetic field. When the current changes, the coil carries the diaphragm vibrates back and forth, generating sound.


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