Microphones (HT only)

• What is a microphone?

  A device that converts sound waves
• How do microphones convert sound waves?

  They convert sound waves into electrical signals
• What effect do microphones use to induce current?

  The generator effect
• What causes the diaphragm in a moving-coil microphone to vibrate?

  Pressure variations in sound waves
• What are the steps involved in the operation of a moving-coil microphone?

  1. Pressure variations in sound waves cause diaphragm to vibrate.
  2. Vibrations of the diaphragm induce vibrations in the coil.
  3. The coil moves relative to a permanent magnet.
  4. This movement induces a potential difference in the coil.
  5. The induced potential difference generates an electrical signal.
• What is the role of the coil in a moving-coil microphone?

  It moves relative to a permanent magnet
• What does the induced potential difference in the coil cause?

  It generates an electrical signal
• How does the induced potential difference relate to the sound waves?

  It matches the pressure variations in sound waves
• What is the relationship between the diaphragm's vibrations and the electrical signals in a microphone?

  • Diaphragm vibrations cause coil movement.
  • Coil movement induces electrical signals.
  • Electrical signals correspond to sound wave pressure variations.
• What do the electrical signals generated by a microphone correspond to?

  Pressure variations in sound waves
• Why is the diaphragm important in a microphone?

  It converts sound pressure into mechanical vibrations
• What happens to the electrical signals when sound waves change?

  They change in accordance with sound wave variations
• How does the microphone's design affect its function?

  Design influences sensitivity and frequency response