Which phenomenon is used in audio recording via analog recording and digital recording?

  1. Air pressure changes and voltage changes respectively
  2. Air pressure changes and current changes respectively
  3. Current changes and air pressure changes respectively
  4. Voltage changes and air pressure changes respectively

Answer (Detailed Solution Below)

Option 2 : Air pressure changes and current changes respectively
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Detailed Solution

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CONCEPT:

  • Analog recording: The air pressure changes by the source of the sound. This change at the sound source creates airwaves, which cause a microphone's diaphragm to vibrate. The vibrations convert to an electric current by inducing an electromagnet to imprint a magnetic field on the tape.
  • Digital recording: The first stage of creating a digital recording is the same as analog recording. The vibrations convert to an electric current by inducing an electromagnet to imprint a magnetic field on the tape.

But from that point on, things change. The current changes into strings of zeroes and ones. This is a binary representation of on and off. This is done by an analog to digital converter.

F1 J.K Madhu 19.05.20 D8

EXPLANATION:

  • In analog recording, the sound is recorded by air pressure difference.
  • In digital recording, the sound is recorded by the current difference.

 

So option 2 is correct.

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