UPSC Prelims 2006·GS1·science-and-technology·science and technology

What does the term. Dolby B, or Dolby C. printed on tape recorders and other sound system refer to?

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Last updated 8 Jul 2026, 4:39 pm IST
  1. AFrequency modulated system
  2. BAmplitude Modulated system
  3. CNoise reduction circuitCorrect
  4. DBoth DC and AC power can be used

Explanation

The correct answer is C because Dolby B and Dolby C are specific types of noise reduction systems developed by Dolby Laboratories for magnetic tape recordings.

In tape recording, a common problem is tape hiss, which is a high frequency background noise. Dolby B and Dolby C work by compressing the dynamic range of the audio signal during recording and expanding it during playback. This process effectively reduces the audible level of background hiss without distorting the original sound, resulting in a clearer audio output. These circuits became industry standards for improving the sound quality of cassette tapes and high fidelity sound systems.

science-and-technology: What does the term. Dolby B, or Dolby C. printed on tape recorders and other sound system refer to?
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