UPSC Prelims PYQ 2006: What do Dolby B and Dolby C indicate?
What does the term ‘Dolby B’ or ‘Dolby C’ printed on tape recorders and other sound systems refer to?
- Frequency modulated system
- Amplitude modulated system
- Noise reduction circuit
- Both DC and AC power can be used
Explanation
Option (c) is correct
- Dolby B and Dolby C are audio noise-reduction systems developed by Dolby Laboratories for analog tape recording and playback. These systems reduce background hiss and unwanted noise commonly associated with magnetic tape recordings, thereby improving sound quality and clarity. Dolby C provides a higher level of noise reduction than Dolby B. Therefore, the terms “Dolby B” and “Dolby C” refer to noise reduction circuits used in audio equipment.
Answer: (c) Noise reduction circuit
