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

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Q: 21 (IAS/2006)
What does the term ‘Dolby B’ or ‘Dolby C’ printed on tape recorders and other sound systems refer to?

question_subject: 

Science

question_exam: 

IAS

stats: 

0,28,47,16,22,28,9

keywords: 

{'other sound systems': [0, 0, 1, 0], 'tape recorders': [0, 0, 1, 0], 'noise reduction circuit': [0, 0, 1, 0], 'frequency': [0, 0, 1, 3], 'modulated system': [0, 0, 1, 0], 'system': [8, 3, 7, 23], 'term': [28, 1, 9, 27], 'ac power': [0, 0, 1, 0], 'amplitude': [1, 0, 7, 8]}

The term `Dolby B` or `Dolby C` printed on tape recorders and other sound systems refers to types of noise reduction systems. This is linked with option 3, which indicates a noise reduction circuit.

Option 1, frequency modulated system, and option 2, amplitude modulated system, both refer to methods used to encode information on a carrier wave for transmission, commonly used in radio broadcasting. They are not specific to noise reduction in sound systems.

Option 4 suggests both DC and AC power can be used. While it`s a fact that many electronic devices can use both sources of power, it has no relation to `Dolby B` and `Dolby C`. These phrases specifically denote noise reduction technologies and not power sources.

So, option 3 is the correct answer: `Dolby B` and `Dolby C` are indeed a type of noise reduction circuit technology, designed to improve the sound quality of audio systems.