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what does the term dolby b or dolby c printed on tape-recorders and other sound systems refer to

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Q.

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

[A] noise reduction circuit

[B] frequency modulated system

[C] amplitude modulated system

[D] both DC and AC power can be used

Answer & Explanation
Option: [A]

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