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

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

(a)

Frequency modulated system

(b)

Amplitude Modulated system

(c)

Noise reduction circuit

(d)

Both DC and AC power can be used

Explanation

Dolby B or Dolby C refers to a noise reduction circuit in tape recorders.