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

m (1) Frequency Modulated System

m (2) Amplitude Modulated System

m (3) Noise Reduction Circuit

m (4) Both DC and AC power can be used Ans. (3)

Exp. The term Dolby B or Dolby C printed on tape-recorders and other sound systems refers to Noise Reduction Circuit. Dolby is a company which has developed this Noise Reduction Circuit.

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