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Consumer Electronics by S. P. Bali

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NOISE REDUCTION SYSTEMS

The following noise reduction systems are widely used.

  1. Dolby A system
  2. Dolby B system
  3. Philips DNL system
  4. dbx system
  5. Burwen system

Of all the noise reduction systems, the only two which have been applied widely to cassette recorders are the Dolby system and the Philips Dynamic Noise Limiter (DNL) system. The only factor common to them is that they seek to reduce noise particularly in quiet passages of signal where noise is most noticeable, and in the frequency ranges to which the ear is most sensitive. Though the DNL system has some applications in playback of older recordings, the Dolby process, being a double-ended system, is more effective, much more widely used, and likely to be applied to FM stereo transmitters and ...

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