noise reduction

2-04 - elektor february 1981 noise reduction noise silence is golden reductioncourse the Dolby B system which fitted the bill very nicely. Philips, the inven- tors of the cassette itself, followed up shortly after with their DNL (Dynamic Noise Limiter). It was not too difficult to see which of the two in existence would be suitable for home construc- tion. On the one hand, the Dolby B system was fairly complicated, requiring a great deal of skill and calibration on the part of the builder (even if the ICs were available). On the other hand, the Philips DNL was not as effective as the Dolby but was very much simpler and was offered free to the world ... no licences required. This of course pre- sented a far better prospect to the home Noise reduction systems, the electronic kind, have been in the news off and on for about ten years, since the compact cassette became popular in fact. Technology moves on however and recent developments in this field have resulted in new and improve...