The Dolby C-type noise reduction (NR) system was designed to provide 20 dB of noise reduction compared to the 10dB obtained from the present Dolby B-type system. Although the Dolby C-type noise reduction system is much more complex, it was possible to design a single integrated circuit chip to operate in any of 3 modes (NR OFF/B/C) for either encoding (RECORD) or decoding (PLAYBACK) functions. Mode and function selection are accomplished by applying control volumes to only two pins of the standard 28 pin package.
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