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.

Authors: Aizawa, Kohki; Haeno, Akira; Takizawa, Yoshiyuki; Nagashima, Nozomu; Suzuki, Nobuhiro; Yokogawa, Fumihiko
Affiliation: Pioneer Electronic Corporation, Saitama, Japan
AES Convention: 70 (October 1981) Paper Number: 1814
Publication Date: October 1, 1981
Subject: Circuit Design and Development

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