The compact cassette has now reached a point in its development at which it deserves serious consideration as a quality music medium. An essential contribution to this improved quality is the use of the Dolby B-type noise reduction system. The cassette duplication process is outlined with particular reference to achievable signal-to-noise ratios, distortion characteristics, high and low frequency equalization, and choice of bias frequencies. A professional Dolby B-type encoder is described, together with its use in the duplicating chain. Standardization and quality control procedures are discussed, and examples are given of B-type encoded cassette identification.
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