Compact cassette
Compact cassette A neatly packaged magnetic tape recording and playback system for audio introduced in the 1960s. Uses a narrow plastic tape with four tracks running at a speed of 28.6mm/s (1 and 1/8 inches per second). While initially very low in fidelity, in the early 1970s tremendous advances were made in tape formulations, first with Chromium Dioxide magnetic materials and then later with 'Metal' tapes, which extended the high frequency response and improved their saturation characteristics. The addition of Dolby B noise reduction (and later Dolby C) reduced the inherent problem of high noise levels due to the low tape speed.
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