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Signal Processing of the Compact-Cassette Digital Recorder
The signal-processing techniques for compact-cassette digital recording are of interest to those concerned with consumer audio equipment. A cassette digital tape recorder using a metal-evaporated tape has been developed together with a high-density ferrite head having 12 tracks of 120-µm track width and 0.3 µm gap length per channel. Specially designed digital signal-processing circuits include circuits for signal generation, modulation, error correction, and signal control. The digital modulation scheme called FEM-4 is a new and key item of the design. The practical design and system concepts are outlined.
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