Conference Paper

Sequence estimation algorithms for the digital compact cassette

Authors:
  • Google Inc., New York, United States
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Abstract

Two sequence estimation algorithms for use in the digital compact cassette (DCC) system are investigated. Their performance is determined by means of a computer simulation. Experimental data is analysed. In the DCC system, a binary 8-to-10 modulation (ETM) code is used. The ETM code is a running digital sum (RDS) constrained code. A fully-fledged Viterbi algorithm, realizing maximum likelihood sequence estimation, and a suboptimal Viterbi algorithm, based on the RDS trellis are considered

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Article
The design philosophy of the DCC is described. The DCC system is a digital extension of the well-known compact cassette system. The main differences are: highly efficient source coding of the audio signal, called precision adaptive subband coding (PASC), resulting in excellent sound quality; digital multitrack recording, including error correction techniques; thin film techniques for head production; autoreverse feature in all players; and new features (e.g., text display). The system performance, the cassette, the tape format, and the PASC are discussed