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DEVICE FOR MAXIMUM LIKELIHOOD SEQUENCE DISTANCE COMPUTER, DEVICE FOR MAXIMUM LIKELIHOOD SEQUENCE DECODER AND DECODING METHOD
DEVICE FOR MAXIMUM LIKELIHOOD SEQUENCE DISTANCE COMPUTER, DEVICE FOR MAXIMUM LIKELIHOOD SEQUENCE DECODER AND DECODING METHOD
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机译：最大似然序列距离计算机的装置，最大似然序列解码器和解码方法
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摘要
PURPOSE: To provide a computer for maximum likelihood sequence distance used for a sequence decoder that processes a sequence of sampled value from a communication channel or a recorder. ;CONSTITUTION: The distance computer is used by a maximum likelihood decoder where a 2-state trelis is based on a sequence. This includes the duo binary, di-code or partial response class IV signal system. An alive distance with respect to two stages is proportional to a peak level detected by the state. Thus, the peak level is stored by a peak detector 14 till a level of an opposite polarity is detected and a trelis path is converted into an opposite polarity state. A threshold level to convert a path in a state depends on the peak level in the opposite polarity state and a maximum likelihood threshold level. Since only the peak level of a state is stored, an increase in an absolute value of a non- boundary distance is not a problem.;COPYRIGHT: (C)1993,JPO
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