Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1985-10-01
1988-03-01
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
H03M 512
Patent
active
047289295
ABSTRACT:
A method and apparatus for encoding binary data in which the method includes the steps of converting data words each containing N data bits to channel words each containing M data bits, and producing NRZI code data from the channel words. In the converting step, a data word is not converted in real time when the data word has a specific data bit pattern or when the data word is in a specific relationship to adjacent data words. This unconverted data word is converted to an established channel word which is so determined to reduce the DSV at a time when a predetermined number of data words which are convertible in real time have been inputted or when another data word which should be maintained unconverted has been inputted again. The established channel word is outputted after at least a delay time which is required to convert the unconverted data word to the established channel word.
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IEEE Transactions on Magnetics, vol. MAG-13, No. 5, Sep. 1977, "A New Look-Ahead Code for Increased Data Density", George V. Jacoby, Senior Member IEEE.
Error-Correcting Codes, Second Edition, By W. Wesley Peterson et al., pp. 182-189, 204, 205.
Matsushita Electric - Industrial Co., Ltd.
Sloyan T. J.
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