US 4,728,929 AGranted

Method and apparatus for encoding binary data

AssigneeMatsushita Electric Industrial Co., Ltd.

InventorShinichi Tanaka

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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.

Claims11

Dependent claims

An apparatus for encoding binary data comprising:

a converting means for converting binary data words each containing N data bits (wherein N is an integer larger than (1) to binary channel words each containing M data bits (wherein M is an integer larger than N);
and an NRZI modulating means for modulating said channel words into NRZI coded channel codes,
wherein said converting means holds a specific data word which satisfies at least one of a condition that the specific data word has a specific bit pattern and a condition that the specific data word has a specific relationship to adjacent data words;
converts said held specific data word to an established channel word so that absolute value of digital sum variation of previously encoded binary data is reduced when another specific data word which satisfies at least one of said conditions has been inputted;
and outputs said established channel word after at least a delay time required to convert said held specific data word to said established channel word, and
wherein, if a predetermined number of data words which are convertible to channel words in real time have been inputted before said another specific data word is inputted, said converting means converts said held specific data to said established channel word so that absolute value of digital sum variation of previously encoded binary data is reduced when said predetermined number of data words have been inputted.

3 more elements

A method for encoding binary data into NRZI codes comprising the steps of:

converting binary data words each containing N data bits (wherein N is an integer larger than 1) into binary channel words each containing M data bits (wherein M is an integer larger than N);
and NRZI modulating said channel words into NRZI coded channel codes,
wherein said converting step comprises the steps of:
holding a specific data word which satisfies at least one of a condition that the specific data word has a specific bit pattern and a condition that the specific data word has a specific relationship to adjacent data words;
converting said held specific data word to an established channel word so that absolute value of digital sum variation of previously encoded binary data is reduced when another specific data word which satisfies at least one of said conditions has been inputted;
and
outputting said established channel word after at least a delay time required to convert said held specific data word to said established channel word, and
wherein, if a predetermined number of data words which are convertible to channel words in real time have been inputted before said another specific data word is inputted, said step of converting said held specific data converts said held specific data to said established channel word so that absolute value of digital sum variation of previously encoded binary data is reduced when said predetermined number of data words have been inputted.

5 more elements

Dependencies are inferred from the claim text.