Method and apparatus for encoding and decoding an NRZI digital s

Details Method and apparatus for encoding and decoding an NRZI digital s Method and apparatus for encoding and decoding an NRZI digital s

1984-10-22

1986-12-02

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

358261, 360 39, 360 40, 375 19, H04L 300

Patent

active

046268260

ABSTRACT:
A converted digital signal is provided in an NRZI (non-return to zero, inverted) code with a zero DC component and with a maximum predetermined number of bits between level transitions in the signal. The base digital signal is divided into m-bit base words, each of which is then converted into an n bit converted code word to form a converted digital signal suitable for recording. The n-bit converted code word is selected from a plurality of primary combinations or code words having a DC component substantially equal to zero when NRZI-coded and a plurality of secondary combinations or code words having a DC component with an absolute value of two when NRZI-coded. A variance of the DSV (digital sum variation) of each primary combination when NRZI-coded and a polarity of the DC component of each secondary combination when NRZI-coded are altered in response to the DSV at the exit of the preceding converted digital signal.

REFERENCES:
patent: 4387364 (1983-06-01), Shirota
patent: 4499454 (1985-02-01), Shimada

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