Method and apparatus for converting data in a binary format

Details Method and apparatus for converting data in a binary format Method and apparatus for converting data in a binary format

1987-06-05

1988-12-06

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

H03M 700

Patent

active

047898526

ABSTRACT:
A method and apparatus for converting data in a pure binary format into a format that is transparent to a data handling system that utilizes the International Telegraphers Alphabet No. 5 (ITA 5), or the American subset thereof, the American Standard Code for Information Exchange (ASCII). The apparatus according to a specific embodiment of the present invention includes a 4 byte input register that has a parallel output, a 5 byte output register that has a parallel input and encode logic connected between the two registers. The input logic either directly connects or maps the output from the bits of the input bytes to corresponding positions in the bits of the first four output bytes, converts the data of other bits in the input bytes, or maps the bits of the input bytes into the 5th byte of the output word.
The Method according to a specific embodiment of the present invention encodes data in an 8 bit byte of pure binary into the 7 bit code of the ASCII format such that only printable, and hence transparent ASCII characters are produced. The method generates five 8 bit bytes of code for every four 8 bit bytes of data by mapping the parity bits of the data into the 5th byte, testing bit positions 6 and 7 of each byte to ascertain whether they are both zeros and if so setting and mapping an indicator bit into the 5th byte for every pair of tested bytes and inverting those bits and swapping 1 bit of each of the two bytes, and then storing the manipulated bits in corresponding locations in the output word, and then finally setting the value of one or both bits 6 and 7 in the 5th byte of the output word to ensure the 5th byte is not a control character.

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