Apparatus, method and algorithm for encoding and decoding charac

Details Apparatus, method and algorithm for encoding and decoding charac Apparatus, method and algorithm for encoding and decoding charac

1986-03-10

1988-06-21

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

178 2B, 178113, H03M 700

Patent

active

047527650

ABSTRACT:
A first data processing system sends a message to a second data processing system via a modem. A processor of the first data processing system executes the instructions of an encoding algorithm stored in a memory of the first data processing system thereby encoding the characters of the message as the message is sent from the first system to the second system. The processor, in conjunction with the encoding algorithm, encodes the characters of the message by locating unacceptable characters among the acceptable characters in the message, the unacceptable characters possessing more than one meaning and triggering the execution of a function other than the intended function. The acceptable characters do not possess any alternative meanings. A bias code is selected for the acceptable characters and a further bias code is selected for the unacceptable characters. The unacceptable characters are converted into modified acceptable characters. The bias code, acceptable characters, further bias code, and modified acceptable characters are transmitted from the first data processing system to the second data processing system. The second system interprets the bias code to mean that the acceptable characters should be accepted without alteration, but interprets the further bias code to mean that the modified acceptale characters should be re-converted into the original unacceptable characters. Since the second system received the unacceptable characters in modified acceptable character form, only the intended function of the character will be executed.

REFERENCES:
patent: 4649231 (1987-03-01), Marbet

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