SU745393A3 - Method of coding and decoding alphanumeric information - Google Patents

Abstract

In CCITT code no. 2, letters and numbers are differentiated by means of a case-shift signal. In order to satisfy the need for an increase in the character set, an additional case-shift signal is implemented by means of the key (3). If the hitherto normal case-shift signal characterises letter-shift signals in lower case, the additional case-shift signal characterises the first following letter-shift signal and only this as a letter-shift signal in upper case. <IMAGE>

Description

I

The invention relates to communication technology and can be used in data transmission systems.

There is a known method for encoding and decoding alphanumeric information using a code, in particular the international code A 2, which determines the sign of the information using the preceding switch character and a separate code mark 1.

However, in this way there is little opportunity to present informational characters without changing the code.

The purpose of the invention is to expand the possibilities of presenting informative characters, for example, changing the character writing without changing the code.

To do this, in the method of encoding and decoding alphanumeric information using a code, in particular the international code W 2, in which the information sign is determined using the preceding switch character and a separate code sign, just before the information sign to be changed, repeat the same the switch character as the previous switch character, and after the preceding sign re2

Key to indicate a lower case letter character The following same switch character characterizes the same capital letter. 6 In FIG. 1 is given a structural electrical circuit of the device implementing the proposed method, the transmitting side; in fig. 2 - the same, the receiving side.

10 The device contains pins 1 and 2 of the keyboard, the elements OR. 3-5, co-, der 6, elements AND 7 and 8, elements OR 9 and 10, trigger 11, decoder 12, trigger ger 13, element AND 14, element OR 15,

16 elements 16 and pin 17.

The device works as follows.

Keypad pin 1 introduces alphabetic characters, and pin 2 enters numbers and punctuation marks. Depending on the closed contact 1.2, the encoder 6 is controlled via the OR 3 element, in which, depending on the respectively closed contact 1, 2, a binary coded character is prepared at the outputs for further transmission.

If contact 1 is pressed for the first time, through the element OR 4, the element

30 and 7 and element OR 9 criterion is given

To form the toggle sign of a single combination to distinguish between letters. The generation of the code combination corresponding to the 6-stroke G sign is slowed down by the delay elements 16 between the OR 3 element and the encoder b. Since the And 7 element is now blocked by the trigger 11 when other contacts 1 are pressed, no other switching code combinations will be entered to designate the letters.

however, pressing one of pins 2 triggers trigger 11 into its second stabilizer and simultaneously generates a switch character to distinguish numbers and punctuation marks through the element OR 5 and the element 8 into the encoder b. The formation of the code combination corresponding to the contact 2 characters occurs as if pressing contact 1 g, which is parallely connected through the corresponding element OR 3,

If pin 17 is pressed, the element OR 10 is accordingly prepared by the switching criterion of the contacts 1, the OR element 10 and the element OR 9 in the encoder 6 generate another uniform switch character, which further designates Letters as capital letters.

The decoder 12 decodes the binary-encoded information signs arriving at the inputs. If decoder 12 recognizes the presence of a switch character characterizing digits or punctuation marks, Tigregg 13 tilts to such a position that the corresponding switching criterion is removed at its exit. Identified in decoder 12 sign Unnumbered for symbols: the buoy delivers switching criteria from output decoder 12 through inverter 18, element OR 15 directly to the favorable line character of letters and in, drives trigger 13 to position in where this criterion is stored in memory and can be removed through the element OR 15. Trigger 13 in this

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In this case, additionally controls the element AND 14, so that other criteria of the same kind supplied by the decoder 12 through the element 14 appear on the output line and are used to switch the printing device from lower case to upper case letters. This switch is valid, however, only for the immediately following alphanumeric character, since the Switching Criterion is not remembered.

Modified with uniform redundant characters, the toggles can be used to distinguish between upper and lower case letters as well; to distinguish regular and italic font.

In the proposed method, the possibility of presenting informational signs is extended.

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Claims (2)

1. Method for encoding and decoding alphanumeric information 5 with the use of a code, in particular international code No. 2, in which the sign of the information is determined with the help of a preceding switch character and a separate code mark, characterized in that The purpose of expanding the possibilities of presenting informational signs, for example, changing and writing a character without changing the code, immediately before the information sign to be changed, repeat the same switching character as the previous switching character. 2. The method according to claim 1 is also distinguished by the fact that after the preceding token of the switch for the symbol of a lowercase letter, the following Such token of the switch characterizes the same capital letter .X, -. 45 Sources of information taken into account in the examination 1. The patent of Germany 903587, cl. 21 d. 11/03, 1954 (prototype).