Baudot code

Abstract: A telecommunication device for the deaf (12, 14, 16, 20, 22, 24, 26, 28) operates under conventional Baudot communication protocol, but has enhanced features enabling it to handle interrupts either from a conventional or a similar TDD The improved TDD is also capable of pseudo-duplex communication with a similar TDD in which each device transmits packets of characters alternatively to the other thus making it appear to the users that simultaneous transmission is occuring The implementation of these features is done in such a way that the TDD is fully capable of communication with existing TDD devices and the device obeys normal rules and conventions for Baudot communication

Abstract: A data terminal has a keyboard capable of encoding data. A switch determines whether a diode matrix will encode keyboard entries in Baudot or ASCII code. A modem couples the encoded keyboard data to telephone lines for transmission to another terminal station. Data may be received by the terminal in either Baudot or ASCII code. The received data is translated to alphanumeric video signals that may be displayed on a conventional television receiver.

Abstract: This paper describes the Creed, Murray Automatic, Siemens & Halske, Baudot and American Multiplex Printing Telegraph Systems, and their methods of operation. A discussion of the operating features of the systems described is dealt with under the following headings:? Accuracy Under this heading it is shown that printing systems are more accurate than Morse working and that the printing system which permits of sufficient time for checking of messages is likely to be the most accurate. Speed of Service. It is shown wherein the multiplex systems are superior to the high-speed systems. Operator Output. Under this heading reference is made to actual results, both at home and abroad. Maintenance. Outlines method proposed for detecting incipient faults in apparatus and securing uninterrupted service. Line Economies. The advantages of using the five-unit code are discussed. Flexibility. Examples are given of the flexibility of multiplex systems in linking up a number of cities, by means of forking repeaters, thereby resulting in either line or operator economies.

Abstract: A method and apparatus for coding, transmitting, receiving, and displaying remotely or locally, all Arabic-Farsi characters or letters, basic arithmetic signs, numerals, punctuation marks and diacritical marks, as well as teleprinter operation commands in 5-bit standard Baudot codes. An Arabic-Farsi teleprinter similar in operation to the English teleprinter and compatible with the International exchange systems is provided without eliminating any letter forms. The teleprinter operation (the ability to compress the data into 5-bit characters) is based upon two basic criteria of the Arabic-Farsi languages, namely: (1) the form (start, middle, end or independent) of a character can be known if the preceding character and the following characters are known; and (2) there are six characters that are identical except for the presence or absence of a dot. The digital logic circuits make use of the above criteria to permit the encoding and decoding and thus the transmitting and receiving of complete Arabic-Farsi alphabets. A particular grouping of characters with level coder for each grouping, as well as a keyboard arrangement and control circuits for more versatile use of input/output devices are also disclosed.