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The Chinese telegraph code, Chinese telegraphic code, or Chinese commercial code (simplified Chinese: 中文电码; traditional Chinese: 中文電碼; pinyin: Zhōngwén diànmǎ or simplified Chinese: 中文电报码; traditional Chinese: 中文電報碼; pinyin: Zhōngwén diànbàomǎ) [1] is a four-digit decimal code (character encoding) for electrically telegraphing messages written with ...
The numbers must be looked up at the receiving end making this a slow process, but in the era when telegraph was widely used, skilled Chinese telegraphers could recall many thousands of the common codes from memory. The Chinese telegraph code is still used by law enforcement because it is an unambiguous method of recording Chinese names in non ...
The four-corner method was invented in the 1920s by Wang Yunwu, the editor in chief at Commercial Press Ltd., China.Its original purpose was to aid telegraphers in looking up Chinese telegraph code numbers in use at that time from long lists of characters.
Baudot code / ITA1: 1870 5 bits Piano-like telegraph operation, SIGCUM cipher operation Chinese telegraph code: 1881 4 digits Chinese telegraph communications Murray code: 1901 5 bits Machine run telegraph operation using punched paper, moved optimization from minimal operator fatigue to minimal machinery wear ITA2: 1924 [1] 5 bits
Telegraph (and telex) charged per word sent, so companies which sent large volumes of telegrams developed codes to save money on tolls. Elaborate commercial codes which encoded complete phrases into single words were developed and published as codebooks of thousands of phrases and sentences with corresponding codewords.
A feature of the Baudot code, and subsequent telegraph codes, was that, unlike Morse code, every character has a code of the same length making it more machine friendly. [38] The Baudot code was used on the earliest ticker tape machines (Calahan, 1867), a system for mass distributing information on current price of publicly listed companies. [39]
Chinese government agencies entered characters using a long, complicated list of Chinese telegraph codes, which assigned different numbers to each character. During the early computer era, Chinese characters were categorized by their radicals or Pinyin romanization, but results were less than satisfactory.
Operating signals are a type of brevity code used in operational communication among radio and telegraph operators. For example: Prosigns for Morse code; 92 Code: telegraph brevity codes; Q code: initially developed for commercial radiotelegraph communication and adopted by other radio services; QN Signals: published by the ARRL and used in ...