Telegraph code in the context of Optical telegraph

Telegraph code in the context of Optical telegraph

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⭐ Core Definition: Telegraph code

A telegraph code is one of the character encodings used to transmit information by telegraphy. Morse code is the best-known such code. Telegraphy usually refers to the electrical telegraph, but telegraph systems using the optical telegraph were in use before that. A code consists of a number of code points, each corresponding to a letter of the alphabet, a numeral, or some other character. In codes intended for machines rather than humans, code points for control characters, such as carriage return, are required to control the operation of the mechanism. Each code point is made up of a number of elements arranged in a unique way for that character. There are usually two types of element (a binary code), but more element types were employed in some codes not intended for machines. For instance, American Morse code had about five elements, rather than the two (dot and dash) of International Morse Code.

Codes meant for human interpretation were designed so that the characters that occurred most often had the fewest elements in the corresponding code point. For instance, Morse code for E, the most common letter in English, is a single dot ( ▄ ), whereas Q is  ▄▄▄ ▄▄▄ ▄ ▄▄▄ . These arrangements meant the message could be sent more quickly and it would take longer for the operator to become fatigued. Telegraphs were always operated by humans until late in the 19th century. When automated telegraph messages came in, codes with variable-length code points were inconvenient for machine design of the period. Instead, codes with a fixed length were used. The first of these was the Baudot code, a five-bit code. Baudot has only enough code points to print in upper case. Later codes had more bits (ASCII has seven) so that both upper and lower case could be printed. Beyond the telegraph age, modern computers require a very large number of code points (Unicode has 21 bits) so that multiple languages and alphabets (character sets) can be handled without having to change the character encoding. Modern computers can easily handle variable-length codes such as UTF-8 and UTF-16 which have now become ubiquitous.

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Telegraph code in the context of Hanzi

Chinese characters, also known as Han characters, Chinese script or Hanzi, are logographs used to write the Chinese languages and other Far Eastern languages from regions historically influenced by Chinese culture such as Japanese, Korean and (pre-colonial) Vietnamese. Unlike letters in the alphabets of most languages, which only transcribe the phonetics (phonemes) of speech (i.e. are phonegraphs), Chinese characters generally represent morphemes, the basic units of meaning in a language, thus making them the linguistic equivalent of words rather than letters, while the majority of "words" in the Chinese lexicon are in fact compounds and phrasemes (short phrases). The pronunciation of Chinese characters is transcribed phonetically via separate (usually romanized) transliteration systems such as the Pinyin, Zhuyin, Jyutping, Wade–Giles or Yale system.

At the most basic level, Chinese characters are composed of strokes (the actual linguistic equivalent of letters), which are written in a fixed stroke order for each character. The strokes are then organized into radicals, which are the fundamental root components that represent either a semantic feature or a homophone (often based on the Middle Chinese pronunciations) of the character. Historically, methods of writing characters have included carving inscriptions on stone, animal bones (usually turtle shells) or bronze; drawing ink onto bamboo slips, fabric (typically silk) or paper; and printing with woodblocks or moveable type. Technologies invented since the 19th century to facilitate the use of characters include telegraph codes and typewriters, as well as input methods and text encodings on computers.

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Character encoding → Information → Telegraphy → Morse code → Electrical telegraph → Optical telegraph → Code point → Control character → Carriage return → American Morse code → International Morse Code → Variable-width encoding → Baudot code → Bit → Upper case → ASCII → Unicode → Character set → UTF-8 → UTF-16 →