![]() They are short sounds, which is appropriate for most purposes. These have an obvious (but not necessarily direct) mapping to their phonetic values in written text. Letters of the Latin alphabet have common, onomatopoeic names, 'Ay', 'Bee', 'Sea' etc. Nevertheless, I hope readers find it interesting and useful. I cannot be bothered to click much further than Wikipedia for references, for instance. I could write this paper to a publishable standard – and then perhaps try to get it published. The paper investigates a number of spelling alphabets, with particular interest in the Nato 2 Phonetic Alphabet, which is the international standard for this purpose. The approach taken has been to convert the words into a phonetic form and then to measure the degree of difference between each of the pairs of words. This paper concentrates on property (1), above.Ĭan we measure how well different letters can be distinguished? They should be easy to remember, with an obvious mapping to the letter they represent. longer than the monosyllabic 'Ay Bee Sea'), but not so long as to slow down the communication any more than necessary. The words should be audibly as different from each other as possible. There are a number of properties that are desirable in a spelling alphabet, including: There are also instances when letters not words need to be communicated, and often it is vital that there is no ambiguity.įor instance, a callsign may just be letters, or a car registration may need to be passed on. 'Echo, Delta, Whiskey, Alpha, Romeo, Delta, Sierra'). Where the identity of a particular word or its spelling is important in the communication, it can be spelled out using this alphabet 'Alpha', 'Bravo', 'Charlie' - see below) 1. One approach to mitigating this is the use of spelling alphabets, whereby longer onomatopoeic words are used to represent the letters (e.g. Letters spoken in the conventional way ('Ay', 'Bee', 'Sea' etc) can sound similar and be mis-heard and confused. Verbally spelling, though, can itself be unreliable Where the elimination of ambiguity is important, then words may be spelled out. Voice-based communications can suffer from intelligibility problems. That is, at least, according to the method, but since the results of the analyses are not in close agreement with empirical tests in the literature, ![]() The main conclusions are that the Nato alphabet is quite a good one, but perhaps not as good as it might be. This paper outlines the history of the development of the Nato alphabet and applies the edit-distance method to a number of candidate alphabets. ![]() This is done by calculating the edit distance between the words, which is essentially the number of edit operations required to transform one word into the other. This is based upon expressing the phonetic pronunciation of the words (using the International Phonetic Alphabet)Īnd then measuring the degree of similarity between the words. This paper investigates a method for assessing the distinctiveness of each pair of letters. The best-known example is the Nato alphabet, Alfa, Bravo, Charlie…Ī necessary property of any such alphabet is that the words should be audibly distinguishable. Spelling alphabets are used as a means of ensuring unambiguous voice transmission of letters. Testing the November Alfa Tango Oscar Spelling Alphabet (2.0 *)
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