ACA acrophonic cyclic alphabet ( a spelling alphabet ) As new workers with speech recognition come to a realization that their model frequently does not give the correct word, they come up with a bright idea. Just spell things out loud. But since alphabetic sounds are short and similar, they are not the cure. The NATO Phonetic Alphabet has stood the test of time for communicating in high noise environments and over the static obscuring and frequency shifting radio and long line voice communication. How well does this serve for the chalenge of speech recognition at the close of the first decade of the 21 st century? Both problems share confusion of similar sounds, variation in speakers, and random information drop out and distortion. However in one case the listener is a human and in the other a machine. Deficencies lie in short and one sylable words, allowing many different pronunciations of each code word, and requiring considerable training suitable to motivated and skilled users. Just as many of us learned to count by sequencing (One two buckle my shoe), the ACA builds on the well rehearsed alphabetic and neumeric cycle. The word is identified as a symbole by the introductry phonemes k ow d. Then add the letter or number and the next two in sequence. At the end, wrap to the beginning. Pronunciation should be standard. A is ey 0 is zero z is zee 4 is f ao r (rhotic) codeABC [A] codeXYZ [X] codeYZA [Y] codeZAB [Z] code012 [0] code123 [1] code789 [7] code890 [8] code901 [9] The symbol in the [] is the output for the word. codeABC [A] k ow d ey b iy s iy codeBCD [B] k ow d b iy s iy d iy codeCDE [C] k ow d s iy d iy iy codeDEF [D] k ow d d iy iy eh f codeEFG [E] k ow d iy eh f jh iy codeFGH [F] k ow d eh f jh iy ey ch codeGHI [G] k ow d jh iy ey ch ay codeHIJ [H] k ow d ey ch ay jh ey codeIJK [I] k ow d ay jh ey k ey codeJKL [J] k ow d jh ey k ey eh l codeKLM [K] k ow d k ey eh l eh m codeLMN [L] k ow d eh l eh m eh n codeMNO [M] k ow d eh m eh n ow codeNOP [N] k ow d eh n ow p iy codeOPQ [O] k ow d ow p iy k y uw codePQR [P] k ow d p iy k y uw aa r codeQRS [Q] k ow d k y uw aa r eh s codeRST [R] k ow d aa r eh s t iy codeSTU [S] k ow d eh s t iy y uw codeTUV [T] k ow d t iy y uw v iy codeUVW [U] k ow d y uw v iy d ah b ah l y uw codeVWX [V] k ow d v iy d ah b ah l y uw eh k s codeWXY [W] k ow d d ah b ah l y uw eh k s w ay codeXYZ [X] k ow d eh k s w ay z iy codeYZA [Y] k ow d w ay z iy ey codeZAB [Z] k ow d z iy ey b iy code012 [0] k ow d z ih r ow w ah n t uw code123 [1] k ow d w ah n t uw th r iy code234 [2] k ow d t uw th r iy f ao r code345 [3] k ow d th r iy f ao r f ay v code456 [4] k ow d f ao r f ay v s ih k s code567 [5] k ow d f ay v s ih k s s eh v ah n code678 [6] k ow d s ih k s s eh v ah n ey t code789 [7] k ow d s eh v ah n ey t n ay n code890 [8] k ow d ey t n ay n z ih r ow code901 [9] k ow d n ay n z ih r ow w ah n