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The CMU Pronouncing Dictionary (also known as CMUdict) is an open-source pronouncing dictionary originally created by the Speech Group at Carnegie Mellon University (CMU) for use in speech recognition research. CMUdict provides a mapping orthographic/phonetic for English words in their North American pronunciations.
It represents phonemes and allophones of General American English with distinct sequences of ASCII characters. Two systems, one representing each segment with one character (alternating upper- and lower-case letters) and the other with one or two (case-insensitive), were devised, the latter being far more widely adopted.
This chart provides audio examples for phonetic vowel symbols. The symbols shown include those in the International Phonetic Alphabet (IPA) and added material. The chart is based on the official IPA vowel chart.
The American Heritage Dictionary of the English Language (abbreviated AHD) uses a phonetic notation based on the Latin alphabet to transcribe the pronunciation of spoken English. It and similar respelling systems, such as those used by the Merriam-Webster and Random House dictionaries, are familiar to US schoolchildren.
Phonemic notation commonly uses IPA symbols that are rather close to the default pronunciation of a phoneme, but for legibility often uses simple and 'familiar' letters rather than precise notation, for example /r/ and /o/ for the English [ɹʷ] and [əʊ̯] sounds, or /c, ɟ/ for [t͜ʃ, d͜ʒ] as mentioned above.
Some dictionaries, such as the Cambridge English Pronouncing Dictionary and the Longman Dictionary of Contemporary English provide a separate transcription for each. British and American English dialects have a similar set of phonemes, but some are pronounced differently; in technical parlance, they consist of different phones.
Phonemic vowel length, which exists in some dialects and involves pairs such as /ɛ/ vs. /ɛər/ and /ə/ vs. /ɜːr/ is also not marked explicitly. /i/ and /u/ do not represent phonemes; see above. Flapping in words such as better, which we write /ˈbɛtər/, rather than /ˈbɛdər/.
The English Pronouncing Dictionary (EPD) was created by the British phonetician Daniel Jones and was first published in 1917. [1] It originally comprised over 50,000 headwords listed in their spelling form, each of which was given one or more pronunciations transcribed using a set of phonemic symbols based on a standard accent.