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The information provided in this report presents the accuracy
performance of the commercially available Text-to-Speech (TTS)
products. Using a test corpus of over fifteen hundred phrases,
each unit was tested, scored and the results tabulated. 10 TTS
products were tested. Included were products from: AT&T,
Acapela Group; Cepstral; CereProc; IVONA;
Loquendo; Nuance; Microsoft; NeoSpeech;
and SVOX. The test corpus (1,587 words/phrases) was
segmented into categories which included: Number Handling;
Homograph Handling; Handling of Words of Foreign Origin; Acronym
Handling; Abbreviation Handling; Name Handling; and Address
Handling and the test results were presented in these
categories. The average score for all units tested was 77.1%
correct. Overall scores ranged from 55.3% to 94.1% correct.
Within a category, scores ranged from a low of 26.4% to a high
of 99.9%. The products that were tested represented the latest
available release of their product as of August, 2011.
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|
AT&T |
Acapela Group |
Cepstral |
Cere-Proc |
IVONA Software |
Loquendo |
Micro-soft |
Neo-Speech |
Nuance |
SVOX |
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| |
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Total Correct |
N |
1,018 |
1,406 |
1,133 |
1,432 |
1,494 |
1,039 |
1,221 |
1,492 |
1,124 |
878 |
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% |
64.2 |
88.5 |
71.4 |
90.2 |
94.1 |
65.5 |
76.9 |
94.0 |
70.8 |
55.3 |
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The testing (as well as the entire development of the test
program) was funded entirely by Voice Information Associates.
This makes the testing and the results that were obtained unique
in that they are completely unbiased and independent of the
influence of any of the vendors. They represent the most
objective assessment of the relative accuracy of commercially
available TTS products that existed as of August, 2011.
If you have additional questions, or would like to purchase a
copy of this report, contact Walt Tetschner 978-266-1966 or
tetschner@aol.com
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