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The rules for phoneme lengths, gaps, speed and intonation have been coded by hand in Python, though eSpeak's own intonation data was tried to be copied as much as possible. The Klatt formant data for each individual phoneme was collected mostly from a project called PyKlatt: However it has been further tweaked based on testing and matching with eSpeak's own data. The synthesis engine itself is written in C++ using modern idioms, but closely following the implementation of klsyn-88, found at ĮSpeak is used to parse text into phonemes represented in IPA, making use of existing eSpeak dictionary processing.
It may also have to do with the fact that consonants are also gathered from recorded speech and can therefore be perceived as being injected into the speech stream. Although the authors of NV Speech Player still prefer eSpeak as their synthesizer of choice, they would still hope to try and understand better this strange resistance to eSpeak which may have something to do with eSpeak's spectral frequency synthesis verses Klatt synthesis.
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The eSpeak synthesizer, itself a free and open-source product has proved well as a replacement to a certain number of people in the community, but many people who hear it are extremely quick to point out its "metallic" sound and cannot seem to continue to use it. Modern prototype of a Klatt synthesizer, in the hopes to either be a replacement for synthesizers like Dectalk or Eloquence, or at least restart research and conversation around this synthesis method. NV Speech Player tries to take advantage of this by being a
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However, there is a substantial amount of source code and research material on Klatt synthesis available to the community. However, most if not all of the acceptable quality synthesizers are commercial and are rather expensive.īoth Dectalk and Eloquence were closed-source commercial products themselves. This was an advantage for usage in mainstream applications such as GPS units or telephone systems, but not necessarily so much of an advantage to the blind, who tend to care more about responsiveness and predictability over prettiness.Īlthough synthesizers such as Dectalk and Eloquence continued to be maintained and available for nearly 20 years, now they are becoming harder to get, with multiple companies saying that these, and their variants, have been end-of-lifed and will not be updated anymore.Ĭoncatinative synthesis is now starting to show promise as a replacement as the responsiveness and smoothness is improving. However, research soon moved onto other forms of synthesis such as concatinative speech, as although this was slower, it was much closer to the human voice. They are well suited for use by the blind as they are extremely responsive, their pronunciation is smooth and predictable, and they are small in memory footprint. Some well-known Klatt synthesizers are Dectalk and Eloquence. One of the most prominent synthesis models that appeared was a formant-frequency synthesis known as Klatt synthesis. The 70s and 80s saw much research in speech synthesis.
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This applies toīoth original and modified copies of this software, plus anyįor further details, you can view the license online at: Source code available to anyone who wants it.
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You are free to share or change this software in any way you likeĪs long as it is accompanied by the license and you make all NV Speech Player is covered by the GNU General Public License (Version 2). NV Speech Player is Copyright (c) 2014 NV Speech Player contributors
It generates speech using Klatt synthesis, making it somewhat similar to speech synthesizers such as Dectalk and Eloquence. NV Speech Player is a free and open-source prototype speech synthesizer that can be used by NVDA. Note that the eSpeak-ng/espeak-ng project also includes a copy of the speechPlayer code as an alternative Klatt implementation. This includes the speechPlayer core itself, plus the nvSpeechPlayer NVDA add-on also in this repository. If you make use of this project or find it interesting, and you have the time and expertise to maintain it, please feel free to fork it and let us know you are interested in taking it on. NV Access is no longer maintaining this project. A Klatt-based speech synthesis engine written in c++Īuthor: NV Access Limited Maintenance Note
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