As a consequence, expanding the capabilities of the web platform can in many cases be done in JavaScript or by compiling to JavaScript, instead of adding new code to the browsers themselves, which inevitably takes longer – especially if you wait for all browsers to implement a particular feature. The development versions of the top JavaScript engines today can run code compiled from C++ only 3-5X slower than a fast C++ compiler, and getting even better.
The generated speech will be exactly the same on all platforms, unlike if your users each did TTS in their own way (using an OS capability, or a separate program). (see the speak.js website for instructions). js file in your website, and then generating speech is about as simple as writing speak("hello world") Why would you want TTS in JavaScript? Well, with speak.js you can bundle a single. speak.js has not yet focused on speed, but with some additional work it could be much faster, if that turns out to be an issue.) (Note that while that is a very simple way to do things, it isn’t the most efficient. That URL is then loaded in an HTML5 audio element, letting the browser handle playback.
speak.js then takes that data, encodes it using base64, and creates a data URL. wav file with the generated audio to the emulated filesystem. The result of running the compiled eSpeak code is that it ‘writes’ a. This allows the normal eSpeak datafiles to be used (either through an xhr, or by converting them to JSON and bundling them with the script file). Once compiled, the eSpeak code in speak.js doesn’t know it’s running on the web: speak.js uses the Emscripten emulated filesystem to ‘fake’ the normal file reading and writing calls that the eSpeak C++ code has (fopen, fread, etc.). speak.js is a port of eSpeak, an open source speech synthesizer, from C++ to JavaScript using Emscripten.Ĭompiling an existing speech synthesis engine to JavaScript is a good way to avoid writing a complicated project like eSpeak from scratch.
One possible approach is shown in this demo, which is powered by speak.js, a new 100% pure JavaScript/HTML5 TTS implementation. Text-to-Speech (TTS) can make content more accessible, but there is so far no simple and universal way to do that on the web.
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