I'm a lead developer at Quizlet. We're using a combination of our own technology and licensing/purchasing TTS software from several different companies.
I don't know which specific engine Quizlet are using, but assuming they are using a free service then it might be TTS-API (http://tts-api.com/) which was recently featured on Hacker News.
From what I know is the only "free-to-use" TTS web-API out there. Please comment below if I'm wrong - I'd love to find similar free services. There are a lot of pay only services out there but very very few truly free ones.
Since finding out about TTS-API on HN I've successfully used it in a recent app project. Since the TTS is only a HTTP fetch away I was able to quickly integrate it in both the iOS and Android versions of my app. The service appears to be very quick, so no complaints so far :-)
Nobody gave the right answer. They have their own TTS engine that is connected to a single file located at http://quizlet.com/tts/en.mp3 the file takes arguments with it so the url http://quizlet.com/tts/en.mp3?v=14&b=QXJlYSBvZiBwYXJhbGxlbG9ncmFt&s=m5dx52Q. says "Area of parallelogram" thanks the first base64 string labeled b. I have not discovered what v or s are used for but I know they are essential for making the file speak. I will do more research and get back to this answer.
jj b is correct. The core engine of Quizlet's speech features is Neospeech, and uses Neospeech's VTML (VoiceText [TM] Markup Language) exactly, as far as I can tell.
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Majdron，
我是 Quizlet 的首席开发人员。我们结合使用自己的技术和从多家不同公司许可/购买 TTS 软件。
有一些开源 TTS 引擎/语音：
祝你好运！
Majdron,
I'm a lead developer at Quizlet. We're using a combination of our own technology and licensing/purchasing TTS software from several different companies.
There are some open source TTS engines/voices:
Good luck!
这些声音听起来与 http://www.neospeech.com 完全相同。此外，他们的语言列表完全匹配。
它不是免费的，您必须获得许可。
The voices sound exactly the same as http://www.neospeech.com. Also, their list of languages match exactly.
It's not free, you have to license it.
谷歌刚刚通过 HTML5 推出了基于浏览器的语音引擎访问。
http://slides.html5rocks.com/#speech-input
使此页面正常工作，我在 Ubuntu 中启动了 Chromium 浏览器，如下所示：
我不确定这是否适用于其他操作系统。
另一个有趣的项目是来自麻省理工学院的 WAMI：
http://wami.csail.mit.edu
Google has just introduced browser-based access to its speech engine through HTML5.
http://slides.html5rocks.com/#speech-input
To get this page to work, I launched the Chromium browser as follows in Ubuntu:
I'm not sure if this works in other operating systems.
Another interesting project is WAMI from MIT:
http://wami.csail.mit.edu
我不知道 Quizlet 使用的是哪个特定引擎，但假设他们使用免费服务，那么它可能是 TTS-API ( http://tts-api.com/）最近在黑客新闻上得到了专题报道。
据我所知，这是唯一“免费使用”的 TTS Web-API。如果我错了，请在下面发表评论 - 我很想找到类似的免费服务。市面上有很多付费服务，但真正免费的服务却很少。
自从在 HN 上发现 TTS-API 以来，我已经在最近的应用程序项目中成功使用了它。由于 TTS 只需通过 HTTP 获取即可，因此我能够快速将其集成到我的应用程序的 iOS 和 Android 版本中。该服务似乎非常快，所以到目前为止没有投诉:-)
I don't know which specific engine Quizlet are using, but assuming they are using a free service then it might be TTS-API (http://tts-api.com/) which was recently featured on Hacker News.
From what I know is the only "free-to-use" TTS web-API out there. Please comment below if I'm wrong - I'd love to find similar free services. There are a lot of pay only services out there but very very few truly free ones.
Since finding out about TTS-API on HN I've successfully used it in a recent app project. Since the TTS is only a HTTP fetch away I was able to quickly integrate it in both the iOS and Android versions of my app. The service appears to be very quick, so no complaints so far :-)
没有人给出正确答案。他们有自己的 TTS 引擎，连接到位于 http://quizlet.com/tts/ 的单个文件en.mp3 文件带有参数，因此 url http://quizlet.com/tts/en.mp3?v=14&b=QXJlYSBvZiBwYXJhbGxlbG9ncmFt&s=m5dx52Q。说“平行四边形的面积”，感谢第一个标记为 b 的 Base64 字符串。我还没有发现 v 或 s 的用途，但我知道它们对于使文件说话至关重要。我会做更多研究并回到这个答案。
Nobody gave the right answer. They have their own TTS engine that is connected to a single file located at http://quizlet.com/tts/en.mp3 the file takes arguments with it so the url http://quizlet.com/tts/en.mp3?v=14&b=QXJlYSBvZiBwYXJhbGxlbG9ncmFt&s=m5dx52Q. says "Area of parallelogram" thanks the first base64 string labeled b. I have not discovered what v or s are used for but I know they are essential for making the file speak. I will do more research and get back to this answer.
jj b 是正确的。 Quizlet 语音功能的核心引擎是 Neospeech，据我所知，它完全使用 Neospeech 的 VTML（VoiceText [TM] 标记语言）。
jj b is correct. The core engine of Quizlet's speech features is Neospeech, and uses Neospeech's VTML (VoiceText [TM] Markup Language) exactly, as far as I can tell.