google-chrome - 将 SSML 与 Web Speech API 结合使用的正确方法

Question

Web Speech API specification说:

text attribute
This attribute specifies the text to be synthesized and spoken for this utterance. This may be either plain text or a complete, well-formed SSML document. For speech synthesis engines that do not support SSML, or only support certain tags, the user agent or speech engine must strip away the tags they do not support and speak the text.

它没有提供使用 text 的示例。带有 SSML 文档。

我在 Chrome 33 中尝试了以下操作:

var msg = new SpeechSynthesisUtterance();
msg.text = '<?xml version="1.0"?>\r\n<speak version="1.0" xmlns="http://www.w3.org/2001/10/synthesis" xml:lang="en-US">ABCD</speak>';
speechSynthesis.speak(msg);

它没有用——声音试图叙述 XML 标签。这个代码有效吗？
我是否必须提供 XMLDocument对象？

我试图了解 Chrome 是否违反了规范(应该报告为错误)，或者我的代码是否无效。

Answer 1

在 Chrome 46 中，当语言设置为 en 时，XML 被正确解释为 XML 文档，在 Windows 上。 ;但是，我没有看到标签实际上在做任何事情的证据。听说<emphasis>没区别和非 <emphasis>此 SSML 的版本:

var msg = new SpeechSynthesisUtterance();
msg.text = '<?xml version="1.0"?>\r\n<speak version="1.0" xmlns="http://www.w3.org/2001/10/synthesis" xml:lang="en-US"><emphasis>Welcome</emphasis> to the Bird Seed Emporium.  Welcome to the Bird Seed Emporium.</speak>';
msg.lang = 'en';
speechSynthesis.speak(msg);

<phoneme> tag 也被完全忽略了，这让我尝试说 IPA 失败了。

var msg = new SpeechSynthesisUtterance();
msg.text='<?xml version="1.0" encoding="ISO-8859-1"?> <speak version="1.0" xmlns="http://www.w3.org/2001/10/synthesis" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.w3.org/2001/10/synthesis http://www.w3.org/TR/speech-synthesis/synthesis.xsd" xml:lang="en-US"> Pavlova is a meringue-based dessert named after the Russian ballerina Anna Pavlova. It is a meringue cake with a crisp crust and soft, light inside, usually topped with fruit and, optionally, whipped cream.  The name is pronounced <phoneme alphabet="ipa" ph="p&aelig;v&#712;lo&#650;v&#601;">...</phoneme> or <phoneme alphabet="ipa" ph="p&#593;&#720;v&#712;lo&#650;v&#601;">...</phoneme>, unlike the name of the dancer, which was <phoneme alphabet="ipa" ph="&#712;p&#593;&#720;vl&#601;v&#601;">...</phoneme> </speak>';
msg.lang = 'en';
speechSynthesis.speak(msg);

尽管事实上 Microsoft 语音 API 确实正确处理了 SSML。这是一个 C# 片段，适用于 LinqPad :

var str = "Pavlova is a meringue-based dessert named after the Russian ballerina Anna Pavlova. It is a meringue cake with a crisp crust and soft, light inside, usually topped with fruit and, optionally, whipped cream.  The name is pronounced /pævˈloʊvə/ or /pɑːvˈloʊvə/, unlike the name of the dancer, which was /ˈpɑːvləvə/.";
var regex = new Regex("/([^/]+)/");
if (regex.IsMatch(str))
{
    str = regex.Replace(str, "<phoneme alphabet=\"ipa\" ph=\"$1\">word</phoneme>");
    str.Dump();
}   
SpeechSynthesizer synth = new SpeechSynthesizer();
PromptBuilder pb = new PromptBuilder();
pb.AppendSsmlMarkup(str);
synth.Speak(pb);