Text To Speech

Many Tizen users have different abilities that require them to interact with TV in different ways. These include users who have visual, physical or age-related limitations that prevent them from fully seeing or using a TV, and users with hearing loss who may not be able to perceive audible information and alerts.

Samsung Smart TV(Legacy TV of Orsay platform) supports Web Speech API, you can use TTS (Text to speech) feature to support accessibility of your application.

Basic Usage

If user turns on Accessibility option for TTS in menu, TTS will read contents of HTML elements automatically.

TTS feature can be access using following sequence on remote controller:
TV Menu > System > Accessibility > Voice Guide > On

Note

Please note that if your TV doesn't support Voice Guide function, you might not be able to find "Voice Guide" menu in your TV

1. Web Speech

This API allows the application to control all the text to be spoken by the device;
This is possible by using the SpeechSynthesys interface of the Web Specch API.

WebSpeech basic example:

var synth = window.speechSynthesis;
var text = "Any text that should be spoken";
var ttsObject = new SpeechSynthesisUtterance(text);

ttsObject.ON-END = function(event) {
	console.log('Utterance has finished being spoken after ' + event.elapsedTime + ' milliseconds.');
}

ttsObject.ON-START = function(event) {
	console.log('We have started uttering this speech: ', event);
}

synth.speak(ttsObject);// Device will start to speak "Any text that should be spoken"

1.1 Voice Guide status.

CP could get current status of Voice Guide menu to enable TTS feature.

CP needs to activate TTS when the Voice Guide value is set to ON(true).

HTML

<!--Required to use Voice Guide API-->

<script type="text/javascript" src="$MANAGER_WIDGET/Common/webapi/1.0/webapis.js"></script>

Javascript

//TTS enabled true/false
//true : Voice Guide is ON
//false : Voice Guide is OFF

webapis._plugin("RECOG", "IsTTSEngineEnabled")

1.2 HTML5 Web Speech API Specification

SpechSynthesis Attributes

SpechSynthesis Methods

SpeechSynthesisUtterance Attributes

1.3 Web Speech API Platform Limitation

We have Platform side limitation for some API/Attibutes below.