March 5, 2021
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Speak and Listen to the Web using SALT

  • By Brian Graham
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SALT Elements

SALT is a set of XML elements and their associated attributes, events and methods. The five most important elements for multimodal use include the prompt, listen, grammar, record and bind elements.

A speech prompt is a SALT element that instructs the browser to play a recorded audio file or text-to-speech synthesis. Any events such as voice input from the user or an event that occurs in HTML (page loading, a button being clicked, mouse over, etc.) can trigger a prompt to play.

A listen element activates the device's microphone to listen for speech input or record audio. As a parent element, the listen element manages the grammar element (for specifying input grammars during speech recognition) and the record element (for recording speech as a wav file).

The bind element enables you to add results from speech input and insert functionality to HTML elements on the page such as forms, text and other elements.

SALT Development Tool

Voice Web Studio by Voice Web Solutions, www.voicewebsolutions.net, is one such tool that enables developers to build SALT-enhanced Web sites that recognize speaker input, generate text-to-speech, and record audio. By using the highly popular Macromedia Dreamweaver MX as a development platform, Voice Web Studio enables developers to speech activate any new or existing Web page directly within the familiar and versatile Macromedia programming environment. With Voice Web Studio, developers can design and edit speech recognition, audio playback and human-computer dialog controls, as well as create HTML behaviors based on speech events. Thus, developers can quickly build a speech dialog grammar that listens for the user input and activates Web links, scrolls up and down, fills forms, and more.

About the Author

Brian Graham's role as Chief Architect is to lead Voice Web Solutions's vision as the premier Voice Web tools provider. Brian brings extensive experience in the development of Voice Web technologies to Voice Web Solutions, and has served on the VoxML and VoiceXML forum since their inception in addition to the SALT forum. In 1999, Brian's research and development efforts led to the creation of Drive It! - the world's first application designed to deliver fully automated, speech driven, point-to-point Internet-based driving directions via the telephone.

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This article was originally published on April 3, 2003

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