The LumenVox Speech Engine is an accurate, standards-based speech recognizer that supports multiple languages and can perform speech recognition on audio data from any audio source. On Linux or Windows, the speaker and hardware independent Speech Engine powers speech solutions and platforms deployed in Enterprise and SMB environments worldwide.

It also provides speech application developers with an efficient development and runtime platform, allowing for dynamic language, grammar, audio format, and logging capabilities to customize every step of their application. Grammars are entered as a simple list of words or pronunciations, or in the industry standard Speech Recognition Grammar Specification (SRGS).

Use the Speech Recognition Engine's API in 5 easy steps!

1. Open a new Speech Port representing your connection to the Speech Engine.
2. Load a grammar--multiple grammars can be loaded at once.
3. Load the audio data into a sound channel.
4. Tell our Engine to do a decode on the audio.
5. Get the recognized results!

MRCP
Media Resource Control Protocol

Speech Synthesizers...Audio recorders...DTMF recognizers...Speech Recognizers...Speech verifiers... a fully functioning, media-rich application needs a lot of components to work together. Until now, all of these components had to be provided by a single vendor, or required extensive custom programming to integrate them. MRCP changes all this. The Media Resource Control Protocol allows you to seamlessly manage diverse media resources and provides a common language to speak to all of these devices. With MRCP, vendors can compete on the basis of their strengths, rather than attempting to create an all-inclusive, yet potentially mediocre package. Therefore, you are empowered to take the best product from each vendor, creating a speech application package that is tailored to your particular needs. In essence, MRCP is a protocol specifically designed to address the need for client control of media processing resources such as Speech Recognition and TTS engines. LumenVox supports MRCP v1 and 2 (NLMSL). For more information visit: www.ietf.org

SISR
Semantic Interpretation for Speech Recognition

LumenVox has implemented the W3C's SISR working draft, which is also part of the VXML 2.0 specification. SISR allows grammar authors to embed snippets of JavaScript code into their SRGS grammars, to automatically transform what a speaker says into a format understandable to an application. With LumenVox's Semantic Tags, callers can say, "September thirteenth two thousand four," and your application will understand "2004-09-13."

Server-Side Grammar

Server Side Speech Grammars LumenVox offers even more efficient support for large speech recognition grammars, by allowing clients to pre-load grammars onto the server. This allows users to send the grammar prior to the decode requests.

Voice Activation Detection

In our mobile society, we rarely make calls while sitting in a quiet room. Whether the call is coming from a crowded restaurant or inside of a speeding car, one tricky task for speech recognition software is separating speech from background noise.

The Speech Engine uses a technology called Voice Activity Detection (VAD) to distinguish between actual speech and other sounds. Human speech has qualities that make it distinguishable from other sounds. VAD listens to the incoming audio for these qualities. These include:

• Energy Level (volume)
• Frequency (pitch)
• Changes in frequency
• Duration

What Is Accuracy?

What is generally meant by "accuracy" is the correct recognition of in- grammar utterances, or how successful the speech recognition engine is at recognizing a word or phrase that is an expected spoken response.

How Did We Compare?

For our Accuracy Study we compared the LumenVox Speech Engine with one other leading Speech Engine, "Competitor O," using third-party test data.* We tested five different utterance types, or "domains," which were: Yes/No, Name & Department (ex. Company Directory), Date (Day, Month & Year), Numbers (such as two thousand, one hundred) and Digits (a string of digits).

It should be noted that the test set is a raw sampling of data from telephones and cell phones and includes a reasonable percentage of "noisy" data.

Finally, a fully-integrated speech solution for all Asterisk-based applications is now available.

Go ahead: Speech-enable your Call Router, give the freedom of hands-free phone interactions to your callers, or simply provide an automated interface for customer service.

The Speech Engine is directly and seamlessly integrated with the Asterisk PBX platform and Dial Plan through a unique connector bridge from Digium.