![]() ![]() #SYNC ATEXT HOW TO#The following snippet illustrates how to subscribe to the viseme event in C#. To enable viseme, you need to subscribe to the VisemeReceived event in Speech SDK (The TTS REST API doesn’t support viseme). With just a few lines of code, you can easily enable facial and mouth animation using the viseme events together with your TTS output. This feature is built into the Speech SDK. (Viseme), Viseme ID: 13, Audio offset: 2350ms. (Viseme), Viseme ID: 5,, Audio offset: 850ms. (Viseme), Viseme ID: 1, Audio offset: 200ms. Often several phonemes correspond to a single viseme, as several phonemes look the same on the face when pronounced, such as ‘s’, ‘z’. #SYNC ATEXT SERIAL#Each viseme is represented by a serial number, and the start time of each viseme is represented by an audio offset. #SYNC ATEXT GENERATOR#Then, the TTS Viseme generator maps the phoneme sequence to the viseme sequence and marks the start time of each viseme in the output audio. Next, the phoneme sequence goes into the TTS Acoustic Predictor and the start time of each phoneme is predicted. A sequence of phonemes defines the pronunciations of the words provided in the text. A phoneme is a basic unit of sound that distinguishes one word from another in a particular language. To generate the viseme output for a given text, the text or SSML is first input into the Text Analyzer, which analyzes the text and provides output in the form of phoneme sequence. The underlying technology for the Speech viseme feature consists of three components: Text Analyzer, TTS Acoustic Predictor, and TTS Viseme Generator. The overall workflow of viseme is depicted in the flowchart below. With the help of a 2D or 3D rendering engine, you can use the viseme output to control the animation of your avatar. The viseme turns the input text or SSML (Speech Synthesis Markup Language) into Viseme ID and Audio offset which are used to represent the key poses in observed speech, such as the position of the lips, jaw and tongue when producing a particular phoneme.
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