Hello Nawaz,
Greetings and Welcome to Microsoft Q&A! Thanks for posting the question.
Currently, Neural HD voices are not supported with Azure TTS Avatar. However, you can use Custom Neural Voices (CNV) with Azure TTS Avatar to create a high-quality, personalized voice experience. If you require a unique voice for your avatar, you can train a Custom Neural Voice using high-quality audio samples. While direct integration of Neural HD voices is not available. To achieve this, you’ll need to record high-quality audio samples from a voice talent and use them to train your custom voice model. Once the model is trained, you can integrate it with your avatar to deliver a more natural and personalized auditory experience. Please refer the NOTE in this High definition (Preview).
However, you can keep an eye on the Azure AI Service release notes for updates on What's new page will be updated accordingly with more details.
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