
Amazon Polly's speech marks feature enables real-time text highlighting synchronized with audio playback by providing precise timestamps for when each word is spoken.


<div><p>This article demonstrates how to highlight text in real-time as Amazon Polly speaks it aloud, enabling enhanced text-to-speech applications.</p><ul><li>Amazon Polly generates audio files and speech marks (JSON) showing word/sentence timing</li><li>Speech marks contain timestamps in milliseconds for precise text synchronization</li><li>Solution uses Lambda, API Gateway, S3, and CloudFront for serverless architecture</li><li>Browser-side JavaScript parses speech marks and highlights text using timeouts</li><li>Useful for audiobooks, educational content, accessibility, and dynamic animations</li><li>Alternative approaches include Step Functions, asynchronous processing, or presigned URLs</li><li>Complete CloudFormation template available on GitHub for easy deployment</li></ul><p>This solution provides a practical way to synchronize visual text highlighting with audio playback, improving comprehension and accessibility for text-to-speech applications.</p></div>


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