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Microsoft Azure Speech The service failed to synthesize speech from text.

The text input is invalid or unsupported by the service.

Understanding Microsoft Azure Speech Service

Microsoft Azure Speech Service is a powerful tool designed to convert text into natural-sounding speech. It is part of the Azure Cognitive Services suite, which provides developers with the ability to integrate advanced speech capabilities into their applications. This service is particularly useful for creating voice-enabled applications, enhancing accessibility, and improving user interaction through voice commands.

Identifying the Symptom: SpeechSynthesisFailure

When using the Azure Speech Service, you might encounter the SpeechSynthesisFailure error. This issue manifests when the service fails to convert the provided text into speech. Users typically observe this error when the application returns an error message or fails to produce any audio output.

Exploring the Issue: What Causes SpeechSynthesisFailure?

The SpeechSynthesisFailure error often occurs due to invalid or unsupported text input. This could be due to special characters, unsupported languages, or excessively long text strings. Understanding the root cause is essential for troubleshooting and resolving the issue effectively.

Common Causes of SpeechSynthesisFailure

  • Invalid characters or symbols in the text input.
  • Unsupported language or dialect.
  • Text input exceeding the maximum allowed length.

Steps to Resolve SpeechSynthesisFailure

To address the SpeechSynthesisFailure error, follow these actionable steps:

Step 1: Validate Your Text Input

Ensure that your text input is free from invalid characters or symbols. Use a text validation tool or script to clean up the input. For example, you can use regular expressions in your code to remove unwanted characters:

import re

text_input = "Your text here"
validated_text = re.sub(r'[^\w\s]', '', text_input)

Step 2: Check Language Support

Verify that the language and dialect of your text input are supported by Azure Speech Service. You can find the list of supported languages in the Azure Speech Service Language Support documentation.

Step 3: Limit Text Length

Ensure that your text input does not exceed the maximum length allowed by the service. If necessary, break down long text into smaller segments and synthesize them separately.

Additional Resources

For further assistance, consider exploring the following resources:

By following these steps and utilizing the resources provided, you can effectively troubleshoot and resolve the SpeechSynthesisFailure error in your Azure Speech Service applications.

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