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Google WaveNet Invalid Sample Rate

The audio sample rate is not supported by the API.

Understanding Google WaveNet

Google WaveNet is a powerful text-to-speech (TTS) technology developed by DeepMind, a subsidiary of Google. It is part of Google's Voice AI API offerings and is designed to generate human-like speech from text input. This tool is widely used in various applications, including virtual assistants, customer service bots, and accessibility tools, due to its ability to produce natural-sounding speech.

Identifying the Symptom: Invalid Sample Rate

When working with Google WaveNet, you might encounter an error message indicating an 'Invalid Sample Rate.' This issue typically arises when the audio sample rate of your input file does not match the supported sample rates of the API. As a result, the API cannot process the audio file, leading to a failure in generating the desired output.

Exploring the Issue: Why the Error Occurs

The 'Invalid Sample Rate' error occurs because Google WaveNet requires audio files to be in specific sample rates to ensure compatibility and optimal performance. The most commonly supported sample rate is 16000 Hz. If your audio file is not in this format, the API will reject it, resulting in the error message.

Supported Sample Rates

To avoid this error, ensure that your audio files are in one of the supported sample rates. You can find more information about supported formats in the Google Cloud Text-to-Speech API documentation.

Steps to Fix the Invalid Sample Rate Issue

To resolve the 'Invalid Sample Rate' error, you need to convert your audio file to a supported sample rate. Here are the steps to do so:

Step 1: Identify the Current Sample Rate

First, check the current sample rate of your audio file. You can use tools like FFmpeg to inspect the audio file properties. Run the following command in your terminal:

ffmpeg -i your_audio_file.wav

This command will display the audio file's properties, including the sample rate.

Step 2: Convert the Audio to a Supported Sample Rate

Once you have identified the current sample rate, use FFmpeg to convert the audio file to a supported sample rate, such as 16000 Hz. Use the following command:

ffmpeg -i your_audio_file.wav -ar 16000 converted_audio_file.wav

This command will create a new audio file with the correct sample rate.

Step 3: Verify the Conversion

After conversion, verify that the new audio file has the correct sample rate by running the FFmpeg command again:

ffmpeg -i converted_audio_file.wav

Ensure that the sample rate is now 16000 Hz.

Conclusion

By following these steps, you can resolve the 'Invalid Sample Rate' error when using Google WaveNet. Ensuring that your audio files are in the correct format will help you leverage the full potential of this powerful text-to-speech tool. For more detailed guidance, refer to the Google Cloud Text-to-Speech documentation.

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