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Speech-to-text WPF sample for .NET Framework on Windows

This sample demonstrates how to recognize speech with C# in a WPF application under the .NET Framework on Windows. It demonstrates recognition in the language of your choice, from file or microphone. It can show side-by-side results of speech recognition using the base model and a custom model that you created using CRIS.

The sample runs on .NET Framework 4.6.1 (or above) on Windows.

Prerequisites

  • A subscription key for the Speech service. See Try the speech service for free.
  • A Windows PC; some sample scenarios require a working microphone.
  • Microsoft Visual Studio 2017, Community Edition or higher.
  • The .NET desktop development workload in Visual Studio. You can enable it in Tools > Get Tools and Features.

Build the sample

  • By building this sample you will download the Microsoft Cognitive Services Speech SDK. By downloading you acknowledge its license, see Speech SDK license agreement.
  • Download the sample code to your development PC.
  • Start Microsoft Visual Studio 2017 and select File > Open > Project/Solution.
  • Navigate to the folder containing this sample, and select the solution file contained within it.
  • Press Ctrl+Shift+B, or select Build > Build Solution.

Run the sample

To debug the app and then run it, press F5 or use Debug > Start Debugging. To run the app without debugging, press Ctrl+F5 or use Debug > Start Without Debugging.

The app displays a graphical user interface (GUI), which shows baseline model recognition results on the left and custom model speech recognition results on the bottom. Use the Settings fly-out on the right to configure input source, recognition type, region and language, and (most importantly) your subscription key.

If you like detailed output from the speech service, use the Baseline Model Output and Custom Model Output fly-outs at the bottom of the GUI.

Notes

  • If you use the Save Keys button, your subscription key will be written to an unencrypted file named SubscriptionKey.txt on your disk, inside .NET Isolated Storage. Please use the documentation if you'd like to locate and delete this file.

  • If you are using your own .wav file as input source, make sure it is in the right format. Currently, the only supported .wav format is mono (single-channel), 16 kHz sample rate, 16 bits per sample.

References