Speech-to-Text in C#

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This sample demonstrates how to use the Azure Cognitive Services Speech SDK to perform speech recognition in a C# console application.

Program.cs

How to generate this sample

Command

ai dev new speech-to-text --csharp

Output

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See: https://aka.ms/azure-ai-cli-public-preview

Generating 'speech-to-text' in 'speech-to-text-cs' (2 files)...

SpeechToText.csproj
Program.cs

Generating 'speech-to-text' in 'speech-to-text-cs' (2 files)... DONE!

Program.cs

STEP 1: Read the configuration settings from environment variables.

Program.cs

var speechKey = Environment.GetEnvironmentVariable("AZURE_AI_SPEECH_KEY") ?? "<insert your Speech Service API key here>";
var speechRegion = Environment.GetEnvironmentVariable("AZURE_AI_SPEECH_REGION") ?? "<insert your Speech Service region here>";
var speechLanguage = "en-US"; // BCP-47 language code

STEP 2: Create instances of a speech config, source language config, and audio config.

Program.cs

var config = SpeechConfig.FromSubscription(speechKey, speechRegion);
var sourceLanguageConfig = SourceLanguageConfig.FromLanguage(speechLanguage);
var audioConfig = AudioConfig.FromDefaultMicrophoneInput();

STEP 3: Create the speech recognizer from the above configuration information.

Program.cs

using (var recognizer = new SpeechRecognizer(config, sourceLanguageConfig, audioConfig))
{
    Console.WriteLine("Listening ...\n");

STEP 4: Start speech recognition, and return after a single utterance is recognized.

Program.cs

    var result = await recognizer.RecognizeOnceAsync();

STEP 5: Check the result.

Program.cs

    if (result.Reason == ResultReason.RecognizedSpeech)
    {
        Console.WriteLine($"RECOGNIZED: {result.Text}");
    }
    else if (result.Reason == ResultReason.NoMatch)
    {
        Console.WriteLine($"NOMATCH: Speech could not be recognized.");
    }
    else if (result.Reason == ResultReason.Canceled)
    {
        var cancellation = CancellationDetails.FromResult(result);
        Console.WriteLine($"CANCELED: Reason={cancellation.Reason}");

        if (cancellation.Reason == CancellationReason.Error)
        {
            Console.WriteLine($"CANCELED: ErrorCode={cancellation.ErrorCode}");
            Console.WriteLine($"CANCELED: ErrorDetails={cancellation.ErrorDetails}");
            Console.WriteLine($"CANCELED: Did you update the subscription info?");
        }
    }
}