Integration Azure Speech Recongition with Blazor and .NET 8

Introduction

Welcome to an in-depth guide on integrating Azure Speech-to-Text into your Blazor applications. This article aims to provide a comprehensive walkthrough, allowing you to harness the power of speech recognition technology seamlessly within the dynamic Blazor framework.

Prerequisites

List the prerequisites, including:

Azure subscription with Speech resource
Visual Studio or Visual Studio Code installed
Basic knowledge of Blazor and C#

Step 1: Set Up Azure Resources

1.1 Create an Azure Speech Resource:

1.2 Retrieve Subscription Key and Region:

Steps to find the subscription key and region in the Azure Portal.

Step 2: Create a .NET Blazor App

2.1 Create a New Blazor WebAssembly Or Server App:

dotnet new blazorwasm -n YourBlazorWasmApp
cd YourBlazorWasmApp

2.2 Install Azure Speech SDK:
Install-Package Microsoft.CognitiveServices.Speech

Step 3: Implement Speech-to-Text && Text-to-Speech

3.1 Configure Speech Service in Program.cs:

Code snippet for configuring the Speech service in the Blazor app.

3.2 Create a Speech-to-Text && Text-to-Speech Components :

 @using Microsoft.CognitiveServices.Speech
@using Microsoft.CognitiveServices.Speech.Audio
@using Radzen.Blazor
 <RadzenRow>

    <RadzenColumn Size="6">
        <RadzenSpeechToTextButton Change="OnSpeechCaptured"  />
        <RadzenTextArea @bind-Value=@Inputvalue   Style="margin-top:15px"   />
    </RadzenColumn>
</RadzenRow>

@code {
    string? Inputvalue; 



    async void OnSpeechCaptured( string text )
    { 
        var config = SpeechConfig.FromSubscription("YourSpeechSubscriptionKey", "YourSpeechRegion");
        config.SpeechSynthesisLanguage = "en-US";

        using var audioConfig = AudioConfig.FromDefaultMicrophoneInput();
        using var speechRecognizer = new SpeechRecognizer(config, audioConfig);
        var speechRecongResult = await speechRecognizer.RecognizeOnceAsync();
        OutputSpeechRecognitionResult(speechRecongResult); 
    }

    public void OutputSpeechRecognitionResult(SpeechRecognitionResult speechRecognitionResult)
    {
        switch (speechRecognitionResult.Reason)
        {
            case ResultReason.RecognizedSpeech:
                Inputvalue = speechRecognitionResult.Text;
                break;
            case ResultReason.NoMatch:
                Inputvalue = "NOMATCH: Speech could not be recognized.";

                break;
            case ResultReason.Canceled:
                var cancellation = CancellationDetails.FromResult(speechRecognitionResult);
                 Inputvalue = $"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 set the speech resource key and region values?");
                }
                break;
        }
    }
}

@using Microsoft.CognitiveServices.Speech
@using Microsoft.CognitiveServices.Speech.Audio
@using Radzen.Blazor
 <RadzenRow>

    <RadzenColumn Size="6">
        <RadzenSpeechToTextButton Change="OnSpeechCaptured"  />
        <RadzenTextArea @bind-Value=@Inputvalue   Style="margin-top:15px"   />
    </RadzenColumn>
</RadzenRow>

@code {
    string? Inputvalue; 



    async void OnSpeechCaptured( string text )
    { 
        var config = SpeechConfig.FromSubscription("YourSpeechSubscriptionKey", "YourSpeechRegion");
        config.SpeechSynthesisLanguage = "en-US";

        using var audioConfig = AudioConfig.FromDefaultMicrophoneInput();
        using var speechRecognizer = new SpeechRecognizer(config, audioConfig);
        var speechRecongResult = await speechRecognizer.RecognizeOnceAsync();
        OutputSpeechRecognitionResult(speechRecongResult); 
    }

    public void OutputSpeechRecognitionResult(SpeechRecognitionResult speechRecognitionResult)
    {
        switch (speechRecognitionResult.Reason)
        {
            case ResultReason.RecognizedSpeech:
                Inputvalue = speechRecognitionResult.Text;
                break;
            case ResultReason.NoMatch:
                Inputvalue = "NOMATCH: Speech could not be recognized.";

                break;
            case ResultReason.Canceled:
                var cancellation = CancellationDetails.FromResult(speechRecognitionResult);
                 Inputvalue = $"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 set the speech resource key and region values?");
                }
                break;
        }
    }
}

3.3 Handle Configuration:
In the last provided code snippet , you will notice two placeholders: "YourSpeechSubscriptionKey" and "YourSpeechRegion". These placeholders act as placeholders for your actual Azure Speech resource information.