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你好，我正在尝试为 C# windows 应用程序找到免费且有用的语音识别。我试过System.Speech.Recognition; 但是如果没有预先录制短语或单词并且我想使用DictationGrammar有时我必须说 20 次相同的短语或单词，但 20 次我的识别结果是错误的。所以我并不是说它不能很好地工作，但它不适用于我的情况。因此，如果我能以某种方式使其更好地工作，请在这里需要您的帮助：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

//using System.Speech;
using System.Speech.Recognition;

public class Program
{
    public static void Main()
    {

        SpeechRecognitionEngine recognizer = new SpeechRecognitionEngine();
        Grammar dictationGrammar = new DictationGrammar();
        recognizer.LoadGrammar(dictationGrammar);

        try
        {

            recognizer.SetInputToDefaultAudioDevice();
            RecognitionResult result = recognizer.Recognize();
            Console.WriteLine (result.Text);
        }
        catch (InvalidOperationException exception)
        {
            Console.WriteLine (String.Format("Could not recognize input from default aduio device. Is a microphone or sound card available?\r\n{0} - {1}.", exception.Source, exception.Message));
        }
        finally
        {
            recognizer.UnloadAllGrammars();
        }

        Console.Read();

    }

}

我在使用 Python 进行Google Speech Recognition之前尝试过，它至少正确率为 95%，足以说，这对我来说已经足够了，但显然如果我没有密钥，它就不能免费使用：

System.Net.WebException: The remote server returned an error: (403) Forbidden.
   at System.Net.HttpWebRequest.GetResponse()
   at GoogleRequest.Program.Main(String[] args) in C:\FOLDER\02_WORKFILE\Program.cs:line 36

说 API 密钥仅用于 Chromium 开发，而不是在此列表中提问https://www.chromium.org/developers/how-tos/api-keys也许还有其他一些使用方法：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.IO;

namespace GoogleRequest
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {

                FileStream fileStream = File.OpenRead("good-morning-google.flac");
                MemoryStream memoryStream = new MemoryStream();
                memoryStream.SetLength(fileStream.Length);
                fileStream.Read(memoryStream.GetBuffer(), 0, (int)fileStream.Length);
                byte[] BA_AudioFile = memoryStream.GetBuffer();
                HttpWebRequest _HWR_SpeechToText = null;
                _HWR_SpeechToText =
                            (HttpWebRequest)HttpWebRequest.Create(
                                "https://www.google.com/speech-api/v2/recognize?output=json&lang=en-us&key=YOUR_API_KEY_HERE");
                _HWR_SpeechToText.Credentials = CredentialCache.DefaultCredentials;
                _HWR_SpeechToText.Method = "POST";
                _HWR_SpeechToText.ContentType = "audio/x-flac; rate=44100";
                _HWR_SpeechToText.ContentLength = BA_AudioFile.Length;
                Stream stream = _HWR_SpeechToText.GetRequestStream();
                stream.Write(BA_AudioFile, 0, BA_AudioFile.Length);
                stream.Close();

                HttpWebResponse HWR_Response = (HttpWebResponse)_HWR_SpeechToText.GetResponse();
                if (HWR_Response.StatusCode == HttpStatusCode.OK)
                {
                    StreamReader SR_Response = new StreamReader(HWR_Response.GetResponseStream());
                    Console.WriteLine(SR_Response.ReadToEnd());
                }

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }

            Console.ReadLine();
        }
    }
}

我也尝试使用 Bing Speech API，但似乎它仅用于这里的 XAML 应用程序msdn.microsoft.com/en-us/library/dn434606.aspx和msdn.microsoft.com/en-us/library/dn467592.aspx

然后我找到了这个工具列表，但似乎没有什么是免费的http://www.dmoz.org/Computers/Speech_Technology/Toolkits/

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