c# - 如果扬声器远离麦克风，Google Speech/NAudio 会有很大的延迟

问题描述

我正在使用谷歌语音 api 和 NAudio（使用 NAudio WaveInEvent 类）对文本进行语音。像这样：https ://cloud.google.com/speech-to-text/docs/streaming-recognize?hl=en （“在音频流上执行流式语音识别”的 C# 示例）

如果说话的人靠近麦克风，一切都会很好而且很快。但是如果说话的人离麦克风很远，他的前 3-5 个单词就无法识别。之后，其他单词被很好地识别。（所以它不可能是距离的一般问题）更像是距离的适应问题，或者可能 NAudio 没有以 100% 的音量输入进行录制。

对这个问题有什么想法吗？

编辑：这是要求的代码：

static async Task<object> StreamingMicRecognizeAsync(int seconds)
{
    if (NAudio.Wave.WaveIn.DeviceCount < 1)
    {
        Console.WriteLine("No microphone!");
        return -1;
    }
    var speech = SpeechClient.Create();
    var streamingCall = speech.StreamingRecognize();
    // Write the initial request with the config.
    await streamingCall.WriteAsync(
        new StreamingRecognizeRequest()
        {
            StreamingConfig = new StreamingRecognitionConfig()
            {
                Config = new RecognitionConfig()
                {
                    Encoding =
                    RecognitionConfig.Types.AudioEncoding.Linear16,
                    SampleRateHertz = 16000,
                    LanguageCode = "en",
                },
                InterimResults = true,
            }
        });
    // Print responses as they arrive.
    Task printResponses = Task.Run(async () =>
    {
        while (await streamingCall.ResponseStream.MoveNext(
            default(CancellationToken)))
        {
            foreach (var result in streamingCall.ResponseStream
                .Current.Results)
            {
                foreach (var alternative in result.Alternatives)
                {
                    Console.WriteLine(alternative.Transcript);
                }
            }
        }
    });
    // Read from the microphone and stream to API.
    object writeLock = new object();
    bool writeMore = true;
    var waveIn = new NAudio.Wave.WaveInEvent();
    waveIn.DeviceNumber = 0;
    waveIn.WaveFormat = new NAudio.Wave.WaveFormat(16000, 1);
    waveIn.DataAvailable +=
        (object sender, NAudio.Wave.WaveInEventArgs args) =>
        {
            lock (writeLock)
            {
                if (!writeMore) return;
                streamingCall.WriteAsync(
                    new StreamingRecognizeRequest()
                    {
                        AudioContent = Google.Protobuf.ByteString
                            .CopyFrom(args.Buffer, 0, args.BytesRecorded)
                    }).Wait();
            }
        };
    waveIn.StartRecording();
    Console.WriteLine("Speak now.");
    await Task.Delay(TimeSpan.FromSeconds(seconds));
    // Stop recording and shut down.
    waveIn.StopRecording();
    lock (writeLock) writeMore = false;
    await streamingCall.WriteCompleteAsync();
    await printResponses;
    return 0;
}

来源：https ://cloud.google.com/speech-to-text/docs/streaming-recognize?hl=en

标签： c#.netspeech-recognitionnaudiogoogle-speech-api

c# - 如果扬声器远离麦克风，Google Speech/NAudio 会有很大的延迟

问题描述

解决方案

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