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我正在尝试使用 TarsosDSP 库从 .wav 文件中检测音高，并且频率的结果总是小于一半。

这是我的代码。

    public class Main {

public static void main(String[] args){
    try{
        float sampleRate = 44100;
        int audioBufferSize = 2048;
        int bufferOverlap = 0;

        //Create an AudioInputStream from my .wav file
        URL soundURL = Main.class.getResource("/DetectPicthFromWav/329.wav");
        AudioInputStream stream = AudioSystem.getAudioInputStream(soundURL);

        //Convert into TarsosDSP API
        JVMAudioInputStream audioStream = new JVMAudioInputStream(stream);
        AudioDispatcher dispatcher = new AudioDispatcher(audioStream, audioBufferSize, bufferOverlap);
        MyPitchDetector myPitchDetector = new MyPitchDetector();
        dispatcher.addAudioProcessor(new PitchProcessor(PitchEstimationAlgorithm.YIN, sampleRate, audioBufferSize, myPitchDetector));
        dispatcher.run();


    }
    catch(FileNotFoundException fne){fne.printStackTrace();}
    catch(UnsupportedAudioFileException uafe){uafe.printStackTrace();}
    catch(IOException ie){ie.printStackTrace();}
}
}

    class  MyPitchDetector implements PitchDetectionHandler{

//Here the result of pitch is always less than half.
@Override
public void handlePitch(PitchDetectionResult pitchDetectionResult,
        AudioEvent audioEvent) {
    if(pitchDetectionResult.getPitch() != -1){
        double timeStamp = audioEvent.getTimeStamp();
        float pitch = pitchDetectionResult.getPitch();
        float probability = pitchDetectionResult.getProbability();
        double rms = audioEvent.getRMS() * 100;
        String message = String.format("Pitch detected at %.2fs: %.2fHz ( %.2f probability, RMS: %.5f )\n", timeStamp,pitch,probability,rms);
        System.out.println(message);
    }
}
}

329.wav 文件是从http://onlinetonegenerator.com/网站以 329Hz 生成的。我不知道为什么结果音高总是 164.5Hz。我的代码有问题吗？

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2 回答 2

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好吧，我不知道您使用的是什么方法，但是通过查看频率是如何精确减半的，这可能是设置错误采样率的问题？

大多数操作在对信号进行采样时假定初始采样率，也许您已将其作为参数（或其默认值）传递了一半？

于 2016-04-04T16:22:33.710 回答
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我刚刚在 Android 上遇到了与 TarsosDSP 相同的问题。对我来说，答案是来自http://onlinetonegenerator.com/的文件具有 32 位样本而不是 16 位样本，这似乎是默认值。相关代码：

AssetFileDescriptor afd = getAssets().openFd("440.wav"); // 440Hz sine wave
InputStream is = afd.createInputStream();
TarsosDSPAudioFormat audioFormat = new TarsosDSPAudioFormat(
  /* sample rate */ 44100,
  /* HERE sample size in bits */ 32,
  /* number of channels */ 1,
  /* signed/unsigned data */ true,
  /* big-endian byte order */ false
);
AudioDispatcher dispatcher = new AudioDispatcher(new UniversalAudioInputStream(is, audioFormat), 2048, 0);
PitchDetectionHandler pdh = ...
AudioProcessor p = new PitchProcessor(PitchProcessor.PitchEstimationAlgorithm.FFT_YIN, 44100, 2048, pdh);
dispatcher.addAudioProcessor(p);
new Thread(dispatcher, "Audio Dispatcher").start();
于 2017-08-14T10:45:58.047 回答