Question

我正在尝试使用TarsosDSP库来检测.wav文件中的音高，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。我的代码有什么问题吗？

Answer 1

嗯，我不知道你使用的是什么方法，但通过查看频率如何精确减半，可能是设置错误采样率的问题？

大多数操作假设信号被采样时的初始采样率，也许你已经将它作为参数传递（或者它的默认值是）的一半？

Answer 2

我在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，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();

来自.wav文件的TarsosDSP音高检测。结果频率总是不到一半

2 个答案: