改变音高录制的音频和频率 [英] Changing Pitch and Frequency of Recorded Audio

问题描述

我一直在试图用code从以下调整记录一段音频的音调：

http://developer.android.com/guide/topics/媒体/音频capture.html

我的猜测是，这一调整应与完成的 MediaRecorder 。

http://developer.android.com/reference/android/media/ MediaRecorder.html

不过，我不能确定打电话来改变音调哪种方法？

翻翻所以，我发现<一href="http://stackoverflow.com/questions/3737636/changing-the-frequency-of-a-soundfile-in-android">changing在Android的一个音效档的频率，但我很困惑，如何整合的Soundpool 与我下面的音频捕获导向的元素。有基于开发指南我使用的是更简单的解决方案？

解决方案

  mAudioManager =（AudioManager）context.getSystemService（Context.AUDIO_SERVICE）;
mSoundPool =新的Soundpool（大小，AudioManager.STREAM_MUSIC，0）;
mSoundPoolMap =新的HashMap＆LT;整数，整数GT;（）;
mSoundPoolMap.put（索引，mSoundPool.load（上下文，R.raw.sound，1））;


mSoundPool.play（ID，streamVolume，streamVolume，1，循环，1F）;
 

的频率是第1f一部分。如果您将其更改为.5f和2.0f之间的值，应该减速或加速样本，从而改变音高。

下面是从我的应用程序之一约code：

 私人的Soundpool的Soundpool;
    私人的HashMap＆LT;整数，整数GT; soundsMap;

    保护无效的onCreate（包savedInstanceState）{

的Soundpool =新的Soundpool（4，AudioManager.STREAM_MUSIC，1​​00）;
        soundsMap =新的HashMap＆LT;整数，整数GT;（）;
        soundsMap.put（cowbell1，soundpool.load（此，R.raw.cowbell，1））;
        soundsMap.put（cowbell2，soundpool.load（此，R.raw.cowbell1，1））;
        soundsMap.put（cowbell3，soundpool.load（此，R.raw.windhh3，1））;

}

    公共无效playSound（INT声音，浮动fSpeed​​）{
    AudioManager经理=（AudioManager）getSystemService（Context.AUDIO_SERVICE）;
    浮streamVolumeCurrent = mgr.getStreamVolume（AudioManager.STREAM_MUSIC）;
    浮streamVolumeMax = mgr.getStreamMaxVolume（AudioManager.STREAM_MUSIC）;
    浮动量= streamVolumeCurrent / streamVolumeMax;
    soundpool.play（soundsMap.get（音），音量，音量，1，0，fSpeed​​）;
   }
 

要叫我用这样的声音：

  playSound（cowbell1，1.0F）;
要么
                playSound（cowbell2，1.0F）;
 

的速率可以通过改变1.0F值被改变。

如果您仍然有后您的code麻烦，我会看看吧。

I've been trying to adjust the pitch of a record piece of audio following with code from:

http://developer.android.com/guide/topics/media/audio-capture.html

My guess is that this adjustment should be done with the MediaRecorder.

http://developer.android.com/reference/android/media/MediaRecorder.html

However, I am unsure which method to call to change the pitch?

Looking through SO, I found changing the frequency of a soundfile in android but I am confused as to how to integrate a SoundPool with the elements in the audio capture guide I am following. Is there a more straightforward solution based on the developer guide I am using?

解决方案

mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
mSoundPool = new SoundPool(size, AudioManager.STREAM_MUSIC, 0);
mSoundPoolMap = new HashMap<Integer, Integer>();
mSoundPoolMap.put(index, mSoundPool.load(context, R.raw.sound, 1));


mSoundPool.play(id, streamVolume, streamVolume, 1, loop, 1f);

The frequency is the 1f part. If you change it to a value between .5f and 2.0f that should slow down or speed up the sample, which changes the pitch.

Here's some code from one of my apps:

    private SoundPool soundpool; 
    private HashMap<Integer, Integer> soundsMap;

    protected void onCreate(Bundle savedInstanceState) {

soundpool = new SoundPool(4, AudioManager.STREAM_MUSIC, 100);
        soundsMap = new HashMap<Integer, Integer>();
        soundsMap.put(cowbell1, soundpool.load(this, R.raw.cowbell, 1));
        soundsMap.put(cowbell2, soundpool.load(this, R.raw.cowbell1, 1));
        soundsMap.put(cowbell3, soundpool.load(this, R.raw.windhh3, 1));

}

    public void playSound(int sound, float fSpeed) {
    AudioManager mgr = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
    float streamVolumeCurrent = mgr.getStreamVolume(AudioManager.STREAM_MUSIC);
    float streamVolumeMax = mgr.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
    float volume = streamVolumeCurrent / streamVolumeMax;  
    soundpool.play(soundsMap.get(sound), volume, volume, 1, 0, fSpeed);
   }

To call a sound I use this:

                playSound(cowbell1, 1.0f);
or 
                playSound(cowbell2, 1.0f);

The rate can be changed by altering the 1.0f value.

If you're still having trouble post your code and I'll have a look at it.

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