分贝声级计为Android [英] Decibel Sound Meter for Android

问题描述

我是新来的安卓并希望写的测量分贝声级的应用程序。这个想法是，当声音达到一定程度的用户得到一个警报。而已。谁能帮我出这一点。我能做到这一点使用HTML5 / Javascript的？任何帮助将AP preciated。

I am new to Android and looking to write an app for measuring decibel sound level. The idea is that when a sound reaches a certain level the user gets a alert. That's it. Can anyone help me out with this. Can I do this using HTML5/Javascript ? any help will be appreciated.

推荐答案

从 Android的媒体播放器分贝阅读

有关原生Android / Java的基础分贝计算的MediaRecorder：

For native android/java based decibel calculation for a MediaRecorder:

mRecorder = new MediaRecorder();
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mRecorder.setOutputFile("/dev/null"); 
mRecorder.prepare();
mRecorder.start();
   public double getAmplitude() {
            if (mRecorder != null)
                    return  (mRecorder.getMaxAmplitude());
            else
                    return 0;

    }

要计算dB值：

  powerDb = 20 * log10(getAmplitude() / referenceAmp);

参考：<一href="http://en.wikipedia.org/wiki/Decibel#Field_quantities">http://en.wikipedia.org/wiki/Decibel#Field_quantities

不知道，如果你能做到这一点的HTML5在Android

Not sure if you could do this in HTML5 on android

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