Android的 - 如何在录制时添加增益控制 [英] Android - how to add gain control when recording

问题描述

我的录音机应用工作，并想补充增益控制，但我不知道该怎么做。我有机会获得音频缓冲区，但我不知道如何使声音变得更大或更慢。
我看到另外一个应用程序，对来自特定范围内选择的分贝搜索栏。

I work for an audio recorder app and would like to add gain control but I don't know how to do it. I have access to audio buffer but I don't know how to make the sound louder or slower. I see another apps that have a seekBar for selecting the decibels from a specific range.

aRecorder.read(buffer, 0, buffer.length);
fWriter.write(buffer); // Write buffer to file

请告诉我，我应该怎样做来实现增益控制在我的应用程序。

Please tell me what should I do to implement gain control in my app.

感谢。

推荐答案

改变音量很简单，只要乘以某一分数所有样品。的+/-3分贝（分贝）的变化相当于2或0.5分别乘（请参见的http：// EN .wikipedia.org /维基/分贝）。在输出prevent的不连续性，确保你从开始到结束平滑地改变倍增因子。

Changing the volume is simple, just multiply all the samples by some fraction. A change of +/- 3dB (decibels) corresponds to multiplication by 2 or 0.5 respectively (see http://en.wikipedia.org/wiki/Decibel). To prevent discontinuities in the output, make sure that you vary the multiplication factor smoothly from beginning to end.

请参阅AudioSampleBuffer :: applyGainRamp（）@ http://www.rawmaterialsoftware.com/api/ classAudioSampleBuffer.html

See AudioSampleBuffer::applyGainRamp() @ http://www.rawmaterialsoftware.com/api/classAudioSampleBuffer.html

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