android AudioRecord amplitude reading from MIC
14,559
Try using a higher sampling rate. The maximum is 48000, but 44100 is standard.
Also, it is possible the microphone is just recording background noise.
Author by
user591124
Updated on June 08, 2022Comments
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user591124 almost 2 years
I am trying to record the sound from the MIC and draw a live graph. I am able to record and draw the graph. The problem is the values that are recorded using the code below are not accurate for example ... the image below is what i get when there is no sound at all present. I have seen examples using the fft but I am noot sure if that will be of any help in my case as I am trying to draw a time domain graph and I see no purpose to convert it to frequency domain (for now). Others are using average power, this might be helpful but I am not sure.
Thanks for any help.
bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,RECORDER_CHANNELS,RECORDER_AUDIO_ENCODING); recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, RECORDER_SAMPLERATE, RECORDER_CHANNELS,RECORDER_AUDIO_ENCODING, bufferSize); short data [] = new short[bufferSize]; while (!Thread.interrupted()) { recorder.startRecording(); recorder.read(data, 0, bufferSize); recorder.stop(); for (short s : data) { try { Thread.sleep((long) 300.00); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } postUI (Math.abs(s)); } } recorder.release();