[Q] App that turns off microphone AGC (Auto-Gain Control)?

huggs said:

I searched around the mkt, and couldn't find anything other than recording apps, paid or free, that even mention the AGC either. Kinda surprising.

Sent from my HTC HD2 using XDA App

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I found that in Android 2.2 (and higher), they introduced an undocumented flag in the AudioRecord() class, called “VoiceRecogntionQuality”. In the code, there is a note to expose and document that flag (it just hasn’t been done yet.) So I expect that it is supported (and will continue to be.) My guess is that AGC was added to 2.2 and this is the flag that disables it.

Here’s the code I used to adjust my recordings for it:

// We use our version to attempt "VoiceRecogntionQuality" recordings (to disable AGC)
int version = Integer.parseInt(android.os.Build.VERSION.SDK);

// Try to get the audio record for Android 2.2 and greater using 'voice recognition quality'
if (version >= 7)
{
recordInstance = new AudioRecord(6, m_frequency, m_channelConfiguration, m_audioEncoding, bufferSizeBytes * m_bufferCount);
}

// For older versions of Android (or failed attempts of the voice recognition quality recordings)
if (version < 7 || recordInstance.getState() == AudioRecord.STATE_UNINITIALIZED)
{
recordInstance = new AudioRecord(MediaRecorder.AudioSource.MIC, m_frequency, m_channelConfiguration, m_audioEncoding, bufferSizeBytes * m_bufferCount);
}

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santu71182 said:

can we request the programmer you'd contacted to write a small app for us to just enable/disable AGC? We can assure him of buying some beer/coffee

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