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Android Dev: High noise floor on audio recordings on Samsung Galaxy S6

Noise reduction and compression in streaming audioChange Android Audio Record Default input SourceAppropriate audio capture and noise reductionAndroid AudioRecord Initialization delayAndroid MediaRecorder/Player Either Not Recording or Not PlayingMediaRecorder.AudioSource.VOICE_RECOGNITION is available or notAndroid MediaRecorder record voice only, not outputIs there any way to have multiple audio recorders at the same time?Recording audio without noisestartRecording() called on an uninitialized AudioRecord

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0

I am building an app to analyze voice quality.The user makes a voice recording which is stored on the device and then sent to a server for analysis.

I recently noticed that all audio recordings from Samsung Galaxy S6 (G920-F) are much noisier than other tested Android devices. I need to support the Galaxy S6 as I have many users on this phone.

I an attempt to fix the issue I tried testing MediaRecorder with different Audiosources such as: DEFAULT, MIC, VOICE_RECOGNITION and VOICE_COMMUNICATION. None of these options have a significant impact on noise.

I then tested using AudioRecorder with the same AudioSources listed above. No improvement.

Finally I tried adding a NoiseSuppressor to AudioRecorder which showed very little to no improvement.

I am setting up the AudioRecorder and NoiseSuppressor as follows:

public void startRecording(String fileNameIn) {
 bufferSize = AudioRecord.getMinBufferSize (
 RECORDER_SAMPLERATE,
 RECORDER_CHANNELS,
 RECORDER_AUDIO_ENCODING);
 aRecorder = new AudioRecord(
 MediaRecorder.AudioSource.VOICE_RECOGNITION,
 RECORDER_SAMPLERATE,
 RECORDER_CHANNELS,
 RECORDER_AUDIO_ENCODING,
 bufferSize);

 int audioSession = aRecorder.getAudioSessionId();
 enableNoiseSuppressor(audioSession);


 aRecorder.startRecording();
 ......

and

public void enableNoiseSuppressor(int microphoneId) 
 if (NoiseSuppressor.isAvailable() && noiseSuppressor == null) 
 noiseSuppressor = NoiseSuppressor.create(microphoneId);
 noiseSuppressor.setEnabled(true);
 Log.i(TAG, "NoiseSuppressor enabled");
 else 
 Log.e(TAG, "This device don't support NoiseSuppressor");
 
 

I also tested 3rd party recording apps on the Galaxy S6 and notice a high noise level on these recordings as well. This seems like a strange problem to have from a flagship (a few years back) phone. Are there any Android tricks or core concepts I am missing?

Looking for any suggestions or advice.

android audio-recording samsung-mobile noise-reduction

share|improve this question

asked Mar 24 at 14:18

Kevin KKevin K

11

add a comment | 

0

I am building an app to analyze voice quality.The user makes a voice recording which is stored on the device and then sent to a server for analysis.

I recently noticed that all audio recordings from Samsung Galaxy S6 (G920-F) are much noisier than other tested Android devices. I need to support the Galaxy S6 as I have many users on this phone.

I an attempt to fix the issue I tried testing MediaRecorder with different Audiosources such as: DEFAULT, MIC, VOICE_RECOGNITION and VOICE_COMMUNICATION. None of these options have a significant impact on noise.

I then tested using AudioRecorder with the same AudioSources listed above. No improvement.

Finally I tried adding a NoiseSuppressor to AudioRecorder which showed very little to no improvement.

I am setting up the AudioRecorder and NoiseSuppressor as follows:

public void startRecording(String fileNameIn) {
 bufferSize = AudioRecord.getMinBufferSize (
 RECORDER_SAMPLERATE,
 RECORDER_CHANNELS,
 RECORDER_AUDIO_ENCODING);
 aRecorder = new AudioRecord(
 MediaRecorder.AudioSource.VOICE_RECOGNITION,
 RECORDER_SAMPLERATE,
 RECORDER_CHANNELS,
 RECORDER_AUDIO_ENCODING,
 bufferSize);

 int audioSession = aRecorder.getAudioSessionId();
 enableNoiseSuppressor(audioSession);


 aRecorder.startRecording();
 ......

and

public void enableNoiseSuppressor(int microphoneId) 
 if (NoiseSuppressor.isAvailable() && noiseSuppressor == null) 
 noiseSuppressor = NoiseSuppressor.create(microphoneId);
 noiseSuppressor.setEnabled(true);
 Log.i(TAG, "NoiseSuppressor enabled");
 else 
 Log.e(TAG, "This device don't support NoiseSuppressor");
 
 

I also tested 3rd party recording apps on the Galaxy S6 and notice a high noise level on these recordings as well. This seems like a strange problem to have from a flagship (a few years back) phone. Are there any Android tricks or core concepts I am missing?

Looking for any suggestions or advice.

android audio-recording samsung-mobile noise-reduction

share|improve this question

asked Mar 24 at 14:18

Kevin KKevin K

11

add a comment | 

I am building an app to analyze voice quality.The user makes a voice recording which is stored on the device and then sent to a server for analysis.

I recently noticed that all audio recordings from Samsung Galaxy S6 (G920-F) are much noisier than other tested Android devices. I need to support the Galaxy S6 as I have many users on this phone.

I an attempt to fix the issue I tried testing MediaRecorder with different Audiosources such as: DEFAULT, MIC, VOICE_RECOGNITION and VOICE_COMMUNICATION. None of these options have a significant impact on noise.

I then tested using AudioRecorder with the same AudioSources listed above. No improvement.

Finally I tried adding a NoiseSuppressor to AudioRecorder which showed very little to no improvement.

I am setting up the AudioRecorder and NoiseSuppressor as follows:

public void startRecording(String fileNameIn) {
 bufferSize = AudioRecord.getMinBufferSize (
 RECORDER_SAMPLERATE,
 RECORDER_CHANNELS,
 RECORDER_AUDIO_ENCODING);
 aRecorder = new AudioRecord(
 MediaRecorder.AudioSource.VOICE_RECOGNITION,
 RECORDER_SAMPLERATE,
 RECORDER_CHANNELS,
 RECORDER_AUDIO_ENCODING,
 bufferSize);

 int audioSession = aRecorder.getAudioSessionId();
 enableNoiseSuppressor(audioSession);


 aRecorder.startRecording();
 ......

and

public void enableNoiseSuppressor(int microphoneId) 
 if (NoiseSuppressor.isAvailable() && noiseSuppressor == null) 
 noiseSuppressor = NoiseSuppressor.create(microphoneId);
 noiseSuppressor.setEnabled(true);
 Log.i(TAG, "NoiseSuppressor enabled");
 else 
 Log.e(TAG, "This device don't support NoiseSuppressor");
 
 

I also tested 3rd party recording apps on the Galaxy S6 and notice a high noise level on these recordings as well. This seems like a strange problem to have from a flagship (a few years back) phone. Are there any Android tricks or core concepts I am missing?

Looking for any suggestions or advice.

android audio-recording samsung-mobile noise-reduction

share|improve this question

asked Mar 24 at 14:18

Kevin KKevin K

11

public void startRecording(String fileNameIn) {
 bufferSize = AudioRecord.getMinBufferSize (
 RECORDER_SAMPLERATE,
 RECORDER_CHANNELS,
 RECORDER_AUDIO_ENCODING);
 aRecorder = new AudioRecord(
 MediaRecorder.AudioSource.VOICE_RECOGNITION,
 RECORDER_SAMPLERATE,
 RECORDER_CHANNELS,
 RECORDER_AUDIO_ENCODING,
 bufferSize);

 int audioSession = aRecorder.getAudioSessionId();
 enableNoiseSuppressor(audioSession);


 aRecorder.startRecording();
 ......

public void enableNoiseSuppressor(int microphoneId) 
 if (NoiseSuppressor.isAvailable() && noiseSuppressor == null) 
 noiseSuppressor = NoiseSuppressor.create(microphoneId);
 noiseSuppressor.setEnabled(true);
 Log.i(TAG, "NoiseSuppressor enabled");
 else 
 Log.e(TAG, "This device don't support NoiseSuppressor");
 
 

android audio-recording samsung-mobile noise-reduction

android audio-recording samsung-mobile noise-reduction

share|improve this question

asked Mar 24 at 14:18

Kevin KKevin K

11

share|improve this question

asked Mar 24 at 14:18

Kevin KKevin K

11

asked Mar 24 at 14:18

Kevin KKevin K

11

asked Mar 24 at 14:18

Kevin KKevin K

11