Thread: Recording problem using different applications.
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ontime is offline ontime
2017-07-05 , 16:39
Posts: 29 | Thanked: 88 times | Joined on Oct 2015
#21
It was recorded by build-in mic. Active means gsm online. I didn't test recording during making call yet.
It's strange, because none of my N900 doesn't do that clicking noise. Maybe is it some hardware issue? I don't know. You can also ask at freenode irc channel #maemo https://webchat.freenode.net/

Could you, please, explain how to use gstreamer to test quality of recording. And what quality means - parameters of recordng (for example - sample frequency) or levels, oversteering etc.?
Let's make two files (record your voice each time). First file will have 8kHz sample frequency and second 44.1kHz. Probably both will have the same depth 12bits or what N900 sound card has.
Code:
gst-launch-0.10 -e pulsesrc device=source.record ! audio/x-raw-float,channels=1 ! audioconvert ! nokiaaacenc bitrate=64000 output-format=0 ! hantromp4mux ! audio/x-m4a ! filesink location=/home/user/MyDocs/audio_source_record.m4a
gst-launch-0.10 -e pulsesrc device=source.voice ! audio/x-raw-float,channels=1 ! audioconvert ! nokiaaacenc bitrate=64000 output-format=0 ! hantromp4mux ! audio/x-m4a ! filesink location=/home/user/MyDocs/audio_source_voice.m4a
I'm sure, you'll immediately notice difference in quality. But if you want measure noise level, you can use audacity for example. It'll give you noise level in dB - one parameter of sound quality.
 

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