Thread: Recording problem using different applications.
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ontime is offline ontime
2017-07-03 , 17:38
Posts: 29 | Thanked: 88 times | Joined on Oct 2015
#18
I have noticed that when sim card is "active" clicking noise has higher frequency; when the phone is in offline mode this frequency is lower
If audio04.m4a and audio05.m4a was recorded by build in mic or headset mic? How do you recognize if sim card is active or not? Are you meaning active sim card as gsm online or making call / send / receive sms?

source.voice (hardware dsp)
source.record
Do you know what is the difference in parameters and quality of recorded sound using these sources? And why source.voice has hardware dsp support and others have not?
I think source.voice has 8000kHz by default.
source.record has wider range 8000, 11025, 16000, 22050, 44100, 48000 [kHz] or sth like that.

Why don't you check its quality? You can use gstreamer for that. Source.voice is optimized for better understanding human voice through gsm transmision and maybe for some background noise cancellation.

Is this a setting for all types of recording source(that is - microphone) ? What is the default value of this parameter?
default is 0, I think. It's for headset mic and fm radio at least.

Has N900 option to use AGC in recording? And how to turn it on?
yes, is has
Code:
amixer -qc0 cset name='AGC Switch' on
amixer -qc0 cset name='AGC Switch' off
or you can find it in
Code:
alsamixer -c0
can be changed by 'm' key
 

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