Am Mo 22. September 2008 schrieb Andy Green: > Somebody in the thread at some point said: > | Is there any way to switch the audio path to some file output? > | i.e. can I (potentially) record "buzz" without an active GSM connection > | ( while irradiating the phone from an external HF source ) > | would be cheaper and easier to set up that way. > > Werner pointed out yesterday to a guy asking the same thing that > > /usr/share/openmoko/scenarios/capturehandset.state > > should be the thing. > > As far as I know, nobody yet tested this with buzz and so confirmed that > the effective buzz problem actually comes at the MIC inputs to WM8753. I actually did in TPE, with arecord piped thru STDOUT->ssh-> aplay on PC instead of aplay on PC, you could use "cat >file.wav" Ah, right: result was we get noise when applying RF from external phone.
> > | <someone> > |> Well maybe luckily we *might* eventually find a magic place for a > (33pF) C > |> somewhere near Wolfson chip, to rework GTA02 out in the field this way. > |> Anyway I'd rather expect this magic fix to be found by try and > error, rather > |> than probing on a setup that's completely changed by mere applying a > probe to > |> it. > | > | Could someone with the device open place 100Ohm resistor in series with > | 3/4pF from the mic line to GND and test it? ( instead of the ferrite > bead. > | > | Is the trace in the top layer of the pcb or is it burried? All traces shielded between GND and VDD planes, for 99% of their length (obviously doesn't apply for pads) > > I don't have gerber layer data, but the bead was placed in series with > headphone jack p4, it should be possible to try. > > But I don't have 3.. 4 pF caps lying around, I order some for tomorrow. > > -Andy > /j
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