Support and General Use > Recording
H10 Pure
Recording Guy:
Yes I am trying to track down the left channel fluctuating signal.
Tested to see if Wolfsson had accidentally left the microphone on when in line mode.
Nope. This is not the case.
What I would like to see ideally is the left channel signal steady at around -84 db like its right signal. I normalised the H10 noise file to see what it is but I can't tell.
If anyone with an H10 could go into record pause mode (line, pcm 44.1khz, no cable connected) and see if they get that fluctuating signal that would be great. Maybe my unit has a knackered ADC chip or something.
Thanks.
saratoga:
--- Quote from: Recording Guy on March 01, 2010, 05:38:23 AM ---Yes I am trying to track down the left channel fluctuating signal.
--- End quote ---
You don't have anything connected. Its just a floating input, which is floating around. Hook up a source and see if theres actually a problem recording.
Recording Guy:
Ah, floating, okay cheers. bits are on order.
Interesting to note that gain will go down to -34.5db, could be handy for gear that puts out
+4db signal. Will let you know how it goes.
BTW this is Rockbox 3.5 latest, on Firmware v1.7ep MTP and everything is steady as a rock.
Scroll wheel works great, no lockups or shutdown freeze.
Recording Guy:
Well got the bits to make a cable for the H10, those pins are TINY, anyways managed it.
Had to wire up 8 wires (including earths for a stereo insert/return cable), and it seems that the
Cradle detect does need to be bridged with a bit of solder (next to it is an Earth pin luckily).
Still got the same noise on the left channel with the cable linked up. All permutations tried, changed the recording meter to show % instead of DB and the noise disappeared (from the display..looked encouraging)
Recorded though and the noise was still present on the wave file.
Do you think it must be a hardware thing (Wolfson? IRiver?)
It still seems to be "Floating" though the cable is well earthed...
I think this "blipping" noise was also reported on the Ipods as well. See Link Below:
http://www.rockbox.org/tracker/6989
EDIT:
Ok managed to do a line recording with the Iriver original software, only does 320kb MP3 max,
and I can confirm that the floating blipping signal is present on the left channel, so it isn't the (excellent) Rockbox software.
I know this isn't the Harware forum, but would anyone like to hazard a guess as to what it could be?
I would be prepared to risk "bricking" it in the interests of solving the problem if it only required a little bridging solder or something or a pin pulldown, in the interests of the Rockbox community that may like to record an ant squirting formic acid or a butterfly taking off.
-85 is fine but -78 may compromise some microphones for capturing very quiet sounds.
Recording Guy:
Just updating this thread for anyone making a cable.
the Cable Detect pin does not need to be bridged to earth if only using Rockbox.
If you boot up to original firmware, it will say "put the thing on the cradle" but since the Rockbox software
outclasses the original, can't see much point in using it.
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