Thank you,
Please send your address to me privately, and I will send you the
necessary stuff for connecting a battery.
Klas.
At 23:00 2012-03-22, you wrote:
>I opened the file in Audacity and viewed the frequency analysis. It
>looks way better than mine, without the little spikes every 400Hz.
>
>If I view the spectrogram (FFT window size 1024), I can see a few
>bands clearly at 2.4k, 3.7k and 8k, maybe this is some sort of
>environmental noise, very faint but fairly constant through the recording.
>
>I can also see other faint bands that might be evenly spaced like
>mine, but very faint and coming and going, perhaps corresponding
>with you moving the recorder around. If mine had been that faint
>then I would never have noticed them. I didn't try to establish
>their frequencies because they're so faint and I think I'd have to
>enhance them somehow first.
>
>I've attached a screen dump, with black dots added where I think I see a b=
and.
>
>I've never looked this closely at recordings from other microphones
>I have access to (ME66 and M10 internals), and maybe I'd see
>something similar and faint with those too. It's as you described,
>looking at a Rembrandt with an xray machine, but in this case also
>an xray machine in the hands of a beginner - I don't know if my
>tests are valid or meaningful.
>
>But as others have pointed out elsewhere, the M10's PiP isn't able
>to supply as much voltage to 4 capsules as the LS11, so perhaps your
>mics will do a little worse with it. I'm still blaming poor wiring
>for at least some of my problems, but until I try the battery box I won't =
know.
>
>Peter Shute
>
>----------
>From: Klas Strandberg
>Sent: Friday, 23 March 2012 7:16 AM
>To: Peter Shute
>Subject: RE: [Nature Recordists] New Telinga SoundScapeMic
>Peter,
>I put a 10s .wav file on top of the Telinga Demo site.
>Please download and analyze in the same way as you did when you
>discovered your problems.
>I hold the mic capsules as close that I can near the display.
>Klas
>
>At 03:19 2012-03-22, you wrote:
>>That's an excellent idea. I think one of either Avisoft or Raven
>>can do real time sonograms, or maybe even Audacity. I'll set it up
>>and try some real time monitoring goijng.
>>
>>But merely keeping the recorder further away is probably good
>>enough for now. I was concerned that the low voltage might be
>>causing other problems I didn't know about, so I won't worry so
>>much about that now.
>>
>>Peter Shute
>>----------
>>From: Klas Strandberg [
>>Sent: Thursday, 22 March 2012 12:50 PM
>>To: Peter Shute
>>Subject: RE: [Nature Recordists] New Telinga SoundScapeMic
>>I wish I had some good ideas Peter.
>>If you were here, we would start by placing the recorder at one
>>place and the mic nearby and see if there is a way to monitor the
>>disturbance in real time.
>>Then connect a metal mesh to ground and move the mesh around to see
>>what happens.
>>And connect a alu-foil to ground and put it on the display.
>>Such things.
>>You are welcome to mail me in private, if you like.
>>Klas.
>>
>>
>>
>>At 02:27 2012-03-22, you wrote:
>>>Definitely not random. With 4 connected, it picked up interference
>>>strongly, presumably square wave because it appeared as evenly
>>>spaced band when I looked at the sonogram. It did this every time
>>>the recorder was close to the mics, and I noticed it because in my
>>>first test I placed the recorder right on top of the SASS box.
>>>
>>>It was suggested it might be because the voltage was too low. I
>>>measured it at about 0.5V, and disconnected two of them. At 1.3V
>>>it now still picks up the interference, but nowhere near as
>>>strongly. It's mainly in one channel, the one with the cable
>>>running across the box to the other side.
>>>
>>>Both recordings sounded ok to me, although someone said they could
>>>hear a hum on the one made with 4 capsules.
>>>
>>>It is possible that there's a faulty capsule, now disconected. I
>>>haven't tried just the other pair yet.
>>>
>>>It might be that in normal use people keep their recorder much
>>>further from the mics, and use much better quality cable than I
>>>did. In order to get it together quickly I used cables recovered
>>>from damaged cheap earphones, etc, and I doubt the shielding is much goo=
d.
>>>----------
>>>From: Klas Strandberg [
>>>Sent: Thursday, 22 March 2012 12:12 PM
>>>To: Peter Shute
>>>Subject: RE: [Nature Recordists] New Telinga SoundScapeMic
>>>Hi Peter!
>>>I cannot explain that two em172 took up more of disturbances than
>>>one. Can it be random?? There are many factors involved here, not
>>>only the driving voltage.
>>>The prototypes of the Telinga SSM has been made out of plastic
>>>only and no special shielding.
>>>The commercial ones will be out of aluminium.
>>>Klas
>>>At 05:00 2012-03-21, you wrote:
>>>>Klas, my recent trial of 2 pairs of EM172s powered by the Sony
>>>>M10's PiP sounded ok, but the recording revealed interference
>>>>from the M10 (the display?) that is much reduced in a recording
>>>>made with just one pair of EM172s. It was suggested that trying
>>>>to drive the four capsules made them more sensitive to this
>>>>interference, and I'm building a battery box to test that.
>>>>
>>>>So your array might be more sensitive to interference? You've
>>>>likely shielded it far better than I did, but could it be an issue?
>>>>
>>>>Peter Shute
>>>>----------
>>>>From: [
>>>> On Behalf Of Klas Strandberg
>>>>Sent: Wednesday, 21 March 2012 1:49 PM
>>>>To:
>>>>Subject: [Nature Recordists] New Telinga SoundScapeMic
>>>>Hello!
>>>>After my last posting, see below, I have got questions about the new
>>>>SoundScapeMic and Zoom / Sony Plug in power.
>>>>Here are my results from measuring and listening:
>>>>The driving voltage was taken from a variable power supply, filtered
>>>>by 150 Ohms and 470 mfd to ground, then 2,2 kOhms to the drains of
>>>>two EM172. The output was connected to the recorder input via a 1 mfd
>>>>tantalum condenser. The recorders PIP voltage was "off".
>>>>The mics were placed in front of loudspeaker giving 100db SPL at 440
>>>>Hz. sine wave.
>>>>For reference: 100 db SPL and 1v driving voltage =3D 0db output.
>>>>I could not measure distortion, but the sine wave at the oscilloscope
>>>>looked fine.
>>>>Measurements were made at 0,5v / 0,7v / 1v /2v and 3volts.
>>>>The output from the mics were less than 5 db more at 3v than at 0,5v
>>>>and the mic self noise followed.
>>>>Conclusion: Two EM172 give a higher output at a higher driving
>>>>voltage, but the noise follows the output.
>>>>So two em172 / channel will work fine on PIP with all modern
>>>>recorders and there seems is be no need to build extra boxes with
>>>>9v batteries.
>>>>Klas
>>>>As I have posted on the Naturerecordist list a number of times, I
>>>>have been intensely busy designing a new mic system especially
>>>>calibrated for SoundScapes. This odyssey began
>>>>at the 2009 Murie Center Workshop that Bernie, Martyn, and Kevin put
>>>>together in Wyoming.
>>>>While the early designs had some spatial and imaging issues, this new
>>>>system is spot on!
>>>>Please visit <http://klas.telinga.com/demo>http://klas.telinga.com/demo
>>>>(All recordings done with Olympus LS-11 on High sens, 8 to 10 on the
>>>>wheel and 24bit.)
>>>>Frankly, I love this mic! Main features: It is light-weight, easy to
>>>>use, small to pack down in a suitcase, not sensitive to wind and
>>>>handling noise and runs very low noise on PlugInPower.
>>>>The sound character is big and transparent. Listening to the sound, I
>>>>lean back and relax, undisturbed by too much of side, harsh or
>>>>metallic coloring.
>>>>Sitting in the bush, monitoring with my Beyer headphones, taking the
>>>>Beyer's on and off, comparing the sound I get from the mics with what
>>>>I hear with my ears only, - it's the
>>>>only stereo rig so far that gives me a realistic sound image of wind.
>>>>I especially love the ambient sounds of the forest. The forest is big
>>>>and the acoustic imaging is as real as it gets.
>>>>Hope you enjoy!
>>>>Klas
>>>>Telinga Microphones, Botarbo,
>>>>S-748 96 Tobo, Sweden.
>>>>Phone & fax int + 295 310 01
>>>>email: <telinga%40bahnhof.se>
>>>>website: www.telinga.com
>>>>
>>Telinga Microphones, Botarbo,
>>S-748 96 Tobo, Sweden.
>>Phone & fax int + 295 310 01
>>email:
>>website: www.telinga.com
>>
>Telinga Microphones, Botarbo,
>S-748 96 Tobo, Sweden.
>Phone & fax int + 295 310 01
>email:
>website: www.telinga.com
>
>Telinga Microphones, Botarbo,
>S-748 96 Tobo, Sweden.
>Phone & fax int + 295 310 01
>email:
>website: www.telinga.com
>
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email:
website: www.telinga.com
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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