> As a passive (but passionate) reader of this mailing list, I have been
> waiting to present you a sample of my recordings. Not all of it is the
> regular nature recording, so beware!
>
> I would love to hear some comments / tips / criticism!
Jonas,
I'll try to give an account of what I hear. I've re-recorded the tracks so =
I
can look at the spectrum etc.
I would be very surprised if anyone could hear MP3 artefacts over the
natural backgrounds on these recordings or recognise a drop in quality from=
the re-recording. Slow MP3 sampling rates do affect the stereo image, and
the digital recording industry appears to cope well at realistic MP3
sampling rates.
The equivalent of a "Turing Test" would be to play a high quality recording=
from a high rate WAV to commonly used MP3 settings and see who can tell
which is which - and guess the sample rates. There is a lot of bluffing in=
the sound business - I know, I used to be in it. :-)
Anyway, back to the recordings.
> Microphones placed in the grass on the meadow
> https://soundcloud.com/jonas-gruska/microphones-in-the-grass
One insect is prominent but placed to the right, with a high background at=
around -24dB. This sounds like wind in trees but is not clear stereo,
perhaps behind the mic array. The wind is also rustling the close grass. I=
tried panning the loud insect a bit more centrally (30% left on Audacity)
but the other sounds didn't match up well. There is a very prominent bass
peak on the background spectrum with a 100Hz maximum which doesn't
contribute to the insect sounds even with a bass roll-off.
> Microphones placed in a bird-feeder
> https://soundcloud.com/fields-by-gruska/bird-feeder
Bass wind noise at start. Stereo background sounds OK including dog whining=
which set it in a garden. Bird wingbeats and other sounds have a good stere=
o
spread. It would also be good accompanying a video of the bird table.
However, there is a bass booming probably coming from the wind and traffic.=
Direct wind noise is prominent in the first 30 seconds and this also shows=
up a strong resonant peak at 75Hz with a strong bass cut at around 24dB per=
octave below that.
From 60 sec for half a minute there is a prominent resonant peak around
600Hz making a drumming sound which can also be heard in the rest of the
recording. The background traffic and a dog or dogs are primarily to the
right and are not necessarily a problem in a garden context.
> Binaural walk in Bratislava (starts in house)
> https://soundcloud.com/fields-by-gruska/binaural-walk-in-bratislava
I presume this is the same head worn binaural array as the resonances are
similar, a very prominent peak around 100 Hz and a very steep bass cut whic=
h
is very noticeable in the lift.
The stereo image is good as the head moves, with a clear transition to
outdoors, then the sound of a gate. There are resonances outside above 100H=
z
but nowhere as pronounced as in the bird table recording. However, the
geography is confused when the gate is closed because of the head turning.=
Booming from peaks in the 40Hz to 100Hz region continue in the town and
traffic noise. Some peaks can be expected when passing reflective surfaces.=
100Hz corresponds to a reflection about 1.7 metres away.=09
When stepping indoors at the end, the resonances remain and one spectrum
gives sharp peaks at 75Hz, 160Hz, 320Hz and so on suggesting a series of
reflections or corridor resonances and their harmonics.
However, the stereo image is good in free air with sound objects having
clearly placed image points.
> Binaural trolleybus ride
> https://soundcloud.com/jonas-gruska/koliba-hodzovo-namestie-binaural-trol=
leybus-recording
You would expect resonances inside a trolleybus so these were not
distracting. The bass cut was not used for the recording and the bass
spectrum tip-up was all there at about 8 dB per octave. Levelling this usin=
g
my favourite gradual bass roll-off (I can give the Audacity parameters) gav=
e
a more comfortable sound.
As before, the stereo image was good, creaks and rattles and all.
> Tram crossroad from ants perspective
> https://soundcloud.com/fields-by-gruska/tram-crossroad-from-ants-perspect=
ive
I presume you were not wearing the mic rig on your head. :-) I got a
different stereo image - not as clear and the siren(?) at around 45secs was=
not placed at all well, but it had no tranients so that was to be expected.=
I got left to right movements OK but not the good general stereo picture of=
the other tracks.
Hope that helps.
David Brinicombe
"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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