Rich,
Which frequencies are you referring to when you write "high pitched"?
Gerald White
--- In "Rich Peet" <>
wrote:
> In my comparing of various .mp3 settings I have not found a hiss
> generated by the mp3 encoding. I do find in some compressions hiss
> that is more objectionable because there have been more "holes"
blown
> into existing hiss during the encode. For example, linked is a less
> than 10% saturation mono file with the first half being the
original
> wave after being converted to 16bit, and the second half being the
> same sound compressed into a mp3. Compression was 12.6 to 1 or
56kbps
> at a 44.1 khz sample rate with a maximum bandpass of 12,002 cycles.
> Encode by Fraunhofer IIS done within Adobe Audition. I leave it to
> your ears if you find the high pitched hiss worse on the 2nd half
of
> this recording.
>
> In mp3 compression of files I am not a fan of "variable bit rates"
for
> natural sound. All of these vbr methods, I conclude, make artifacts
> worse in quiet recordings.
>
> I would like a new "nature quiet" encode for .mp3. In this I would
> like to see a complete 12,000 cutoff for highs, and 70 cycle for
lows.
> With various choices all in constant bit rate. Then I would also
> prefer that the codex rather than have a pitch eliminated more
pitches
> are effected but at a 6 db level rather than an infinite cut
level.
>
> 2.5 meg download example at:
> http://home.comcast.net/~richpeet/mp3.wav
>
> Rich Peet
>
>
> --- In Klas Strandberg
> <> wrote:
> > Rob, can you make a "hiss" demo with different MP3 settings?? I
am
> > unfamiliar with that sort of hiss. The noise I hear on John's
> recordings
> > sounds like "typical transistor noise".
> >
> > John - can we have a few seconds of the Robin or Coyote
as .wav?? I
> really
> > need to sort this out.
> >
> > Klas.
> >
> > At 03:24 2005-08-01, you wrote:
> > >Thanks John! Love the yotes. Is the first single perhaps
calling for
> > >a \partner thats out of range? She/he is turning and calling
in
> > >different directions right? The sources of three slap back
echos
> > >towards the end are interesting to think about too.
> > >
> > >I believe the widely distributed hiss, waivering and artifacts
are
> > >largely the result of the the mp3 encoding. Its 1:45 long and
> > >requires 1.6mb, so a data rate of 15.6K bytes/sec. Low even for
mp3
> > >standards. An uncompressed file would give us a better sense of
> > >noise, if any, introduced byt the pre. Rob D.
> > >
> > > = = =
> > >
> > >
> > >At 2:55 AM +0200 8/1/05, Klas Strandberg wrote:
> > > >Hi John!
> > > >
> > > >In his "self-noise" debate: Now when I hear your recordings
again
> - after
> > > >getting acquainted with the NT1A, - I think I hear a hiss
which
> does not
> > > >come from the mic.
> > > >
> > > >It could be atmospheric noise (leaves, grass in very minor
wind)
> but it
> > > >sounds electronic. Is it the PMD670 or something else?
> > > >
> > > >Or is this what the NT1A sounds like when it is cold?
> > > >Which temperature did you have?
> > > >I hear it also on the Robin recording. Same "hiss".
> > > >
> > > >Klas.
> > > >
> > > > when I listen to your recordings.At 01:08 2005-08-01, you
wrote:
> > > >>Last weekend I returned to the Aldrich Mountains: this time
we
> stayed
> > > >>at Deer Creek Guard Station. One nice thing about this
forest
> service
> > > >>cabin (and also the one at Murderers Creek) is no
electricity. The
> > > >>lights, refrigerator, and stove run on propane, which does
make some
> > > >>noise but nothing like the annoying hums and buzzes that
come from
> > > >>electrical devices.
> > > >>
> > > >>Just after dark I went out on a walk listening for owl
sounds, but I
> > > >>didn't hear any. A little later as the nearly full moon rose
> from the
> > > >>trees and illumined the meadow, a coyote began beckoning
others to
> > > >>join in chorus. In this recording there are two coyotes,
some
> > > >>crickets, and a mystery bird - any takers? (1.6MB) (PMD670
full
> gain,
> > > >>NT1-As at 60deg and with barrier):
> > > >>
> > > >>http://www.rockscallop.org/ear/jh-050722-nightcoyote.mp3
> > > >>
> > > >>For Rob Danielson's comparisons of recorders and
microphones, he
> > > >>requested examples recorded at full gain. For the PMD-670,
the
> maximum
> > > >>gain is an unimpressive 45dB. Here's a 30 sec example at
dawn
> at full
> > > >>gain.
> > > >>
> > > >>http://www.rockscallop.org/ear/jh-050723-0424_rl10-60dg-
b1.mp3
> > > >>
> > > >>Here's another short example with the levels set at 7 out of
10.
> > > >>
> > > >>http://www.rockscallop.org/ear/jh-050723-0521_rl07-60dg-
b1.mp3
> > > >>
> > > >>Here's another example (PMD670 set at 7) of coyotes joining
in
> chorus
> > > >>around 5:30 am.
> > > >>
> > > >>http://www.rockscallop.org/ear/jh-050723-
0526_coyotechorus.mp3
> > > >>
> > > >>Any comments, questions, or suggestions are welcomed.
> > > >>-John Hartog
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>"Microphones are not ears,
> > > >>Loudspeakers are not birds,
> > > >>A listening room is not nature."
> > > >>Klas Strandberg
> > > >>Yahoo! Groups Links
> > > >>
> > > >>
> > > >>
> > > >>
> > > >
> > > >Telinga Microphones, Botarbo,
> > > >S-748 96 Tobo, Sweden.
> > > >Phone & fax int + 295 310 01
> > > >email:
> > > >
> > > >
> > > >
> > > >
> > > >"Microphones are not ears,
> > > >Loudspeakers are not birds,
> > > >A listening room is not nature."
> > > >Klas Strandberg
> > > >Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >--
> > >Rob Danielson
> > >Film Department
> > >University of Wisconsin-Milwaukee
> > >
> > >
> > >"Microphones are not ears,
> > >Loudspeakers are not birds,
> > >A listening room is not nature."
> > >Klas Strandberg
> > >Yahoo! Groups Links
> > >
> > >
> > >
> > >
> >
> > Telinga Microphones, Botarbo,
> > S-748 96 Tobo, Sweden.
> > Phone & fax int + 295 310 01
> > email:
> >
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