Precise, same moments/durations. And the writings point to both pitch
and amplitude changing happening very quickly consistent with the
warbler moments and insect bursts. It does seem logical that ATRAC
would be more challenged, but I've gotten it with uncompressed
MBHO->MP2->(line input) D7 Walkman DAT and with mkh/nt1a->744T (and
also with lesser saturated calls not exhibiting it, BTW). Could be
one of those demanding situations that presses even the best amp/A-D
combos are pressed beyond their limits. It could even start in the
mics too. Very useful. Thanks everyone. Rob D.
At 9:34 AM +0000 1/11/06, Raimund Specht wrote:
>Rob, you wrote:
>
>> I believe the distortion is embedded in the loud call of Rich's
>field
>> original. Perhaps saturating -only to ~-15 dB in the field for
>sounds
>> with lots of high Hz energy would be safer practice for now.
>
>I also believe that there is already some distortion present in the
>original recording (in the first part of the file). I guess that
>there actually happened simple clipping while recording (at least at
>t= 2.91s, 3.17s and 3.36s). The ATRAC bit allocation algorithm then
>probably smeared the original clipping patterns and increased the
>distortion (because the broad-band structure of the clipped signals
>pushed the MiniDisk ATRAC encoder to its limits):
>
>http://www.avisoft.com/scratch/0659.gif
>
>It is the unnatural spectral distribution at the loudest points that
>let me think that clipping and/or an ATRAC artifact is the reason
>for the distortion. In a natural bird song, the intensities of the
>harmonics usually decrease monotonously towards higher frequencies
>(the 1st harmonic is softer than the fundamental, the second
>harmonic is softer than first harmonic and so on). In this recording
>(at t=2.91s and 3.36s) however, the second harmonic at 16 kHz is
>stronger than the first harmonic at 11 kHz.
>
>However, the previously mentioned slew rate distortion would cause
>similar effects.
>
>Regards,
>Raimund
>
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