Hi Raimund,
I am not sure if it is all ATRAC, I do think the SoundBlaster Live I
have isn't that great a soundcard. Because when I am transferring
from my MD deck to my SPDIF input, I have to put the inputlevel to 59
%
In other words, the data is changed in real time ; the volume level
is reduced with 41 %
Not a bit-to-bit transfer... Stupid Soundblaster Live :(
A question from me, can you indicate roughly at which frequencys the
ATRAC is 'lost' in following the original? Are we talking above 15
kHz for instance (i.e. not audible by my ears) or are we talking
above 10 kHz or something like that?
Regards, Evert
--- In "Raimund Specht"
<> wrote:
> Evert just conducted another test (many thanks to him for doing
> that). This time he used the original full-bandwidth test file at a
> sample rate of 44.1 kHz (no resampling at all), recorded it
> digitally onto his KENNWOOD DM3020 MD recorder (that device has a
> fixed sample rate of 44.1 kHz) and played it back via SPDIF. The
> spectrogram created from this sound file still shows some dramatic
> artifacts:
>
> http://www.avisoft.de/compression/compressed441MD.gif
>
> So I guess, that this is the normal behavior of ATRAC 4.5.
>
> The low-pass filtered test file which were recorded and played back
> in the same way as the above example is still acceptable:
>
> http://www.avisoft.de/compression/compression.htm.
>
> If I interpret these results correctly (and if no other faults were
> involved), then ATRAC 4.5 (like MP3) would do a good job as long as
> no major high-frequency energy is present in a recording. In more
> extreme situations as the more demanding full-bandwidth test
signal,
> ATRAC 4.5 will reach its limitations and will clearly lose against
> MP3.
>
> Regards,
> Raimund
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