[vorbis-dev] DWIT

[Andr Piotrowski]

am 14.01.2001 12:49 Uhr schrieb Steve Underwood unter steveu at coppice.org:

> Segher Boessenkool wrote:
> 
>> [good piece snipped]
>> 
>>> The list is quite long.
>> 
>> You forgot the biggie :-)
>> We can't hear phase differences above 2kHz.
> 
> Actually I think we both forgot the biggie - "well".  We can't  detect bass
> direction well. We can't detect mid to high range phase well. In fact, we
> aren't totally unable to detect most of these things, and when our ears latch
> on
> to the defects they tend to focus on them - at least mine do.
> 
> The phase thing is kind of interesting. If you have ever worked with a source
> of
> complex data, like radars and some sonars do, you will know the
> aliasing band is the same as the sampling rate, instead of half it. The whole
> world of signalling processing looks interestingly different, and seems quite
> alien to those who have never tried it. Fun stuff.
> 
>>> Current compressors exploit a number of limitations, but none is yet clever
>>> enough to exploit them all. That leaves lots of room for fun research!
>> 
>> The current codecs don't exploit the things they do to full
>> extent, either.
>> 
>> A nice paper to read:
>> 
>> "Ein psychophysiologisches Gehoermodell zur Nachbildung von
>> Wahrnehmungsschwellen fuer die Audiocodierung"
>> 
>> It's the dissertation of Frank Baumgarte.
> 
> Can you point to an English or Chinese translation of that? I'm Germanically
> challenged.
> 
> Regards,
> Steve
> 
> 
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Hi Steve, have a look at
www.tnt.uni-hannover.de/project/coding/audio/perception/publications.html
for some of Frank Baumgartes documents published in English language.

Regards,
André

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