From: Stainless Steel Rat <[EMAIL PROTECTED]>
To: MD-L <[EMAIL PROTECTED]>
Sent: Tuesday, March 07, 2000 2:33 AM
Subject: Re: MD: Sony's new Internet Audio Recording Interface
>
> * Eric Woudenberg <[EMAIL PROTECTED]> on Mon, 06 Mar 2000
> | On what do you base this statement? My understanding of ATRAC (based
> | upon looking at an ATRAC decoder) is that the computational demands of
> | encoding ATRAC are similar to those for MP3. I would expect a software
> | ATRAC encoder to run about as fast as an MP3 encoder.
>
> If that were the case, then you would be able to encode MP3 streams that
> sound as good as ATRAC 4 (which they do not) in real time on your desktop
> (which you cannot at this time).
If you use a good encoder and the *same* bitrate as ATRAC you get damn
close!
> As I mentioned previously, a Pentium II
> running at 400MHz is capable of turning SPDIF into 128Kbps MP3 in real
> time, if it is not doing anything else.
A fair comparison would be to encode at the same bitrate as ATRAC. 128kbps
is substantially less than ATRAC resulting in a heavier computatoinal
requirement as more optimisations need to be made.
> The particular machine in question
> is a 64Mb system with fast/wide SCSI (so, no bottleneck there), using
LAME.
> 128Kbps MP3s do not sound nearly as good as ATRAC 4, so I have to say that
> the computational loads are not comparable.
You have to compare like for like. You are not doing so. Your logic says
that MP3 can't be comparable to ATRAC because if you compress audio to MP3
at half the bitrate of ATRAC it doesn't sound as good.... OF COURSE IT
DOESN'T!!! But then I wouldn't expect MP3 at 128kbps to sound as good as MP3
at 256kbps either, so your logic would say even if I use the same encoder
for both files they are not comparable.
Did you remember to engage brain before making that comparison, or was it
heat of the moment.... ?
Magic
--
"Creativity is more a birthright than an acquisition, and the power of sound
is wisdom and understanding applied to the power of vibration."
Location : Portsmouth, England, UK
Homepage : http://www.mattnet.freeserve.co.uk
EMail : [EMAIL PROTECTED]
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