re: Bird calls in MP3 format?

Subject: re: Bird calls in MP3 format?
From: Paul Taylor <>
Date: Thu, 26 Oct 2000 14:14:43 +1100
Paul Foxworthy wrote:
> At 11:11 26/10/2000 +1100, John Boyce wrote:
> >recall.  Using an mp3 player (such as a compaq ipaq handheld pda) you
> >could already have 10 sec or so for each bird and the sound would be
> >retreivable in a few seconds.  Only available RAM is holding us back.
> There are MP3 players with 64 Mbyte of RAM available now, and if that's not
> enough, others have multi-gigabyte matchbox-sized hard disk drives.

There are also portable CD players that will also play MP3 files
stored on CD-R (and possibly CD-RW) disks.

One thing that should be pointed out is that MP3 is a lossy
compression format i.e. if you decode an MP3-encoded audio file,
the resulting audio will *not* the same as the original.
(The JPEG image format also uses lossy compression.)

How well MP3 works in practice depends upon the how accurate the
psychoacoustic model is, which is partially dependent on how much
accuracy you are prepared to sacrifice for better compression.
(The psychoacoustic model determines which parts of the original
audio cannot be "heard", and can be discarded to obtain greater
compression.)  I suspect that birdcalls may show more artifacts
as a result of compression than music, because it tends to
contain more information at higher frequencies(?)  If I find
some spare time, I may try converting some samples of birdcalls
from CD to MP3, and see if I can hear any difference.  (I've also
located some tools to visually show the differences in the signals
before and after compression, and analyze the distortion etc.)

   Paul Taylor                           Veni, vidi, tici -
                    I came, I saw, I ticked.

Birding-Aus is on the Web at
To unsubscribe from this mailing list, send the message
"unsubscribe birding-aus" (no quotes, no Subject line)

<Prev in Thread] Current Thread [Next in Thread>

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the birding-aus mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU