Re: OT: Mp3 quality Final


"RCE" <rce@xxxxxxxxxxx> wrote in message
news:YMidncC0hod-y4XZRVn-rg@xxxxxxxxxxxxxxx

I promise that this will be the last of my posts on this subject, as I
realize it's OT and probably boring as heck to many. However,

Many of us enjoy the pursuit of experimenting and building sound
reproduction systems and some of us take it to extremes. But, for most,
it's just an interest - a hobby - much like playing golf or flying
airplanes or boating.

One thing I've discovered though. More people have the capability to
discern and appreciate a quality sounding audio system than will admit or
realize. Most people I've met that claim to be "tone deaf" or can't hear
the difference between a basic music system and a higher quality system
will sit up and take notice the first time they hear a favorite piece of
music played on a really good system. The dropped jaws and "WOW"
underscores the fact that they *can* hear the difference. It may not mean
or be important enough to cause them to invest in new audio gear, but my
point is that more people can appreciate it than they give themselves
credit for.

Now back to your regular programing.

RCE


The problems you see with MP3 are not the 44khz sampling rate. the rate is
high enough to prevent aliasing (the wheels turning backwards on a wagon in
a movie is aliasing). The problem is how the compression is done. MP3 has
a lossy and a lossless compression. The Lossless, compresses like PKZIP,
you have all the info still available. If there are repeated series of
bits, then that is replaced with a number and length. The "lossy"
compression is where people with good hearing notice the difference. The
MP3 algorithm assumes that you will hear only the loudest of 2 sounds at the
same time, so ignores the lower level sound. Unfortunately that lower sound
will beat with the louder sound to generate some harmonics that you will
miss. I also think they also get rid of frequencies outside the normal
hearing range, which affects those with extended hearing ranges as well as
remove the generated harmonics.


.

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