what does mp3 encoding remove?

Hi folks. Just for fun, I encoded a snippet of Bach in a high bitrate
mp3 format, converted back to wav, inverted it and mixed it with the
original wav file, then amplified the result (the difference file
was at a very low volume, in other words, high bitrate mp3 does a
darn good job of lossless compression) and converted it back to mp3.
The result is "what mp3 encoding removes". I have placed the original
mp3 file and the difference file in my folder. I will remove them
shortly as they take up about 1.5 megs.

John Starrett

> Hi folks. Just for fun, I encoded a snippet of Bach in a high
> bitrate mp3 format

May I ask how high, which encoder, and the sample rate of the
original wav?

> converted back to wav, inverted it and mixed it with the
> original wav file, then amplified the result (the difference
> file was at a very low volume, in other words, high bitrate
> mp3 does a darn good job of lossless compression) and converted
> it back to mp3.

Good idea! Care to try the same sample with standard 128Kbps
mp3?

-Carl

--- In tuning@y..., carl@l... wrote:
> > Hi folks. Just for fun, I encoded a snippet of Bach in a high
> > bitrate mp3 format
>
> May I ask how high, which encoder, and the sample rate of the
> original wav?

Cool Edit 2000 variable rate centered around 190kps, wav file was CD
quality.

>
> > converted back to wav, inverted it and mixed it with the
> > original wav file, then amplified the result (the difference
> > file was at a very low volume, in other words, high bitrate
> > mp3 does a darn good job of lossless compression) and converted
> > it back to mp3.
>
> Good idea! Care to try the same sample with standard 128Kbps
> mp3?
>
> -Carl

I will try to give it a shot.

John Starrett