linuxaudio.org

On 10/11/2011 11:36 PM, Fons Adriaensen wrote:
> There are at least two good reasons why such a test is

quoted text
> not valid.

>

> 1. The difference signal doesn't tell you anything about

> audible differences between two signals. It's fairly easy

> to make a linear filter (no compression involved) with

> a perfectly flat response and that nobody would be able

> to hear. But when you take the difference between in and

> out it is 3 dB higher than both.

>

> 2. Lossy compression is based on combined temporal and

> spectral masking - some signals you can't hear in the

> presence of others. Of course when you take away the

> masking signal they become apparent...

Makes a lot of sense, thanks!
BTW: Apparently the guy in the link has lifted the idea from this clip:
http://www.youtube.com/watch?v=wzJbjHc6bRE
where George Massenburg does the same. I don't know George Massenburg,

but he supposedly is some kine of authority in the world of audio

engineering. Not that it makes the test more valid...
--

Atte
http://atte.dk   http://modlys.dk

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