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Re: A problem about the relationship between perceived quality and loudness! thanks

Perhaps not exactly what you asked about, but many years 
ago (1970s?) there was a study where subjects were asked to 
adjust the volume of various audio systems until they were 
"loud".  The surprising result was that high-powered 
systems were turned up to much higher output levels than 
low-powered systems before they were "loud".  The 
explanation given was that subjects apparently correlated 
increased distortion (more than actual SPL) with "loud". 

Since amp distortion shoots up as the amp begins to clip at 
its maximum output level, the low-powered amps of course 
began to distort while producing lower SPL than the high-
powered amps.

Best regards,

Bob Masta

On 3 Jul 2008 at 18:20, Junyong You wrote:

> Hi All,
> As we know, loudness is an important audio index for human perception. Is 
> there anyone studied the relationship between quality distortion and the 
> loudness? I mean, if the same objective distortion happened on the different 
> audios (or segments) with different loudness, then, is there some difference 
> between the perceived qualities of these two audios (or segments)?
> I guess the loudness should influence the perceived quality of same 
> distortion, and for the very low and very high loudness, such influence 
> maybe not very great, but with ordinary loudness, perhaps the perceived 
> distortion will increase following the loudness.
> This is just my guess, anybody can help to work for it with me? Or could you 
> please give me some advice and references?
> Thank you very much, any feedback will be greatly appreciated.
> Best Regards,
> Junyong 

Bob Masta
            D A Q A R T A
Data AcQuisition And Real-Time Analysis
Scope, Spectrum, Spectrogram, Signal Generator
    Science with your sound card!