AW: [sdiy] some observations : audibility of phase distortion

[Czech Martin]

Just a simple thought:

we know from transmission line theory that 
only loss less (short) lines show no dispersion.
Dispersion means that different frequencies travel
with different speed.

This is only one dimensional, but this does not matter.

This is a fundamental property of the physical laws
that can be expressed as wave differential equations.

So, if you are close to a sound source, this can be pretty loss less.
So dispersion will not be dominant. 
At some kilometers distance, it will.

The higher the frequencies, the higher the losses.

m.c.

> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of TIm Daugard
> Sent: Freitag, 9. Januar 2004 22:05
> To: Synth-Diy
> Subject: Re: AW: [sdiy] some observations : audibility of phase
> distortion
> 
> 
> My understanding from lots of physics books is that the speed 
> of sound is the
> same for all frequencies. It varies with material or air i.e. 
> speed through
> metal is faster than speed through air. It varies with air 
> temp and pressure.
> 
> The explanation in a music and physics book points out that 
> if the speed varied
> with frequency, a symphony orchestra playing tightly in sync 
> would sound lousy
> 100 feet away.
> 
> Tim Daugard
> 
> 
>