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[TowerTalk] Re: [AMPS] True Or Not True #2

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Subject: [TowerTalk] Re: [AMPS] True Or Not True #2
From: (Barry Kirkwood)
Date: Fri, 7 Sep 2001 10:45:59 +1200
Psychophysics (roughly defined as the scientific study of the relationship
between human and animal perception and physical energies)is a scientific
discipline dating back to the 1830s.
When you read  an eye chart or have your ears tested by an audiologist you
are doing psychophysics.
The issue under discussion is actually on applications of Weber's Law which
has it that humans perceive changes in energy in relation to the ratio of
energies rather than their absolute differences as measured in physical
units. Hence dB

Barry Kirkwood PhD ZL1DD
Signal Hill Homestay
66 Cory Road
Palm Beach
Waiheke Island 1240
----- Original Message -----
From: Stu Greene <>
To: Barry Kirkwood <>; <>
Sent: Friday, 07 September, 2001 9:49 AM
Subject: Re: [TowerTalk] Re: [AMPS] True Or Not True #2

> At 08:24 AM 9/7/01 +1200, you wrote:
> >By definition, from psychophysics, 1dB is the increase or decrease in
> >strength that can be discerned by an average observer on 50% of
> >A 2dB increase should be discernible by an average observer at any signal
> >level.
> >cheers
> what (is) (are)  psychophysics ?  Psycho I dig.  Physics, sure, Is the
> definition a weird science?
>   73  Stu

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