AW: adsr and lfo abolish (Don goes off the deep end again)

[Toni Jovanoski]

Hello Geren,

Tuesday, April 13, 1999, 7:54:29 PM, you wrote:

GWMJ> All that said, what explains our ability to tell not just left-right, but
GWMJ> up, down, fore and aft positioning of sounds?

It's simple , like tracking the sound.When you here a sound you always
move your  head to track the position of sound.Example, if sounds
comes from back , yours ears ( or brain ) will not spot the phase
difference.Then brain slightly  moves your head ( you always move your
head) and there will be
phase difference.Now brain knows from where sound comes!To track the
position of sound  the brain must know two phase differences at two
positions of head.The brain now 'knows' ( with this method ) the positions
of sounds in three dimensions. I hope you
understand it.Sorry for the bad english!

>>>Yes, all true, but it does not explain how we can hear phase
>>>differences between the ears so well,
>>
>> It does ! The brain is able to calculate differences in time of two
>> equal frequency distributions, but only if they change in time. (The
>> time resolution is 3*10E-5 seconds). If you START a sound left from your
>> head, the left ear will produce nerve signals milliseconds before the
>> right ear.
>> You can test it out : generate a constant sine tone with one of your
>> synths
>> and seperate the original signal and one phase shifted signal for your
>> left
>> and right ear. You will hear a sine tone in the centre of your head !
>> But : (perhaps you try this one with the computer) The original sine
>> tone
>> amplitude modulated with a square wave for example, and with a little
>> phase
>> shift of the right-ear-signal will sound like if the signal comes from
>> your left (Not only the phase of the sine is shifted, but also attack
>> and
>> instanteneous release of the signal !!)
>> (Sorry, i don't want to sound like a teacher)
>>
>>

GWMJ> Geren W Mortensen, Jr.

GWMJ> --
GWMJ> Blah, bLah, blAh, blaH, BLAH!


TJ