On Sat, 17 Jan 2004 23:52:26 +0000
Kurt Hamster wrote:

I really don't care what you use. The bone of contention I have is your
lecturing me about how it should all be accurate then you feed it with
****e.

Could be worse... I could be feeding it from vinyl...


--
Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux

Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup.

On Tue, 13 Jan 2004 22:44:29 +0000, Ian Molton wrote:

On Tue, 13 Jan 2004 19:20:08 +0000
Glenn Booth wrote:

In 'real life' pink has a given wavelength and intensity.

True for pink (desaturated red), but it gets complicated with purple.
The texts refer to 'lines of purple' as it doesn't have a single
'frequency' and doesn't appear on a classic colour wheel, but you can
sure as heck see it. The same perceptual problem accounts for the
'bands' that appear in rainbows.

Im wondering if this is the same 'problem' as hearing a 50 Hz tone when
you play a 400 and 450 Hz tone ;-)

That doesn't happen in linear systems, and I thought that linearity
was your big thing? :-)
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On Sun, 18 Jan 2004 16:09:15 +0000 (UTC)
(Stewart Pinkerton) wrote:

Im wondering if this is the same 'problem' as hearing a 50 Hz tone when
you play a 400 and 450 Hz tone ;-)

That doesn't happen in linear systems, and I thought that linearity
was your big thing? :-)

Oh god not again.

You HEAER it. it doesnt actually exist.

--
Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux

Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup.

On Sat, 17 Jan 2004 11:51:36 +0000 (UTC),
(Stewart Pinkerton) wrote:


You can get at least 200 CDs onto a 120GB hard disk if you insist on
computer storage, and I don't know *anyone* who listens to more than
200 different discs in an average year.

RAOTFL ...

A quick estimate suggests that I probably listen to something like
2000 different discs in an average year.

Julian

--
Julian Fowler
julian (at) bellevue-barn (dot) org (dot) uk

In message , Kurt Hamster
writes
On Sun, 18 Jan 2004 16:19:08 +0000, Ian Molton used
to say...

On Sun, 18 Jan 2004 16:09:15 +0000 (UTC)
(Stewart Pinkerton) wrote:

Im wondering if this is the same 'problem' as hearing a 50 Hz tone when
you play a 400 and 450 Hz tone ;-)

That doesn't happen in linear systems, and I thought that linearity
was your big thing? :-)

Oh god not again.

You HEAER it. it doesnt actually exist.

Don't tell me you believe in ghosts too?



You only hear it if either your system is non-linear, and therefore
multiplicative mixing is taking place, or that you are listening at such
a high level that your ears are being driven into overload.
--
Chris Morriss

On Sun, 18 Jan 2004 18:06:56 +0000
Chris Morriss wrote:


You only hear it if either your system is non-linear, and therefore
multiplicative mixing is taking place, or that you are listening at such
a high level that your ears are being driven into overload.

Tell that to a set of piano strings...


--
Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux

Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup.

Ian Molton wrote:

Im wondering if this is the same 'problem' as hearing a 50 Hz tone
when you play a 400 and 450 Hz tone ;-)

That doesn't happen in linear systems, and I thought that linearity
was your big thing? :-)

Oh god not again.
You HEAER it. it doesnt actually exist.

I just used a tone generator to play a 400Hz and a 450Hz tone together, and
there was no 50Hz tone that I could hear. How's that?


--
Wally
www.artbywally.com

In message , Ian Molton
writes
On Sun, 18 Jan 2004 18:06:56 +0000
Chris Morriss wrote:


You only hear it if either your system is non-linear, and therefore
multiplicative mixing is taking place, or that you are listening at such
a high level that your ears are being driven into overload.

Tell that to a set of piano strings...



Simple addition of two frequencies does NOT result in any new
frequencies. Only non-linearities causing one of the signals to be
multiplied by the other (aka 'mixing', 'modulating' or 'heterodyning')
will cause sum and difference frequencies to be created.

I've no idea over what amplitude range the ears are linear, but if the
ear is presented with sounds that drive it into non-linearity then the
sum/difference frequencies will be heard I guess.

Anyone know how linear the sound detection mechanism of the ear is?
(Genuine question, 'cause I don't know)
--
Chris Morriss

On Sun, 18 Jan 2004 20:58:07 -0000, Wally wrote:

Ian Molton wrote:

Im wondering if this is the same 'problem' as hearing a 50 Hz tone
when you play a 400 and 450 Hz tone ;-)

That doesn't happen in linear systems, and I thought that linearity
was your big thing? :-)

Oh god not again.
You HEAER it. it doesnt actually exist.

I just used a tone generator to play a 400Hz and a 450Hz tone together,
and
there was no 50Hz tone that I could hear. How's that?

(I think) the idea is the brain trying to fill in the fundemental
frequency,
why when you hear a 50Hz bass guitar note on a tiny speaker cutting out
at 200Hz you can still 'see' roughly where the real note is.

I tried it and didn't hear anything like a deep bass note. Maybe if the
tones were 100Hz and 150Hz, unless we're talking about a different theory.

--
Jim H jh
@333
.org

On Sun, 18 Jan 2004 21:50:10 +0000, Chris Morriss
wrote:

Simple addition of two frequencies does NOT result in any new
frequencies. Only non-linearities causing one of the signals to be
multiplied by the other (aka 'mixing', 'modulating' or 'heterodyning')
will cause sum and difference frequencies to be created.

That poses the question, how can I tune instruments accurately using
beat frequencies?


--
Chris Isbell
Southampton
UK