On 09/24/2012 10:58 AM, Dave Malham wrote:
On 23/09/2012 11:19, Fons Adriaensen wrote:
On Sun, Sep 23, 2012 at 09:31:30AM +0100, Augustine Leudar wrote:
except its not quite the same effect. If I hear a plan(ish) wave in
nature
such as in thunder or a very distant giant waterfall
I doubt ver
Interesting point. I guess it has to do with statistics - but I don't know.
Dave
On 24 September 2012 18:49, Jörn Nettingsmeier
wrote:
> On 09/24/2012 10:58 AM, Dave Malham wrote:
>>
>>
>> On 23/09/2012 11:19, Fons Adriaensen wrote:
>>>
>>> On Sun, Sep 23, 2012 at 09:31:30AM +0100, Augustin
...let us describe the main relations again.
The surface of the wave front radiate from point source increase by pi*d
quadrat. For double distance 4times larger surface results. 10 log (1/4) =
- 6,02 dB.
Cylinder wave surface doubled by double distance. 10 log( 1/2)= -3 dB.
Plane wave surface rem
On Mon, Sep 24, 2012 at 07:49:42PM +0200, Jörn Nettingsmeier wrote:
> on the other hand, i know that roads and highways are treated as
> line sources as well for the purpose of emission control, i.e. with
> 3dB attenuation per doubling of distance.
>
> maybe someone can explain why this should be
On Mon, Sep 24, 2012 at 09:15:24PM +, Fons Adriaensen wrote:
> which is 2 * pi / d, i.e. proportional to 1 / d, hence -3dB for
Oops, pi / d of course.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and
On 2012-09-24, Fons Adriaensen wrote:
For a line of uncorrelated sources we have to add powers. Imagine the
line source as the x-axis, with the origin being the point nearest to
you. Let your distance be 'd'. Then the distance to a point 'x' on the
line is sqrt(d^2 + x^d). The total power at d
