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Old 8th November 2013, 07:10 AM   #3771
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by Jmmlc View Post
At the time we have to write our own routines and one that was the most problematic was the "colouring in" routine
Hi Jean-Michel,

Many thanks for the historical background - it is nice to know that it was not just me who had difficulty "colouring in" :-).

(Your project was obviously a lot more complex than mine, though).

Kind regards,

David
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Old 8th November 2013, 08:56 AM   #3772
mwmkravchenko is offline mwmkravchenko  Canada
Mark Kravchenko
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Hornresp
They tongue in cheek reference to colouring in was made with a bit of understanding. Way back when I had hair, AND was programming we would have to address each pixel in the Z80 based computers I was working on. So yes I do have a foggy recollection of what kind of fun AND games this can be.

Besides, when else can I get away with teasing a man I admire and respect?

Much appreciated.
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Old 9th November 2013, 06:25 AM   #3773
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by mwmkravchenko View Post
They tongue in cheek reference to colouring in was made with a bit of understanding. Way back when I had hair, AND was programming we would have to address each pixel in the Z80 based computers I was working on. So yes I do have a foggy recollection of what kind of fun AND games this can be.

Besides, when else can I get away with teasing a man I admire and respect?

Much appreciated.
Hi Mark,

I know what you mean about addressing individual pixels - what a pain it can be!

The Impulse Spectrogram and Polar Map are good examples in Hornresp.

As far as "teasing" is concerned - go for it! It's nice to have a bit of humour around the place. Life can be very boring otherwise :-).

Kind regards,

David
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File Type: png Polar.png (83.9 KB, 195 views)
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Old 12th November 2013, 04:28 PM   #3774
AndrewT is offline AndrewT  Scotland
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I stuck to just green and very pale green (some called that white).
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Old 22nd November 2013, 06:22 PM   #3775
jwmbro is offline jwmbro  United States
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Hi, I searched this thread, and did find some mention of the term, but not sure what the current status is - I was playing around with the particle velocity tool, which is nice for checking for potential chuffing in a BR type enclosure, however for TL / TTQWT enclosures I can only view driver velocity and throat velocity. But since the narrow point for these enclosures is at the mouth, it would be nice to see mouth velocity too somehow. Any chance of this happening?
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Old 23rd November 2013, 06:22 AM   #3776
David McBean is offline David McBean  Australia
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Originally Posted by jwmbro View Post
But since the narrow point for these enclosures is at the mouth, it would be nice to see mouth velocity too somehow. Any chance of this happening?
Hi James,

I will add it to the list of "things to look at" :-). It may take a while though, as I am extremely busy at the moment.

Kind regards,

David
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Old 24th November 2013, 08:40 PM   #3777
jwmbro is offline jwmbro  United States
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Quote:
Originally Posted by David McBean View Post
I will add it to the list of "things to look at" :-). It may take a while though, as I am extremely busy at the moment.
Thanks, David! No rush of course, I'm grateful for whatever updates you manage to make in your free time.

I have another question however, I'm a bit confused by some of the numbers HornResp is giving me. I'm simulating a vented box, no real drivers, just doing some theoretical testing, here are the inputs:

Code:
ID=29.00
Ang=2.0 x Pi
Eg=45.00
Rg=0.00
Cir=0.00
S1=0.00
S2=0.00
L12=0.00
F12=0.00
S2=0.00
S3=0.00
L23=0.00
F23=0.00
S3=0.00
S4=0.00
L34=0.00
F34=0.00
S4=0.00
S5=0.00
L45=0.00
F45=0.00
Sd=1000.00
Bl=18.00
Cms=4.00E-04
Rms=4.00
Mmd=20.00
Le=1.00
Re=6.00
Nd=1
Vrc=200.00
Lrc=20.00
Ap=200.00
Lpt=42.00
Vtc=0.00
Atc=0.00
Pmax=100
Xmax=5.0
Comment=Vented Box Displacement test
and I'm looking at the Acoustical Output Power (double click on spl response graph and enter a frequency). For 16Hz (this is below the port tuning frequency) the driver output has about 105dB into 2pi, which HornResp tells me is 0.2 Watts - sounds about right to me.

However when I plot the combined output, level at 16Hz goes down to about 104dB (seems reasonable, since there is going to be cancellations below tuning frequency in a vented box) - but HornResp says the acoustical output power is now 0.95Watts (ie the sum of the output power of the driver & the port at that frequency) - but shouldn't this get less if SPL is getting less?
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Old 25th November 2013, 06:28 AM   #3778
David McBean is offline David McBean  Australia
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Hi James,

Quote:
Originally Posted by jwmbro View Post
Thanks, David! No rush of course, I'm grateful for whatever updates you manage to make in your free time.
The requested feature will be included in the next update - due for release in the next week or so.

Quote:
Originally Posted by jwmbro View Post
However when I plot the combined output, level at 16Hz goes down to about 104dB (seems reasonable, since there is going to be cancellations below tuning frequency in a vented box) - but HornResp says the acoustical output power is now 0.95Watts (ie the sum of the output power of the driver & the port at that frequency) - but shouldn't this get less if SPL is getting less?
I currently define the total acoustical power as the sum of the outputs from the two sources. If it makes more sense to show the resultant power after phase difference cancellations are taken into account, then that can certainly be provided instead. I would be interested in people's views on this matter.

Kind regards,

David
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Old 25th November 2013, 10:51 AM   #3779
David_Web is offline David_Web  Sweden
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Do both total and (net) within brackets. Should fit, not that a wider window would be bad if it does not.
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Old 25th November 2013, 11:05 AM   #3780
mwmkravchenko is offline mwmkravchenko  Canada
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