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Multi-Way Conventional loudspeakers with crossovers

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Old 7th March 2013, 05:58 PM   #21
ra7 is offline ra7  United States
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Used Gadwin PrintScreen:
Screen Capture and Print Screen software

When you install it, right click on the toolbar icon and choose to select area to copy through rectangular window, and choose to copy output to clipboard only. Then go to paint.
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Old 7th March 2013, 06:28 PM   #22
gedlee is offline gedlee  United States
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Quote:
Originally Posted by markus76 View Post
The technique is actually pretty old. I think Bauer was the first to describe it a couple of decades ago. Problem is that it doesn't work (for me, in my room).
As my app will show, it does not work for a lot of speakers. The image may not shift, but the frequency response goes all to jell.
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Old 7th March 2013, 06:30 PM   #23
gedlee is offline gedlee  United States
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Quote:
Originally Posted by ra7 View Post
Used Gadwin PrintScreen:
Screen Capture and Print Screen software

When you install it, right click on the toolbar icon and choose to select area to copy through rectangular window, and choose to copy output to clipboard only. Then go to paint.
Actually you can just do shift-prt sc and then copy to paint and window there.

OK - screen capture solved. Any ideas on how to use RGB to capture coloration from frequency response?
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Old 7th March 2013, 07:04 PM   #24
Elias is offline Elias  Finland
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Quote:
Originally Posted by gedlee View Post
The right speaker feeds the right ear only and the left speaker feeds the left ear only. There is no head diffraction model.

Without head diffraction you are modeling a headphone listening ! The image will be inside the head. How representative is this to speaker directivity evaluation.

If you include head diffraction there will be severe comb filtering and all the responses will look bad regardless of speaker directivity. Maybe you dont want that ?

To draw anything useful conclusions at the end you need to implement full auditory localisation model that include at least ITD, ILD, IETD and preferably pinna localisation too. Without it the results will be highly missleading.
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Old 7th March 2013, 07:05 PM   #25
Thunau is offline Thunau  United States
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Alt-Print Screen captures only the current Window in focus. Then you paste it into an image editor.
But the best kept secret in Windows is the Snipping Tool which is included in Windows. You can find it in Start>All Programs>Accessories . It lets you drag a window and capture any part of the screen and it will save the capture as png for a very sharp look with no jpg artifacts. Extremely easy and convenient.
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Old 7th March 2013, 07:23 PM   #26
gedlee is offline gedlee  United States
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Here is the same speaker but pointed straight ahead. The frequency response is straight ahead, but the area of decent imaging is much smaller.

A few feet off center and the image will collapse to the nearest speaker.
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Old 7th March 2013, 07:34 PM   #27
gedlee is offline gedlee  United States
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Here is the same room and listening position but a standard two-way speaker. Image is about the same as the Abbey pointed straight ahead.

Second pic is the same speaker toed in. Not much improvement in image, but some degradtion in frequency response.
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File Type: jpg shot4.jpg (158.6 KB, 508 views)
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Old 7th March 2013, 07:35 PM   #28
gedlee is offline gedlee  United States
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Quote:
Originally Posted by Elias View Post
Without it the results will be highly missleading.
Then why are you here? You said this before, it isn't any truer now.
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Old 7th March 2013, 07:53 PM   #29
gedlee is offline gedlee  United States
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I will admit that the entire validity of these plots (for image) is founded on the validity of Blauert's Fig 3.5. I assume that this figure accounts for head diffraction since the setup shown has crosstalk.

Blauert also says "These curves have not yet been sufficiently verified by measurement to be useful other than for qualitative study." Precisely what is being done here.
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Old 7th March 2013, 07:57 PM   #30
gedlee is offline gedlee  United States
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Blauerts fig 3.3 is also interesting because it shows that amplitude differences in R-L ear signals creates just about the same image shift independent of frequency, but for time changes the ear image is much much more sensitive at about 1 kHz.
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