[Ideas] Sound or app that keep dog away - Page 3 - maemo.org

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	casper27	2011-06-08 , 12:13
	Posts: 844 \| Thanked: 521 times \| Joined on Jan 2009 @ UK southampton	#21

Originally Posted by cvetkov.i

Nobody know the kHz of the sound we need?

Why are you soo suprised, this isnt exactly a widely known fact amounst us geeks.

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cvetkov.i	2011-06-08 , 12:18
Posts: 51 \| Thanked: 17 times \| Joined on May 2011 @ Bulgaria	#22

hah you are right

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cvetkov.i	2011-06-08 , 12:20
Posts: 51 \| Thanked: 17 times \| Joined on May 2011 @ Bulgaria	#23

Originally Posted by Duffer

According to a quick google scholar search http://www.freepatentsonline.com/y2009/0038664.html

Indicates at least 20KHz

Another search seems to suggest that the range of frequencies smartphone speakers can output is only 300 to 4k to be exact (EX Smartphone audio engineer)

Source http://acapella.harmony-central.com/...requency-range

Sorry doesn't look good?

ok but what kHz is the antimosquito sound ? I think that is something simillar beacause of the warning about dogs and cats when start the app.And n900 play it?

Last edited by cvetkov.i; 2011-06-08 at 12:23.

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gryedouge	2011-06-08 , 12:29
Posts: 249 \| Thanked: 167 times \| Joined on Mar 2010 @ International	#24

Originally Posted by cvetkov.i

it is not such a problem i`m not afraid from these street dogs.I kick them but if i have something like that may be they will remember me with this sound.

Why not get yourself some pepper spray or make your own and use this?

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	Duffer	2011-06-08 , 12:37
	Posts: 223 \| Thanked: 52 times \| Joined on Sep 2009 @ West Kirby, UK	#25

Well lets just say it's 4KHz Max. Scaring a cat is one thing, you can cause a sensitive cat distress quite easily, hence the warning.

Deterring and angry/aggressive dog is a different matter, you would have to cause it discomfort, the dB level would have to be quite high. Probably more than the N900 can produce?

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	dr_frost_dk	2011-06-08 , 12:44
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#26

Originally Posted by Duffer

Well lets just say it's 4KHz Max. Scaring a cat is one thing, you can cause a sensitive cat distress quite easily, hence the warning.

Deterring and angry/aggressive dog is a different matter, you would have to cause it discomfort, the dB level would have to be quite high. Probably more than the N900 can produce?

Well im pretty sure our N900 can produce beyond 4Khz as you stated it was for smart-phones in general, looking at the speakers i know that they can go way beyond that, an take it from someone that been building HiFi for over 10 years, and have also made a very small speaker set made by the very speakers that's in our N900/N95

But yes on the dB level, that's why i would say a dog whistle is a better choice, it hits the high note (that we can't hear) and like a normal whistle it does generate some dB

EDIT: Not saying that this is impossible tho

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	nicolai	2011-06-09 , 07:55
	Posts: 1,637 \| Thanked: 4,424 times \| Joined on Apr 2009 @ Germany	#27

I don't know if this helps:

Code:

gst-launch-0.10 audiotestsrc freq=440 ! audioconvert ! pulsesink

(needs gstreamer0.10-tools)

You can change the frequency parameter from 0 to 20000.

(Don't forget, you won't hear any sound while the silent profile
is active)

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	nicolai	2011-06-09 , 08:03
	Posts: 1,637 \| Thanked: 4,424 times \| Joined on Apr 2009 @ Germany	#28

And a more advanced version:
(needs gstreamer0.10-plugins-good-extra
and python-gst0.10)

Attached Images

Attached Files

soundgen.py.gz (1.3 KB, 115 views)

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	JohnLF	2011-06-09 , 08:09
	Posts: 551 \| Thanked: 507 times \| Joined on Feb 2010 @ North West England	#29

You'd be much better off with a dedicated unit, quicker and easier to operate.
Something like this.

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	dr_frost_dk	2011-06-09 , 09:07
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#30

Originally Posted by JohnLF

You'd be much better off with a dedicated unit, quicker and easier to operate.
Something like this.

Like i said ultrasound baby

Our N900 can do about anything, but for some purposes i prefer direct "tools", like flash light, the N900 has a good flash light function but compared to my DIY 50W Led flash light there is no question what i use, N900 will light up a path in front of me, my 50W lights the hole neighbourhood, and i really mean the hole neighbourhood.

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