my 2 bit
sound are waves, so can be measured in hertz, kilohertz etc...
audible sound (what we human can hear) are in 1 range and ultrasonic (beyond human hearing) are in a different range
but both are sound and in IT-speak, both are audio files, as such I would assume they will be encoded the same format and thus bear the same extensions ie mp3, wav or whatever that applications and embedded systems can read and reproduce.

As tuckfook as pointed out, it all depends on wheter
1)ultrasonic sound was indeed recorded thru ultrasonic-capable mikes
2)your amp and tweeters are ultrasonic-capable to play and output the ultrasonic sound
I hope this helps.

Elaboration of my question in response to tuckfook's clarification
Say swiftlets songs consist of the 3 syallables
WAH TOLONG LU, LU TOLONG WAH, najis

WAH TOLONG LU, LU TOLONG WAH is in the audible range (ie we humans can hear and so can the swiftlets)
najis is in the ultrasonic range ie (we humans CANT hear but swiftlets can)

My question to tuckfook was, is there a possibility that past testing failed cos'
As the amp was set to output only the ultrasonic.....the tweeters played only..
najis, najis, najis....so the swiftlets did react a little but not as much as they would if the full range of the 3 syllables were played?

What if?????
WAH TOLONG LU, LU TOLONG WAH, najis are ALL manipulated into the ultrasonic range?????
Questions
1)Since all 3 are manipulated correspondingly to mantain the rhythm can any of the 3 syllables get BEYOND the swiftlets hearing?
2)Will the swiftlets still recognise WAH TOLONG LU, LU TOLONG WAH in ultrasonic for what it means in the audible range?

to work out
1)How to manipulate a proven pooling sound into the ultrasonic range?
Can one of the freeware audio app do it?

Yes you are correct that part of the birdsong is reproduced, if the song has no "ultrasonic" birdsong, then none is recorded and therefore none is re produced.

Ultrasonic here is beyond 'most' human audible range. Dogs, and young humans, can still hear that range. Not in the more technical sense as beyond complete human auditory range defined at 40khz and above.

We cannot convert normal audible to ultrasonic as then we would distort the original content. We can only play back the ultrasonic range if it exists.

Regenerating the birdsong completely into an ultrasonic range would seem ridiculous to me, akin to Sinatra singing in extremely tight pants straddling a bouncing narrow bar. Maybe the birds would find that interesting and amorous.

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Added on May 24, 2010, 4:01 pmSound is basically in cycles per second.

If we compress it into half, ie the same number of cycles but in half the time or 2x the cycles per second, we actually double the frequency.

So, we can compress the music into one quarter and achieve very high frequencies but it'll sound silly, like donald duck having b..ls squeezed.

Most audio editing software will have a function to do this. You can keep compressing until it is totally inaudible to humans.

What I had done was to remove the audible to humans section and played the barely audible to humans remainder to the birds.




This post has been edited by tuckfook: May 24 2010, 04:01 PM

tuckfook,
Again thks.
It's clear now that it's a dead end.

Well Well, look at this site. Penang's latest Heritage Boutique Hotel !

THIS HOTEL ACKNOWLEDGES THAT SWIFTLETS ARE PART OF IT'S HERITAGE

http://yengkenghotel.com.my/index.html

Thank you and well done.

This post has been edited by tuckfook: May 24 2010, 09:54 PM

Link to this forum, my friend :
swiftlet farming business

This post has been edited by Engineer Lee: May 24 2010, 11:40 PM

haha..... i think these "babies" are the one should guide us instead we guide them..now is terbalik..we are the one trying so hard to guide them and lead them for the correct way.

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Added on May 25, 2010, 8:29 amBTW, i also have watched the movie "The God Must be Crazy"..

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Added on May 25, 2010, 8:38 amAgreed. Just like in the movie "300"

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Added on May 25, 2010, 8:43 am true classic

This post has been edited by Ivan Ho: May 25 2010, 08:43 AM

' my guess is playing a normal .mp3 track in ultrasonic amp.'

I guess many will not understand your simple statement.


Therefore any chance of any bird recordings being made higher than 22khz will have to be Analog all the way or SACD or equivalent hi fq recording.

does all this means playing our normal mp3 sound on those ultrasonic amp. will not work?

I guess put in simpler words, we human like walet can hear below 20kHz. If you record your own voice in 5kHz range, and try to modify it into 15kHz and listen, probably you cant even recognise your own voice.

Same principle apply to this ultrasonic I suppose. If you wanna play ultrasonic sound of walet, you have to record original ultrasonic sound and play back, if tat possible. You cannot simply use normal <15kHz sound, modify to >40kHz and play with ultrasonic player. The bird like you cannot recognise even own voice in these range, even if it can hear the voice, the sound will be distorted. But according to research, audible sound for walet is <15kHz. Anything above is as good as useless. Pls correct if understanding not right. Thks.


Anyone knows any good place in KT for BHs viewing? Jalan-jalan makan angin at the island this wkend.

Correct, it will not work for your intended purpose.

the only ultrasonic sound i know is

**deleted**

This post has been edited by htc: May 25 2010, 05:41 PM

Aiyo yo.... htc, you post this kind of link ar ? This is the most feared "weapon of mass destruction" if it fall into "wrong hands".

That was really swift

swift like them swiftlets

Im so lucky. Very lucky . I will not feel sad if one day the authorities starts taking down or removing the bird house owners . Sorry to say this but if you watch Jack Neo movie the latest one, the saint who try to persuade the person that doing evil is bad had turn into deaf ear, in the end the saint also join the evil to persuade jack neo to climb the wall so that he could die faster.

The reason im saying this is because i realize that only a few forumers here have their radar switch on 24 hours on the swiftlet news on the govt ruling. The rest are just worst than DOGS... Remember the scene in one of the Bruce Lee film... No Dog , No Chinese?
This is what happen when the signage was even put up bravely by the Japanese to insult us and no one do anything about it...

Same goes to these people who cares about the methodology but neglect the discussion on the rulings and the secret movement with agendas . That's y i can said so loud because i don't own any bird house as yet but probably not going to happen either looking at the scenario here , there is no unity or union to even inform or do something. Everybody taking care of themselves. Selfishly .

those who are the quiete one, better take baby steps to do something and voice out your opinion against anything you think is not fair. Don't let other people to talk for you . I know person like Cergau still hoping to see the light of the industry but haven't get enough of people or speakers to start the movement and making more sound to the authorities . Those of you already have and in the business think others will help you do your work again, think deeply . The papers have came out all the stories that is more negative than positive to all of you out there and you are still sleeping like a big Fat Giant . Good luck to all the lazy mother arkers.

This post has been edited by hackwire: May 25 2010, 09:48 PM

Tats life here in this Tidak-Apapa-Land my fren, unless you were born yesterday, dont know the people in the country. No point to shout lah bro.

Take a few eg which has nothing to do with swiftlet but causing major concern with the gomen procedures, integrity and responsibility to the citizens:-

1. Teo Beng Hock case. How many people here or in LY forum or in Klang valley actually came out from their cozy homes and tell the gomen, this is wrong, procedures is wrong, how can witness threated like criminals, for Rm2000 why need to interview overnight, how can witness released without his personally belongings, without signing off etc. I see more MU fans when MU in town than Kelana stadium or Chinese Assembly Hall. Shame to all rakayt.

2. Police shooting and killing of young boy in Shah Alam recently who was unarmed. Why bullet to the head, what the boy did? Who cares? Nobody did, life just gone. No one responsible.

3. Lingam correct correct ..........................................

No point to shout and claim hero cause majority prefer to care own eggs mah.

When fire starts burning eggs, then we will will come out from the nest and shout .. hooahhh we want to fight

Ok, lets get back to swiftlet, we have diverted.

This post has been edited by Bobby C: May 26 2010, 02:43 PM

hai ya, if don't shout than all the same loh. If Bruce Lee don't embarass the Chinese through his movie showing that Dog entering the premises even though the signage shows the sign No Dog than that means We accepted the fact that we are worse than Dog.

And how many people hate Bruce Lee after showing this movie? None right, y? because we knew we are portrayed correctly as worse than dog and we found a saviour to wake us up. So Bruce Lee is forgiven . Try to do this kind of scene today by someone not famous... what's the repercussion as compare to the 70s . People behind those days are more receptive than today.

So do you want your son to ask this...
" Papa , am i a Dog ".

This post has been edited by hackwire: May 26 2010, 03:09 PM

This posting is very rude, disgusting and annoying. It is absolutely unnecessary to hurl unsolicited derogatory remarks and throwing absurd tantrums against other forumers even if they are not interested to participate in any discussion. Weirdly, this poster was not even being specifically provoked or irked by any one here. Maybe this sudden outburst is a symptom of movie overdosed if not manic depression.

Sadly, thts true...

this forum is mainly read faithfully by few groups of ppls, to name a few :

1) ppls with failed/slowed farms that looking for solutions to revive their farms.
2) ppls that want to get into the industry and trying to find as much info as possible.
3) officers that are trying to look for lubang to find ways to corrupt n earn sinful money.
4) anti farms ppls that trying to pick on bone for reasons to get rid of us.

and the least...ppls that try to use this forum to spread info whether good or bad that will affect the industry.

so asking all these 1 to 4 groups of ppls to fight this war is hopeless (in fact it will affect them whether they are shop farms or standalone farm owners).



but salute u, hackwire, u not even a farmer yet u are voicing for the thousands of farmers that will be affected by the new ruling.


as for whether they will let their childrens to name as dog, maybe they will compromise so that they only allowed others to name them dog during certain times or days?

Compromise is the key, right?



This post has been edited by ChanK: May 26 2010, 07:41 PM