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Audible bats
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Silver Sparrow



Joined: 13 Aug 2005
Posts: 489
Location: The part of London with the smallest number of birds

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PostPosted: Tue Jul 11, 2006 6:21 pm    Post subject: Audible bats Reply with quote

Am i missing something here? We used to have bats about 6 or 7 years ago (back in my GCSE days wo00o0h0000) they lived in the church i think. anyway, we could hear their sonar thingies very clearly, they'd even come quite close and nearly swoop over our heads sometimes!

now all the articles on bats say u need that special equipment to modify the bats sonar thing to make it audible to human ears, but our bats were very much audible without any equipment at all. whats going on?

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Martin



Joined: 03 Nov 2005
Posts: 843
Location: Stevenage, Herts

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PostPosted: Tue Jul 11, 2006 6:47 pm    Post subject: Reply with quote

age

as you get older you lose more of your high frequencies

I think a device was demonstrated as an effective method of dispersing unwanted youths by emitting high frequencies that only humans below a certain age could hear !

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Tricia



Joined: 08 Apr 2005
Posts: 3579
Location: Surrey

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PostPosted: Tue Jul 11, 2006 10:31 pm    Post subject: Reply with quote

Martin wrote:
age

as you get older you lose more of your high frequencies

I think a device was demonstrated as an effective method of dispersing unwanted youths by emitting high frequencies that only humans below a certain age could hear !


You're right about age Martin. I once heard that a human's hearing reaches it's peak at age 9. Can't quite remember where I heard this, or whether it's fact or not!

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Last edited by Tricia on Wed Jul 12, 2006 10:22 pm; edited 1 time in total
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Silver Sparrow



Joined: 13 Aug 2005
Posts: 489
Location: The part of London with the smallest number of birds

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PostPosted: Wed Jul 12, 2006 2:49 pm    Post subject: Reply with quote

but even my parents could hear it and they were in their late 40s! are we just abnormal... and could this be the reason we could ALL hear the cat repellent (my mum is now in her 50s and she heard it too)

Quote:
I think a device was demonstrated as an effective method of dispersing unwanted youths by emitting high frequencies that only humans below a certain age could hear !
yes i know about this. Also, now teenagers are getting their own back and using these high frequencies as ring tones so they can use their phones in class without the teacher knowing!
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Hampshire Hogg



Joined: 28 Nov 2005
Posts: 119

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PostPosted: Wed Jul 12, 2006 4:05 pm    Post subject: Reply with quote

Another myth is dog whistles.

Where we walk the dogs a lady we know always calls her dogs with a special dog whistle.

The dogs appear to ignore it, but it takes the top of my head off every time she uses it.
I'm 74 ! and my hearing is not what it was, so it's effectiveness is suspect.

I once read an artical by a top wildlife expert who visited the Amazon to make a written record of moths.
He sat outside his tent with his yellow labrador who, as soon as night fell went berserk and refused to leave the tent.
It took him some while to realise that it was the sound from bats which was driving the dog mad.
To a dog it must sound like an express train coming straight at them.
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Silver Sparrow



Joined: 13 Aug 2005
Posts: 489
Location: The part of London with the smallest number of birds

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PostPosted: Mon Jul 17, 2006 6:50 pm    Post subject: Reply with quote

Does anyone know of any recordings of bat calls available for download - at the original frequency? i want to do a little experiment
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Nobby



Joined: 24 Mar 2005
Posts: 327
Location: Kenley Surrey UK

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PostPosted: Tue Jul 18, 2006 6:13 pm    Post subject: Reply with quote

Silver Sparrow wrote:
Does anyone know of any recordings of bat calls available for download - at the original frequency? i want to do a little experiment

If you want to play it back you may need a very good speaker as most work at audible frequencies.
Brett.
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Silver Sparrow



Joined: 13 Aug 2005
Posts: 489
Location: The part of London with the smallest number of birds

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PostPosted: Sun Jul 23, 2006 3:08 pm    Post subject: Reply with quote

I was wondering about that. But then if mobile phones can play those high frequencies I'm sure my Pc could.. unless of course the story of the ultrasonic ringtone was just a bit of fiction.. like those stupid baa baa rainbow sheep stories everyone always falls for Rolling Eyes

the problem is how to get hold of a sound clip in the first place.

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Hampshire Hogg



Joined: 28 Nov 2005
Posts: 119

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PostPosted: Mon Jul 24, 2006 5:19 pm    Post subject: Reply with quote

How do you know when you have got one.???
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Silver Sparrow



Joined: 13 Aug 2005
Posts: 489
Location: The part of London with the smallest number of birds

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PostPosted: Tue Jul 25, 2006 9:56 pm    Post subject: Reply with quote

what? good speakers?! LOL who knows! its an experiment bound to failure, but one that i want to try anyway Cool
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Nobby



Joined: 24 Mar 2005
Posts: 327
Location: Kenley Surrey UK

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PostPosted: Tue Jul 25, 2006 10:34 pm    Post subject: Reply with quote

Do bat sounds have side tones?

I mean if they produce sound at 44KHz then they would also produce a 22KHz sound at half power.

Perhaps a human with good hearing is hearing this sound?

Brett.
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Karwin



Joined: 24 Mar 2005
Posts: 2543
Location: 61N25E

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PostPosted: Mon Jan 31, 2011 3:38 pm    Post subject: Reply with quote

Twenty years younger I remember having heard Eptesicus nilssoni. It was like tinnitus from inside my head, but I noticed I heard that always when the bat flew over my head. Here is instead ultrasounds of Eptesicus & Myotis progressed with Pettersson D200 bat detector. The video is by Finnish Association for Nature Conservation, recordings are by me Cool
http://www.youtube.com/watch?v=DOZP7MYVD_s

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Peter



Joined: 21 Apr 2005
Posts: 772
Location: South-west England

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PostPosted: Mon Jan 31, 2011 10:48 pm    Post subject: Reply with quote

Karwin wrote:
Twenty years younger I remember having heard Eptesicus nilssoni. It was like tinnitus from inside my head, but I noticed I heard that always when the bat flew over my head. Here is instead ultrasounds of Eptesicus & Myotis progressed with Pettersson D200 bat detector. The video is by Finnish Association for Nature Conservation, recordings are by me Cool
http://www.youtube.com/watch?v=DOZP7MYVD_s


Well I never thought of using YouTube for that.

Isn't the point Karwin that these are indeed sounds created through a bat detector and are not those that we can hear, as such? What we need is the unfiltered version...good those these are of course...!

All sounds a bit like someone who can tap dance incredibly fast.. Very Happy
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Karwin



Joined: 24 Mar 2005
Posts: 2543
Location: 61N25E

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PostPosted: Tue Feb 01, 2011 6:22 am    Post subject: Reply with quote

Peter wrote:
Isn't the point Karwin that these are indeed sounds created through a bat detector and are not those that we can hear, as such? What we need is the unfiltered version...good those these are of course...!
Bat detector amplifies ultrasounds (Ultravox Mr. Green ) to our ears.
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Karwin



Joined: 24 Mar 2005
Posts: 2543
Location: 61N25E

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PostPosted: Tue May 17, 2011 7:26 am    Post subject: Reply with quote

Martin wrote:
I think a device was demonstrated as an effective method of dispersing unwanted youths by emitting high frequencies that only humans below a certain age could hear !
You're right, in a mall of nearby town here in Finland they have used such device.
Peter wrote:
these are indeed sounds created through a bat detector and are not those that we can hear
Continuing with experiments on detector bat sounds, here's a bat song I performed some months ago in Finnish year-of-the-bat seminar. All instruments sounds are edited from detector sounds, that were originally created by Finnish bats. Song starts at 0:47 and the words list names of Finnish bats in Finnish, Swedish & Latin.
http://www.box.net/shared/3100h7grm7

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