Frogs: The ultimate midrange?

Cal Weldon · 24th April 2004, 05:48 AM

After enjoying a wonderful oyster dinner, I'm relaxing on the front porch with an apertif, listening to the frogs in our side yard pond.

These frogs are only about 2" long if you stretch them out. Maybe 3/4 - 1" in the body.

When I look at them through the binoculars from the front porch, the membrane that comes out and makes the croak is about 3/4" across. As you know, frogs are very loud. I live on a regular city lot and they keep the restless sleepers awake at this time of year.

I am only estimating but from about 40 ft away they are able to deliver around 85 dB. This is more than loud enough to interupt conversation. Not to mention startle your friends when they get going.

What kind of acoustic energy is needed to make it that loud from an organic membrane only 3/4" diameter from that distance?

Just curious on a Friday night,

Cal

jleaman · 24th April 2004, 05:55 AM

Friday.. WOA i ant believe this week has flown by.. WOA..

Cal Weldon · 24th April 2004, 05:59 AM

Quote:

Originally posted by JasonL
i ant believe this week has flown by

i ant believe it either

How are things in the new digs, Nanaimo man?

Cal

jleaman · 24th April 2004, 06:07 AM

Cross finger's CRoss Fingers Hope to get a job @ Shaw Cable. : O) WOOT. !

Stephen D · 24th April 2004, 06:50 AM

Gee, I wonder what the Xmax is on that membrane?

planet10 · 24th April 2004, 09:41 AM

Quote:

Originally posted by JasonL
Hope to get a job @ Shaw Cable

I just hope you get a job you can live with

dave

SY · 24th April 2004, 11:40 AM

Dave, are you up early or late?

The cricket is what always amazed me. From some pretty tiny generators, it produces a sound which can carry for a kilometer in all directions.

sreten · 24th April 2004, 12:25 PM

Quote:

Originally posted by Cal Weldon
After enjoying a wonderful oyster dinner, I'm relaxing on the front porch with an apertif, listening to the frogs in our side yard pond.

These frogs are only about 2" long if you stretch them out. Maybe 3/4 - 1" in the body.

When I look at them through the binoculars from the front porch, the membrane that comes out and makes the croak is about 3/4" across. As you know, frogs are very loud. I live on a regular city lot and they keep the restless sleepers awake at this time of year.

I am only estimating but from about 40 ft away they are able to deliver around 85 dB. This is more than loud enough to interupt conversation. Not to mention startle your friends when they get going.

What kind of acoustic energy is needed to make it that loud from an organic membrane only 3/4" diameter from that distance?

Just curious on a Friday night,

Cal

I would suspect the membrane is used to form a resonant cavity,
and its changing shape changes pitch rather than producing the
sound, what actually drives the resonant system I don't know.

sreten.

rabbitz · 24th April 2004, 02:13 PM

One for the frog freaks....... accidently came across this when I was trying to find some info on Bullfrog Speakers in Oz.

http://www.neurocomputing.org/amphib..._behavior.html

planet10 · 24th April 2004, 06:49 PM

Quote:

Originally posted by SY
Dave, are you up early or late?

20 to 2 isn't all that late on a Friday night.... is 3 AM early or late?

dave

24th April 2004, 05:48 AM	#1
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Frogs: The ultimate midrange? After enjoying a wonderful oyster dinner, I'm relaxing on the front porch with an apertif, listening to the frogs in our side yard pond. These frogs are only about 2" long if you stretch them out. Maybe 3/4 - 1" in the body. When I look at them through the binoculars from the front porch, the membrane that comes out and makes the croak is about 3/4" across. As you know, frogs are very loud. I live on a regular city lot and they keep the restless sleepers awake at this time of year. I am only estimating but from about 40 ft away they are able to deliver around 85 dB. This is more than loud enough to interupt conversation. Not to mention startle your friends when they get going. What kind of acoustic energy is needed to make it that loud from an organic membrane only 3/4" diameter from that distance? Just curious on a Friday night, Cal __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

24th April 2004, 06:50 AM	#5
Stephen D diyAudio Member Join Date: Dec 2003 Location: In a house	Gee, I wonder what the Xmax is on that membrane? __________________ You thought I had it!?... I thought you had it!

24th April 2004, 11:40 AM	#7
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Dave, are you up early or late? The cricket is what always amazed me. From some pretty tiny generators, it produces a sound which can carry for a kilometer in all directions. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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24th April 2004, 05:55 AM	#2
jleaman Banned Join Date: Apr 2002	Friday.. WOA i ant believe this week has flown by.. WOA..

24th April 2004, 06:07 AM	#4
jleaman Banned Join Date: Apr 2002	Cross finger's CRoss Fingers Hope to get a job @ Shaw Cable. : O) WOOT. !

24th April 2004, 02:13 PM	#9
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	One for the frog freaks....... accidently came across this when I was trying to find some info on Bullfrog Speakers in Oz. http://www.neurocomputing.org/amphib..._behavior.html

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