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Juma Ganiyu
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Electric Bell

05/12/2015 2:13 AM

What is the sound intensity required to cover 800sq.m?

Please assist with formula..
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SolarEagle
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#1

Re: Electric bell

05/12/2015 2:42 AM

What is the nature of the bell's purpose? Fire alarm? Break alarm? End of shift?

What is the ambient noise level? 60db ? 90db?

120db is the threshold of pain....

Every time you double the distance from the source you subtract 6 dB. Every time you halve the distance to the source, you add 6 dB.

So you take the decibel level required from the furthest point and calculate the decibel level of the bell from 1 meter....

https://www.floydbell.com/learn/tone_types.php

https://www.floydbell.com/learn/faq.php

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Juma Ganiyu
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#2
In reply to #1

Re: Electric bell

05/12/2015 3:01 AM

For school area
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IdeaSmith
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#5
In reply to #2

Re: Electric bell

05/12/2015 5:30 AM

School bell? Fire alarm? Both?

I'd source a school bell system which might come with multiple bells to cover all area.

For the intensity: Not so loud but still loud enough to be heard. Like school bells never have been.

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Unredundant
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#10
In reply to #5

Re: Electric bell

05/12/2015 12:25 PM

The only way you could tell the electric bell was ringing at the grade school I attended, was when the birds flew out of the nest in it. I think they were the rare Quasimodo bird....

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adreasler
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#16
In reply to #10

Re: Electric bell

05/13/2015 10:06 AM

*Students A & B look down at bird with crushed skull that fell out of bell housing*

Student A: "What type of bird is that?"

Student B: "I don't know, but it's face sure rings a bell."

*Student C walks up*

Student C: "Is that the Quasimodo Bird?"

Student A: "No, it's not. But it's a dead ringer, isn't it?"

(Based of an old Quazimodo skit from Boy Scouts. With appologies to ... well, probably to everyone for having to put up with such a lame joke.)

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Unredundant
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#17
In reply to #16

Re: Electric bell

05/13/2015 10:27 AM

Great jokes!

maybe the OP needs a cross between a Quasimodo and a *Mileormore bird?

*Sticks its head in the sand and whistles through its bottom, it can be heard for a mile or more.

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IdeaSmith
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#21
In reply to #17

Re: Electric bell

06/04/2015 4:16 AM

... but only if you have the head in the sand too! . . .

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SolarEagle
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#7
In reply to #2

Re: Electric bell

05/12/2015 9:04 AM

I suggest a distributed system...

http://lst101.com/acoustics.html

http://www.acrovista.com/

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#3
In reply to #1

Re: Electric bell

05/12/2015 3:32 AM

For bedroom at night, sigma might be amusingly large, and even skewed.

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Circuit Breaker
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#19
In reply to #1

Re: Electric bell

05/13/2015 4:35 PM

So, 10 db good for end of shift, 130 not loud enough for start of shift? -- JHF

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IdeaSmith
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#4

Re: Electric bell

05/12/2015 5:28 AM

Sound of what?

Sound what for?

Intensity requirements?

Is it 2 x 400 m area or a circle or what?

Building?

Placa?

Firealarm?

The general formula: The larger the area the intensity does up/down (depends how you look at it) is all I can come up with.

Whats it you are doing?

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texasron
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#6

Re: Electric bell

05/12/2015 7:37 AM

85 db over an 800 ^ meter area.

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SHOCKHISCAN
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#8

Re: Electric Bell

05/12/2015 9:51 AM

I suggest you simulate the db level of my wife's voice as it most certainly exceeds all ambient noise levels and easily overwhelms any and all other sound within an 800 sq. M area.

Based on my firsthand experience I am comfortable that the high frequency and volume level is at least 90-120 db (depending on circumstance) which is more than adequate for a school bell system volume level.

However I would caution you in simulation of the high frequency and suggest you use a low frequency source as the higher frequency sometimes causes extreme agitation of the recipient.

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SolarEagle
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#9
In reply to #8

Re: Electric Bell

05/12/2015 10:49 AM

She's so shrill.....

She makes the hair stand up on my dogs back...

She can set off car alarms 50 feet away...

She can trigger neighborhood dogs to start howling for miles around....

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#11
In reply to #9

Re: Electric Bell

05/12/2015 4:14 PM

Yep!

And since a man has to do what a man has to do; I'm gonna do whatever she tells me to.

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#12

Re: Electric Bell

05/12/2015 4:38 PM

DING DONG

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old salt
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#13

Re: Electric Bell

05/12/2015 11:19 PM

What is the shape of the 800m2? This is going to be a major factor in the answer to your question. If it is circular the distance from the center to the outer limit is only 16m. For a rectangle 800m long by 1m wide the distance is 400m, quite a substantial difference. Even with a square the distance from the center to the furthest point is 20m. For a rectangle 1600m long by 1/2m wide the center point is 800m away from the furthest point, quite a difference from the 16m for the circle.

Good Luck, Old Salt

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#14

Re: Electric Bell

05/13/2015 7:37 AM

Is it inside or outside? In a quiet place in the woods surrounded by forest or open air near an ocean in the city with prevailing high winds?

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#15

Re: Electric Bell

05/13/2015 8:51 AM

If you mount the bell on a tower you can increase the broadcast range without the excess sound levels at close range.

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#18

Re: Electric Bell

05/13/2015 10:33 AM

"What is the answer to half a question?"

"Please assist with formulas so I can fake showing my work to the teacher."
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Munster
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#20

Re: Electric Bell

05/15/2015 3:22 PM

How about a mega phone and a recording of a ding dong?

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Users who posted comments:

adreasler (1); Anonymous Poster (1); Circuit Breaker (1); IdeaSmith (3); Juma Ganiyu (1); Massey (1); Munster (1); old salt (1); SHOCKHISCAN (2); SolarEagle (3); texasron (1); Tornado (1); Unredundant (4)

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