Pages: [1]   Go Down
Author Topic: Sound Sensor  (Read 882 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 1
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I need to do a project to inhibit the barking of dogs.
I need to put a sound sensor in the kennel. When the sensor detects a loud sound, triggering an alarm.
The sound sensor that detects bought only the sound that is very close to him and I needed a sensor that captures ambient sound.
Can anyone give me an idea?
Logged

Offline Offline
Faraday Member
**
Karma: 61
Posts: 2874
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

If you can invent a sensor which "only detects sounds very close"  then you will make a lot of money.

Sound sensors don't care how far away the noise is,  they only care about the magnitude of the noise
at the location they are measuring it.

A small noise nearby is indistinguishable from a large noise a long way away.
Logged

Lost Wages
Offline Offline
Full Member
***
Karma: 11
Posts: 103
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

If I understand you, I think what you want is noise cancellation. You want to amplify the dog bark but not any ambient noise.  I have link to a noise-cancelling headphone project that cancels the ambient noise and passes the music.  The basis of the circuit is a differential op-amp.

Take a look here http://headwize.com/?page_id=684.
Logged

Pittsburgh, PA, USA
Offline Offline
Faraday Member
**
Karma: 96
Posts: 4773
I learn a bit every time I visit the forum.
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Noise cancellation has practical limits on the space it will work in. But it can work in rooms and car interiors though I think it's nothing like easy to do well.

Logged

I find it harder to express logic in English than in Code.
Sometimes an example says more than many times as many words.

0
Offline Offline
Full Member
***
Karma: 5
Posts: 233
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I think you could build a small sensor board that would trigger an alarm based simply upon the volume.  The false alarm rate would probably be very low given that the ambient noise level in the kennel probably rarely gets to a volume close to that of the dog barking.  I do not think you need a noise canceling system given the relative volumes. 

You could set up the sound sensor to light an LED and monitor it to see if you have a false alarm problem so as not to confuse the dogs.  Running just the LED with the sensor would also be required so you could set the threshold at a level to ignore ambient but trigger on barking.  A filter on the sound sensor based on frequency could further reduce the false alarm rate.
Logged

Pages: [1]   Go Up
Jump to: