tell me the physics of an LED, microphone, speaker, noise, and sound.
Posted on 2010-09-13
The matter of these anti dog barking devices needs clarification as to the theory behind how they work. There are the $10 models that are advertised on TV. Then there are $59.99 models shaped like a birdhouse. Then water proof ones for $89.99 and up, with a "cone" to capture the sound of dogs barking and release the ultra sonic sound back to the dogs.
I've seen reviews on all of them and the reviews on the $10 model are not good, though many buyers are misreading the website and buying "one" and when they are billed close to $100 or more, they wonder why. They are missing the fact that they are buying a case of 12 and not a single unit, so some of the bad reviews are buyers not paying attention.
Let's discuss the $10 model. There is no simple LED to let you know the battery is still good. A small LED and two wires to a battery is pretty simple technology.
However these cheap devices do not have an LED. So, with the dogs the only ones who can hear the sound, and no LED, it easy to wonder if it works or not, and how dead is your battery.
Moving on to the birdhouse design, they may be made like a bird house but you can tell it is a camera like device, as it looks phony. And if you are trying to control your neighbors dogs you sure don't want an obvious device. On their website there are 34 reviews, and 16 said it worked, 8 said it did not, and the other 10 users made comments on other features of the device such as ease of use, cost, size of dog it works on, etc.
So, can someone explain the theory and the physics behind a device being able to detect a dog bark over other noises like music, cars, trains, etc. with a built in microphone. That microphone picks up the dog's barking.
Is it because the dog's bark is a certain frequency and microphones can be made to only pick up certain frequencies?
And this device retrieve's the dog's bark, and then through a speaker sends out an ultra sonic sound that only dogs can hear.
A physics professor on another forum said, "save your money and go to Google and locate ultra sonic ring tones (for a cell phone) and record them and play my stereo for the dogs. Teenager scan hear them but their adult teachers can not".
This sounded good and he was confirming the validity of the ultra sonic sounds these devices emit. However, I need a device that is triggered by the barking, penalizes the dogs, and turns off. I could not let my stereo run continuously without a cassette tape that was endless, like the ones used on old voice mail telephone machines.
So, how can company "A" afford to sell the microphone-speaker technology for $10, but can not afford to add an LED, and they do not sell the a/c adapters.
The birdhouse device does not have an a/c adapter either.
Co-conspiracy with the battery makers?
The more expensive model does come with an a/c adapter and a 10 foot cord.
So, tell me how a device can pick up dog barks and return a sound only they can hear.
What is the cost to create a device that can do that?
Low cost enough to be able to sell them for $89.99?
It seems if the $10 device company sold 1 million devices for $10, and then charged their $7.99 for shipping and handling, but the devices can be shipped for about $2.00, then all they have to do is give a refund to all 1 million users, and they still make $6.00 per unit = $6 million (less cost to make the plastic device, the small circuit board inside, and the packaging).
Explain the physics behind how these devices work.
They all say it does not work on all dogs. I'd expect a chi hau hau and a great dane have very different barks and the device could get confused on some dogs.
Sign me as a person who has never lived in a community that allowed outside dogs (35 years) and now two are caged 24/7 only 20 feet from my bedroom window (3 weeks).