Voice activated switch

[tpdasf]

I'm trying to make a small circuit that emits a sound that is annoying
to a barking dog but can't be heard by people (This is for my dog, to
get him to stop barking at the neighbor's children). So I guess I have
a few questions:

1. I've heard that 25-35 KHz is the ideal range to try with dogs, so
what kind of speaker would I need to buy? Should I just look up any
small speaker that has that range and try that? I would obviously have
to see if it had any effect on the dog before I built the rest of the
circuit, so it would have to have a range of around 30-40 feet and moderately loud.

2. I'm thinking of using a Voice activated switch such as
https://www.electronics-lab.com/projects/sensors/025/index.html . A
dog's bark can be up to 105db I have read. Good idea? bad idea?

Thanks.

 

[audioguru]

The special old Motorola IC has not been made for many years.

A speaker is driven by a power amplifier.
Most speakers have trouble above 5kHz. Many tweeters are very fragile and don't go above 17kHz.
Old guitar speakers had a piezo tweeter that goes up to 20kHz and maybe higher. The piezo tweeters are still available.

 

[crutschow]

Of course such ultrasonic bark preventers are commercially available in many pet stores. Or do you just prefer to build your own?

 

[audioguru]

Don't they just give the dog a shock (high voltage jolt) if it barks?

 

[circe]

Sorry for pushing up this old topic, but I want to do the same and there wasn't too much discussion about this.

I am still in the "collecting information stage". A few things I found out before I asked my question:

• A high pitch noise may stop a barking dog
• Dogs don't like the 20-30KHz range
• I have some speakers that give me 100dBa at 25KHz (and go up to 50KHz)
• I like to use a simple 555 based sound generator to find the right frequency
• It will not work on all dogs (never mind that)
• I know that there are solutions on the market, still........

The sound output circuit should be no problem.

But I like to use the barking as a trigger. Therefore I like to get some ideas how to analyze an incoming sound and filter out not-barking noises.

 

[audioguru]

• A high pitch noise may stop a barking dog

many dogs bark at a high pitched noise.

• Dogs don't like the 20-30KHz range

Old gogs cannot hear high frequencies like old people.

• I have some speakers that give me 100dBa at 25KHz (and go up to 50KHz)

I doubt it. Most speakers barely go to 20kHz. Maybe you have a piezo "whistle".

But I like to use the barking as a trigger. Therefore I like to get some ideas how to analyze an incoming sound and filter out not-barking noises.

Audio is audio. How will you detect a dog barking and not somebody hammering on a wooden fence?

 

[circe]

How will you detect a dog barking and not somebody hammering on a wooden fence?

This was my question. A dogs bark will be different from other noise. In google I can dictate text, so it is possible. The question was how.

 

[audioguru]

Maybe you can use a computer with voice recognition software and the dog barking is a voice.
But maybe it will detect the barking from only one dog.

 

[circe]

Maybe you can use a computer with voice recognition software and the dog barking is a voice.
But maybe it will detect the barking from only one dog.

Google speech-to-text works as long as it's spoken clearly and the background noise is not too high. A demo of the google online translation app in a bar failed.

But there could be different approaches. Sound spectrum analysis could be complex (= expensive). A simple 'clap switch' could be used based on a sound-silence sequence. A dog will usually bark several times with a few 10ms silence inbetween.

I think I go from there for now.....

PS: After a bit of googleing, I think NJU 7507 could be used as a sound analyzer:
**broken link removed**