Yes, problem is the frequency response of the phone's speaker. They are not usually that great :(
Read the full replyWe have a deaf cat who apparently can still hear some high tones.
So I was wondering if a dog whistle might aid communication.
Then I wondered if there was a dog whistle app for a mobile phone.
There do seem to be tone generator apps; has anyone tried one of these?
Those of a certain advanced age and degraded TV watching habits may perhaps remember Bruce Forsyth and The Generation Game and "HERE KITTY KITTY".
Technology moves on (I hope).
Cheers
Dave R
Yes, problem is the frequency response of the phone's speaker. They are not usually that great :(
You would probably want something with a piezoelectric transducer to be effective, I don't think phone speakers fall into that category. Ancient ultrasonic TV remotes used to annoy dogs. You can get inexpensive mosquito repellers eg. Ebay 282108117914, it claims to work on mice.
I am surprised if high & ultrasonic frequency weren't the first to be affected in canine deafness.
depending what it is, they aren't that bad up high. A conventional speaker for example radiates from the voice coil, not the cone, at very high frequencies.
They go above adult upper hearing frequencies quite deliberately, so that kids can setup ringtones which adults can't hear.
I thought that was an urban myth? The speaker/sounder on my current phone cuts out at 12kHz, obviously other phones may do more.
Yes I can still hear to 18Khz.
I should qualify that, I can hear 18Khz, but at a much reduced volume. Realistically I would say my hearing starts to tail off around 14Khz, which isn't bad for my age :)
No filter ever made 'cuts out' at a give frequency. IT just attenuates, so you can still produce sound beyond that, just not very well.
Yes Mr Pedantic, you know exactly what I meant :)
Well 'know', I didn't. You implied that beyond the 'cutoff' no sound at all would be produced, and therefore applications that tried were doomed to failure.
But the term 'cut off' in this instance is a descriptive term to mean a level of -3db which is half the volume.
Bit of an urban myth that one. Hearing doesn't cut off dead at a certain frequency as you get older. The sensitivity of the ear to those upper frequencies lessens. And upper frequencies are more easily attenuated by an obstruction - like being in a pocket.
Basically, it might work with your grandparents - but a bit risky with your parents.
doesn't work if your grandparents are 6ft under either :-)
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