Am I the only one that notices they can hear within the ultrasonic range??
For quite some years now, I can hear bats at night, can hear ultrasonic bug/pest repellers and have even heard the faint whistle of a few dog whistles..it has always reminded me of the scene from Teen Wolf when Michael J. Fox hears the kid blowing the dog whistle.
Is this really all that uncommon?
For quite some years now, I can hear bats at night, can hear ultrasonic bug/pest repellers and have even heard the faint whistle of a few dog whistles..it has always reminded me of the scene from Teen Wolf when Michael J. Fox hears the kid blowing the dog whistle.
Is this really all that uncommon?
Well, the weirdest thing is I've been told since I was a kid I have hearing loss and actually have scar tissue and a tube lodged in my left ear. At the same time, I pick up on barely audible sounds all the time that friends and family don't until I point it out to them and force them to really focus.
I've always noticed weather effects everyone's hearing too. On certain days everyone else seems to be shouting and talking excessively loud, my ears are hyper sensitive and everyone tends to hurt them. I must be on the opposite end of the slope of those air pressure and humidity influences.
Still, I hear these ultrasonics pretty loud and clear. Stepped outside last night and as I often do, heard and then saw a bat. I hear them loud enough and clear enough that I can usually zoom right in on them to spot them. It's loud enough that I've always assumed everyone hears them though.....
I'm a freak!
I've always noticed weather effects everyone's hearing too. On certain days everyone else seems to be shouting and talking excessively loud, my ears are hyper sensitive and everyone tends to hurt them. I must be on the opposite end of the slope of those air pressure and humidity influences.
Still, I hear these ultrasonics pretty loud and clear. Stepped outside last night and as I often do, heard and then saw a bat. I hear them loud enough and clear enough that I can usually zoom right in on them to spot them. It's loud enough that I've always assumed everyone hears them though.....
I'm a freak!
Just a strange thought. Ears may be subject to gain/bandwidth product. Your ears behaviour may have confused the doctor.
I had a friend that couldn't sit too close to a TV as he disliked the 16kHz whistle
I used to be able to hear beyond 20kHz. When I got my first good tweeter, I hit it hard with the sig gen. IIRC, I'm sure I could hear at least 26kHz.
I had a friend that couldn't sit too close to a TV as he disliked the 16kHz whistle
I used to be able to hear beyond 20kHz. When I got my first good tweeter, I hit it hard with the sig gen. IIRC, I'm sure I could hear at least 26kHz.
Oh I confused the doctors and the stupid hearing test lady that came to our school, my hearing was well beyond the normal range and the fools couldn't figure it out. The air pressure of the test rooms alone was deafeningly loud. So loud that it would drown out the test tones. Meanwhile they thought I was suffering hearing loss and continually sent me to specialists and screwed with my ears. Had tubes 3 or 4 times I think it was.
Another variable was simply the humidity and air pressure these "Einsteins" never accounted for which greatly effects everyone's hearing. Guess they gotta maintain their salaries some how. The hearing tests they use are the most scientifically faulted audio tests I have ever encountered in my life.
I've had the same issues with a LOT of TV's as your friend, the whistle and hum of some sets are unbareable and some actually hurt my ears.
I've toyed around with some ultrasonic transducers and test tones and hear the high frequencies far beyond what's claimed to be within the human hearing range but... I'm certain anyone could hear these pitches.
Maybe these "specialists" just aren't that good at what they make their living from and the human hearing range is much larger than they realise. I never saw other kids tested more than once a year, if that. I'm inclined to believe most anyone could hear the bats and other noises I do but..maybe not.
Another variable was simply the humidity and air pressure these "Einsteins" never accounted for which greatly effects everyone's hearing. Guess they gotta maintain their salaries some how. The hearing tests they use are the most scientifically faulted audio tests I have ever encountered in my life.
I've had the same issues with a LOT of TV's as your friend, the whistle and hum of some sets are unbareable and some actually hurt my ears.
I've toyed around with some ultrasonic transducers and test tones and hear the high frequencies far beyond what's claimed to be within the human hearing range but... I'm certain anyone could hear these pitches.
Maybe these "specialists" just aren't that good at what they make their living from and the human hearing range is much larger than they realise. I never saw other kids tested more than once a year, if that. I'm inclined to believe most anyone could hear the bats and other noises I do but..maybe not.
There are certainly people who hear above 20 kHz.
But be aware that not all sounds caused by bats are above 20 kHZ. My hearing isn't that good anymore at the upper end (fc approx 16 kHz) but I can hear them anyway. They use the very high frequencies for their sonar and lower ones for communications.
Regards
Charles
But be aware that not all sounds caused by bats are above 20 kHZ. My hearing isn't that good anymore at the upper end (fc approx 16 kHz) but I can hear them anyway. They use the very high frequencies for their sonar and lower ones for communications.
Regards
Charles
DrFrankenstein said:
Having an excellent HF hearing, I still focus my efforts in the 50Hz-15KHz region of my setup. My setup doesn't play above 15KHz (TAD4001 on horns and 12'' altec 414 BR biamped) yet I have no wish for it to do so. Even though I hear "way above" 20KHz, I don't consider it important at least not for the types of music I tend to listen to..
I think musical content and high frequencies all cooks down to subjective preference. Agreed, there is content above, and for a HT setup I would definitly go for supertweeters.
There is a piezo tweeter I'm very fond of that has very wide frequency response and great power handling.
The Motorola/CTS KSN1165
1,800 Hz - 30,000 Hz @ 200 watts RMS w/exciter lamps built in
There is also an after marktet lower end version floating around that handles about 1/3 the wattage but I think it sounds a bit better and it's cheaper anyway. They sound great wide open or a with a little resistance to tame them but I think they generally perform best wide open. I've rebuilt a few 2 way systems with everything wired wide open and have gotten incredible results when teaming the right woofer with these tweeters.
The broad frequency range allows me to keep the treble on my stereo flat, I merely have the loudness switch engaged.
A lot of guys don't like piezos but I think they're the wave of the future. You just need to know which ones are worth your time because the vast majority generally do sound like garbage, regardless of stuffing 10 of them in one box.
The Motorola/CTS KSN1165
1,800 Hz - 30,000 Hz @ 200 watts RMS w/exciter lamps built in
There is also an after marktet lower end version floating around that handles about 1/3 the wattage but I think it sounds a bit better and it's cheaper anyway. They sound great wide open or a with a little resistance to tame them but I think they generally perform best wide open. I've rebuilt a few 2 way systems with everything wired wide open and have gotten incredible results when teaming the right woofer with these tweeters.
The broad frequency range allows me to keep the treble on my stereo flat, I merely have the loudness switch engaged.
A lot of guys don't like piezos but I think they're the wave of the future. You just need to know which ones are worth your time because the vast majority generally do sound like garbage, regardless of stuffing 10 of them in one box.
Of course, you are a certified bat expert and know exactly what frequencies you are listening to 
Bats make many audio frequency calls. If bat noise really affects you that much - TV flyback whine would be murder....
Also, sight better than 20/20 is not that unusual, 20/20 is more like an average or a standard than a line below which your visual acuity is considered "freakish". I can't see the big E from 3 feet away (-8 diopters nearsighted) without correction, but with glasses I am 20/15 and with contacts I was 20/10.
Bats make many audio frequency calls. If bat noise really affects you that much - TV flyback whine would be murder....Also, sight better than 20/20 is not that unusual, 20/20 is more like an average or a standard than a line below which your visual acuity is considered "freakish". I can't see the big E from 3 feet away (-8 diopters nearsighted) without correction, but with glasses I am 20/15 and with contacts I was 20/10.
I e-mailed with an audiologist recently expressing concern that the highest slider on most EQs didn't have nearly the audible effect for me that it used to. He said that standard medical hearing tests only reach up to 8000hz - as this is the range you really need to hear human speech. "A hearing loss at 20,000hz is clinically insignificant," he said. Well, it's not insignificant to me!
I downloaded a simple tone generator and found that I could just barely perceive (not really hear!) a sine wave at 18,000hz. That made me feel a little better. Still, it's disheartening to listen to nighttime sounds, then cup my hands behind my ears and hear nighttime sounds as they were in my younger days...
As a kid, I could very clearly hear the 'supersonic' sounds made by department store security systems. While outside the house, I could hear somebody turn on the TV inside. Sounds all felt like they were happening right next to my ears. Now they feel more distant...
Vision's pretty crummy, too - roughly -6.5 diopter for me. And a touch of astigmatism.
I downloaded a simple tone generator and found that I could just barely perceive (not really hear!) a sine wave at 18,000hz. That made me feel a little better. Still, it's disheartening to listen to nighttime sounds, then cup my hands behind my ears and hear nighttime sounds as they were in my younger days...
As a kid, I could very clearly hear the 'supersonic' sounds made by department store security systems. While outside the house, I could hear somebody turn on the TV inside. Sounds all felt like they were happening right next to my ears. Now they feel more distant...
Vision's pretty crummy, too - roughly -6.5 diopter for me. And a touch of astigmatism.
RON E my hearing is pretty sharp, I can site 3 distinct bat sounds I hear.
There is the chirp which would be for communication.
Then there are two distinct screaches which would be for sonar. One is short and very thin sounding which I assume is for close ranges, the other is more gutteral and powerful with a bit more duration which anyone would naturally assume is for longer ranges.
I have been around other people over the years that did not hear the specific screaches I am insisting must be for sonar when I did. On the other hand, I've been around people who have heard the loud and distinct chirps they some times make which would be for communication purposes.
My vision was 15/20 in the left eye and 13/20 in the right eye last time it had been checked and I wear no corrective lenses at all.
Geauga majority of sounds we encounter as humans are within the midrange bandwidth but I'd probably be upset too if I wasn't hearing the tonal difference on EQ's and such. My ability to clone sound systems and amp tones through tweaking and mods is my livelyhood.
There is the chirp which would be for communication.
Then there are two distinct screaches which would be for sonar. One is short and very thin sounding which I assume is for close ranges, the other is more gutteral and powerful with a bit more duration which anyone would naturally assume is for longer ranges.
I have been around other people over the years that did not hear the specific screaches I am insisting must be for sonar when I did. On the other hand, I've been around people who have heard the loud and distinct chirps they some times make which would be for communication purposes.
My vision was 15/20 in the left eye and 13/20 in the right eye last time it had been checked and I wear no corrective lenses at all.
Geauga majority of sounds we encounter as humans are within the midrange bandwidth but I'd probably be upset too if I wasn't hearing the tonal difference on EQ's and such. My ability to clone sound systems and amp tones through tweaking and mods is my livelyhood.
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