SY said:
Forget the wife. Just think how many more speakers could be sold with a big "Bat Compatible" sticker on 'em! Hey, it worked with "Digital Ready." 🙂
se
IanHarvey said:
Sorry, no. The pressure waves in the air intermodulate/interfere as soon as they meet. That is the nature of wave propagation in a medium such as air.
pinkmouse said:
Intermodulatin' as soon as they meet? Damn. Don't even have to wait 'til after the FIRST date. It's a wonder we can hear anything with all those air molecules running around screaming "SCORE!" 🙂
se
Steve Eddy said:
Heh, but just think, if you had to, erm, "intermodulate" with every single person you met, every time you met them, you might just want a nice lie down with a cup of tea. 🙂
Hearing is basically a specialized form of touch. Sound is simply vibrating air which the ear picks up and converts to electrical signals, which are then interpreted by the brain. The sense of hearing is not the only sense that can do this, touch can do this too.
If you are standing by the road and a large truck goes by, do you hear or feel the vibration? The answer is both. With very low frequency vibration the ear starts becoming inefficient and the rest of the body's sense of touch starts to take over.
For some reason we tend to make a distinction between hearing a sound and feeling a vibration, in reality they are the same thing.
The reason that up till now it has been thought that humans can only hear 20hz to 20khz is that this test is far too frequently done wearing headphones, and of course this LOCKS OUT all the other hearing/feeling sensory information!
At least one member of each instrument family ( strings, woodwinds, brass and percussion ) produces energy to 40khz or above.
If you are standing by the road and a large truck goes by, do you hear or feel the vibration? The answer is both. With very low frequency vibration the ear starts becoming inefficient and the rest of the body's sense of touch starts to take over.
For some reason we tend to make a distinction between hearing a sound and feeling a vibration, in reality they are the same thing.
The reason that up till now it has been thought that humans can only hear 20hz to 20khz is that this test is far too frequently done wearing headphones, and of course this LOCKS OUT all the other hearing/feeling sensory information!
At least one member of each instrument family ( strings, woodwinds, brass and percussion ) produces energy to 40khz or above.
Nay9 said:
Yes! Exactly how I should have made my first point. The next question, then, would be: Can we sense the reflections? Is this how we know that an even it live?
🙂ensen.
Quote from Steve Eddy:
"In Oohashi's research, the high frequency content didn't seem to have any effect on its own. Only when it was combined with audio band frequencies. Suggesting that it only gets sensed by way of some form of intermodulation.
And Karou and Shogo's research seems to bear this out which indicates that it's a phenomenon brought about by the tranducers rather than the lack of sensory input (by whatever means) from the high frequencies themselves."
Actually, Oohashi et al. used a separate super tweeter for the ultrasonic sound, specifically to prevent any intermodulation distortion from being generated in the loudspeakers.
I haven't read the Karou and Shogo paper yet, but if they switched quickly between the sound with and without ultrasonics, their results may not be valid, as explained in the Oohashi et al. papers.
"In Oohashi's research, the high frequency content didn't seem to have any effect on its own. Only when it was combined with audio band frequencies. Suggesting that it only gets sensed by way of some form of intermodulation.
And Karou and Shogo's research seems to bear this out which indicates that it's a phenomenon brought about by the tranducers rather than the lack of sensory input (by whatever means) from the high frequencies themselves."
Actually, Oohashi et al. used a separate super tweeter for the ultrasonic sound, specifically to prevent any intermodulation distortion from being generated in the loudspeakers.
I haven't read the Karou and Shogo paper yet, but if they switched quickly between the sound with and without ultrasonics, their results may not be valid, as explained in the Oohashi et al. papers.
MarcelvdG said:
That wouldn't prevent it. They sent all the information above 26kHz to the supertweeter so the supertweeter handled multiple frequency components which means the supertweeter could indeed produce intermodulation components.
What Karou and Shogo did was use a syntheized stimulus tone which had five frequency components above 20kHz. Each of those five frequency components were fed to a separate driver so that each driver was fed a single frequency. Therefore none of the drivers would produce any modulation products of the stimulus tone.
But by the same token, because Oohashi et al. fed everything above 26kHz to just one driver, their results may not be valid due to intermodulation distortion produced by the supertweeter.
se
Sorry, my Czech is pretty lousy!
My last time in Prague, though it was fun to go to the various halls and listen to classical music, I had the most fun listening to The Bridge Band playing Dixieland. Weird fun.
My last time in Prague, though it was fun to go to the various halls and listen to classical music, I had the most fun listening to The Bridge Band playing Dixieland. Weird fun.
The "Bridge Band" 😉 (probably Charles Bridge from 1348) - I can imagine 😉 . Next time you come to Prague let me know. My last visit to US was Columbus, Ohio in 2002.
That's the one. The band was fun to listen to, and on the other end of the bridge was a stand run by one of the oddest artists I've ever met- wears horns. Prague is a great city! I might be back this winter.
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