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In Reply to: Tell me, you are not B/Ssing us... posted by Homme De Terre on January 3, 2005 at 15:44:21:
Like I said in my first post: It may seem strange, but this really happens!Maybe, I should tell a bit more about the birds' behaviour:
usually, when I do play music from LP or CD, nothing special happens. With most classical and some pop-music, they start some sort of "tweeting", as if they "join in" on the music. It's the same kind of "tweeting" / "chirping" they do, when they are very relaxed, sitting very close together (like cuddling) and one starts to fall asleep slowly. At home, we do call that "they tell each other good night stories" - it's a really cute behaviour, obviously some kind of "relaxed" communication with - compared to other communication- very soft, but high-pitched chirping. I guess, in the music, some (also for our ears) audible high-frequency content triggers that behaviour (could be, that they hear something in the music, that resembles that special chirping and give an answer). I especially noticed that with classical music with strong string content and some pop-music with a lot of cymbals and hi-hats. So, this behaviour seems to have to do something with high and audible frequencies.The "nervous" behaviour with SACDs I notice is not related to any kind of special music - at least, I can see no pattern. But it seemed obvious to me, that - as soon as I play SACDs - they "wake up" (actually really do wake up, when they are asleep - they would not wake up when playing CDs and LPs at normal listening levels!) and start really nervously hop around in the cage... they seem not to like something.
So, counting two and two together my question (not a conclusion yet!) was, whether there is any difference between a CD/LP and a SACD, that could trigger that different kind of behaviour. My only explanation at that stage was, that maybe there is some kind of even higher frequency content, that I cannot hear, but triggers that. Maybe some sort of SACD-inherent ultrasonic? As I said, it's just a question and may seem strange, but I want to find out, what that could be...
I hope, now you are not thinking anymore, I am B/sing. I will do some search on ultrasonic in the forum.
Follow Ups:
So, I think nobody has a reason now to doubt the credibility of the phenomenon you've described. According to the information skramer contributed and according to what Dave says about your Maggys, it seems unlikely that your birds feel irritated by spectral components > 20kHz.
Then again, who on earth can claim that he knows *all* about how a bird's perception works?
Can you place a mic by the bird cage, record the signal, and analyze the spectrum? Maybe the cause is a side effect like, say, an oscillating amp or some sort of IM distortions and your birds get bothered by that.
check my post above. Birds have terrible high frequency hearing range. Your birds cannot hear past 12,000 KHz.Check the link I provided. Unless your "birds" are actually bats, there is no possibility they are "bothered" by ultrasonic noise.
Hisorry, did not read your answer until now - very interesting! As I said, I do have no explanation, so this was the only thing I could think of that made sense of my observations.
I'll observe them and post....
12,000 KHz should be 12,000 Hz. There must be some other explanation to what you have observed. Good Luck!
nt
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