Vin,
I did realise that it was myself vibrating, not the TV! However, your
point is well made about high and low notes. Having always been a low
player, my experience of 'frizzy' pictures in the high tessitura are
pretty limited!
Ralph R. Hall, brasshausmusic.com
On 29 May 2009, at 22:45, Vincent Duval wrote:
Ralph Hall wrote:
"As a side issue, playing whilst watching TV makes the picture
appear to 'frizz' and vibrate."
Actually, Ralph, if I'm not mistaken, that is the result of your
eyeballs shaking around in their sockets. I'm not kidding. It
doesn't have anything to do with the soundwaves generated by your
horn effecting the electrical appliances in the room. Ask someone
else in the room to look at the television and they won't see the
"frizz" that you're seeing as you play. Try playing a tuba and the
distortion will appear greater (I've done this.) Bigger eyeball
shaking. The phenomenon can also very noticeable if you're looking
at a computer screen as you play.
<>
I just took a break from writing this response to verify what I
wrote above. There was no noticeable distortion on my computer
screen as I played a few long tones on my horn. I went into the
other room and turned the TV on to the "TV guide" channel so I would
have some text to look at. Again, no noticeable "frizz" until I
started rattling some low register notes. The text on the TV seemed
to be vibrating - to me. My son saw no change to the screen
whatsoever.
This is not something that I've ever noticed with print on paper.
However, I first noticed it on a computer screen one day at school
while playing tuba with my students, and it looked to me as though
my entire computer screen was undulating (I was about twenty-five
feet away). At first I thought it *was* the computer, but when I
pointed out the monitor to my kids, they didn't see what I was
talking about. My tuba student played some notes and immediately
understood what I was referring to - but when he did, *I* didn't see
any change in the screen. I think that ambient lighting, distance
from the screen, and even how tired one is may influence the degree
of "shaking" that one perceives (in addition to the amplitude and
the frequency of the vibrations that one is creating).
FWIW. Which may not be much. I'm sharing this because I just
remember being surprised and amused when I realized that something
which I originally took to be an external phenomenon (Look! the
soundwaves from the tuba are causing some kind of interference with
the computer monitor!) turned out to be a physiological one (Oh! I
guess my eyes are rattling around in my head!)
Vin Duval
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