Re: Can I do this with a uProcessor?

On Sat, 26 May 2007 10:54:17 -0700, joseph2k wrote:
krw wrote:
quiettechblue@xxxxxxxxx says...
Rich Grise wrote:
....
I've found that anything below -20 dB is inaudible anyway, except
for the subliminal effects, if any. :-)

Rich, "-20 dB" with no units indicator is a ratio between two signals,
not
an absolute value. -20 dB referred to a shuttle takeoff at 1000
meters is
still very, very loud. -20 dBm is still a solid signal, about what
you get
from a telephone with a soft voiced person. What scale did you really
mean?

I read it as a -20dB signal is inaudible buried in the 0dB signal (I.e.
"noise *ratio*").

The human ear routinely picks out such signals with surprizing ease and
regularity. A trained ear can dig a signal out from under as much as 40
dB stronger noise. But in context i do not think that direction that
Rich intended to apply the ratio.

OK, Lucy, lemme 'splain. I was basing my figures on something I heard
about 15 or 20 years ago when I was all into new-age stuff, and yuppies
were spending lots of money on aromatherapy and self-help books and that
sort of thing. One of the products that the new-age yuppies were buying
was "subliminal tapes", where you listen to a tape of maybe the waves at a
seashore, or a forest, or something like that, while, dubbed in with of
the sound of the surf, there's a human voice mixed in, but attenuated by
~20 dB, which supposedly sneaks its way into your subconscious and tells
your mind how to make lots of money or whatever. It's kinda like hypnosis
- there's some guy saying stuff like, "you are successful, you are
beautiful, the Universe loves you..." and crap like that.

Well, I looked into that -20dB "sumliminal" level because my clever idea
was to offer people a service where they could read their own affirmations
onto a tape, and I, in my mad metaphysicist's la-bohr-a-tory, would dub
it onto a tape of the ocean, for a fee.

And I just had an adder where the voice tape was attenuated 20 dB or so.

The thing never got off the ground, and the whole new age thing seems to
have fizzled out, but I _did_ notice that -20dB made it "virtually"
inaudible to me, but that's 20 dB down from the sound of the ocean,
which is basically noise in the first place. ;-)

Thanks,
Rich

.

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