Er, are you sure those are bs? When I did the program all those notes
sounded like cs to me.
On 7/11/2010 4:33 PM, Chris Smart wrote:
Blake, he's doubling frequencies because it's convenient, and an
octave higher in musical notes is twice the frequency in HZ. For
example, the A most orchestras tune to, played by the oboe, is 440 HZ.
The next highest is 880 HZ or double the frequency. 1 KHZ is
approximately 5th octave B natural on the piano. The next higher B
natural is 2KHZ, 4 KHZ gets you the next B note etc.
He's just breaking the audio spectrum up into convenient ranges of
frequencies. He could have just as easily said ok, i'm going to boost
150 HZ, or maybe 175 HZ, or maybe 190 HZ, but I doubt most beginners
could distinguish between those narrower frequency bands. he starts
with ten possible bands because they are broad enough to be easily
distinguished from one another. Get a 31-band graphic EQ, for
example, and you can break the audible spectrum up into much smaller
frequency bands.
How low can you go? Well, how low can your ears detect, microphones
pick up, and your sub produce? The lowest A on a piano is 27.5 HZ.
If you have a 5-string electric bass with the lowest B string tuned
down a full step, you get that very low A at 27.5 HZ. Is there much
going on below that in most recordings? Not really. Eventually you
end up in the sub-sonic range where things are felt as vibrations, not
really heard by our ears. Apparently elephants communicate over
several miles down in that range.
Some other reference points:
The lowest string on a four-string bass guitar is tuned to 1st octave
E or 40 HZ, and on a guitar it's the next highest E, at 80 HZ, if both
are in standard tuning.
If you want to find the frequency in HZ of a particulare musical note,
try the chart at:
http://www.phy.mtu.edu/~suits/notefreqs.html
Chris
P.S. Also notice how long some of those lower frequency wavelengths
get. You need at least that much space or a multiple of it for the
sound of a given note to fully develop in your listening space.
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