Archive for the ‘fripp’ tag
Robert Fripp
Robert Fripp
Calculation of phase shift distance for guitar feedback?
Pioneering guitarist Robert Fripp utilized a system in which he placed a strip marked with notes between himself and the amplifier. Each marked distance from the amplifier was ideal for generating infinite sustain (feedback amplification) for a single note.
How might I calculate each distance, given the fundamental frequency of the desired note?
The fundamental equation is:
distance = velocity of propagation / frequency
The velocity of propagation is that of sound in the atmosphere which is 1128 ft / sec (under normal temperature, pressure conditions).
For example, G4 (391.99 Hz for A=440) would be:
1128 / 391.99 = 2' 10.5"
Now, this is a very simplistic approach. In reality sound velocity varies with temperature and atmospheric pressure (you'd have to recalculate every distance for Denver, versus LA) . Plus, amplifiers change signal phase, and sometimes that phase is dependant on frequency -- this will mess up the distance strip, also. Reflections off of walls will mess up a nice neat strip, too.
That's kind of a neat concept -- I'm going to try it at home.
.
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 RARE KING CRIMSON IN THE COURT OF THE CRIMSON KING HALF SPD RECORDING US $395.00
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 KEITH TIPPETT ROBERT FRIPP BLUEPRINT UK RCA JAZZ LP 1972 JULIE DRISCOLL US $226.71
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 COLIN SCOT WITH FRIENDS 1971 LP UAG 29154 UK EXCELLENT CONDITION UNITED ARTISTS US $62.52
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Robert Fripp String Quintet Kan Non Power
