Specifications

6.4 Time dep endent signal shaping 69
wave? The scaling factors in Fig. 6.21 are given for the benefit of the graphs.
Perhaps you can see from the first graph that
d
dx
cos(x) = −sin(x) (6.3)
and
d
dx
sin(x) = cos(x) (6.4)
More useful perhaps, is the result of differentia ting a phasor. While the
phasor moves slowly its g radient is a small constant, but at the moment it
suddenly returns the gradient is very high. So, differentiating a phasor is a way
for us to obtain a brief impulse spike.
References
Text books
Puckette, M. (2007) “The theory and technique of electronic music” ISBN 97 8-
981-270-07 7-3
Papers
McCartney, J. (1997) “Synthesis witho ut Lookup Tables” Co mputer Music
Journal 21(3)