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Musical-Applications-of-Microprocessors-2ed-Chamberlin-H-1987

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MUSIC SYNTHESIS SOFTWARE 661<br />

,------------------------_--.. HP<br />

+<br />

~NOTCH<br />

+<br />

INPUT<br />

J-G'---1>--_-- LP<br />

A<br />

INPUT, HP, SP, LP, NOTCH<br />

Q,FREQUENCY<br />

A,C<br />

s.xxxxxxx<br />

X.XXXXXXX<br />

S. XXXXXXXXXXXXXXX<br />

SEQUENCE OF CALCULATIONS<br />

STEP OPERATION<br />

BINARY REPRESENTATION<br />

E S 'S.x X X X X X XiX X X X X X X<br />

X FREQ x.x X X X X X X<br />

F SX,XXXXXXXXXXXXXX<br />

~H Sx,xxxxxxxxxxxxxx<br />

G<br />

~xXXXXXX"X X X X X<br />

-LP OUTPUT<br />

E<br />

X a<br />

A<br />

S'S.XXXXXXX'XXXXXXx<br />

X.X x<br />

S X.X x x x x x xxx xx x x X<br />

-A SX.xxxxxxxxxxxxxx<br />

-G SS.XXXXXXXXXXXXXX<br />

+ Input S.X X X X X X X 0 0 0 0 a 0 a<br />

------e- s ,s.x x x x x x X,X x x x x x X<br />

--HP OUTPUI<br />

B s~.XXXXXXX'XXXXXXX<br />

X FREQ X. X xx xxxx<br />

c s X.X x x x x x x x x x x x x x<br />

s s.x x x x x x x x x x x x x x<br />

s,s.xxxxxxx,xxxxxxx<br />

---SP OUTPUT<br />

S,X x x xx x x<br />

SoX X X X X X X<br />

S.X xxxxxx<br />

----- NOTCH OUTPUT<br />

Fig. 18-6. Signal flow diagram <strong>of</strong> fixed-point arithmetic digital filter<br />

synthesis system is considered. It can be a viable technique in dedicated filter<br />

applications such as a spectrum analyzer, however. Of course, with 8-bit<br />

samples and arithmetic, the programmer constantly walks a tightrope in<br />

keeping signal levels high to maximize SiN ratio, while keeping them low

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