5.4.3 Types offilters Fig. 5.44(b)illustrates a state-variable filter with electrically adjustable parameters. The state-variable filter provides three simultaneous outputs: a low-pass, a high-pass, and a band-pass s2/o2+2as/o,+1 (566) OOR-C/V (567) /On+2/on+1 bp (202RC /V )s (5.68) s/n+2/n+15.4.3 Types of filters Fig.5.44(b) illustrates a “state-variable filter” with electrically adjustable parameters. The state-variable filter provides three simultaneous outputs: a low-pass, a high-pass, and a band-pass: ( ) / 2 / 1 1 2 2 + + = − i n n ep s s s e e    ( ) ( ) / 2 / 1 100 / 2 2 2 2 2 2 + + = − n n c i hp s s R C V s s e e    ( ) ( ) / 2 / 1 20 / 2 2 + + = − n n C i b p s s RC V s s e e     (5.66) (5.67) (5.68)