8 Convolution and Iurpulsc Nesponsc i 76 The result, i s then inimrdiatdy obt,aincd, i3nd it corrcspoirds to (4.15) .4.4.3 Delay Circuits tlw input signal at A delay circuit is a fixed t i u w clclay t o , rt from the delay, e signal rcrriains unc circuit to a d d t a inipdse h i t ) nrnst l x lh(' hysterrl v~'sp0"sc' of a d impulse Jchyed by I'o (see Figure 8.20) h ( / )= S(L - L(]) , il ddta (8.58)