. The Bell System technical journal . 2. NDICIAL RESPONSE Fig. 9—String oscillograph characteristics—frequency response and indicial response withdifferent amounts of damping. The curves 7, 8, and 9 show that when the low frequencies are absent, theindicial response becomxs too difficult to interpret. We must restrict ourmeasurements to systems which are ideal at the low frequencies in order tointerpret the indicial admittance by inspection. Curves 10 and 11, Fig. 7, are low-pass filter characteristics, the formerbeing a measured curve of a typical filter, while the latter is a calculatedcurve
. The Bell System technical journal . 2. NDICIAL RESPONSE Fig. 9—String oscillograph characteristics—frequency response and indicial response withdifferent amounts of damping. The curves 7, 8, and 9 show that when the low frequencies are absent, theindicial response becomxs too difficult to interpret. We must restrict ourmeasurements to systems which are ideal at the low frequencies in order tointerpret the indicial admittance by inspection. Curves 10 and 11, Fig. 7, are low-pass filter characteristics, the formerbeing a measured curve of a typical filter, while the latter is a calculatedcurve for an ideal filter. The two curves check reasonably well and indicatethe effect of a very sharp cutoff as compared to those of the receivers shown INDICIAL RESPONSE OF TELEPHONE RECEIVERS 147 above. This indicates the oscillatory nature of any system having a sharpcutoff at the upper frequencies. FREQUENCY RESPONSE OF TELEPHONE RECEIVERS2 I T lI n\ L-Ui I , f\ 1 -\ i \ J_ . Jl L ^ III 1 1 J _ _ _ A- _ _ IJJj ) rREflU
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