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Loudspeaker

FIGURE 8.2-4 Instrumentation system used by Wu (1970) to compute the TC func tion, x + (t) . It was used on electronic bandpass filters as well as on the grasshopper's tympanal organ.

Analog readout V oc X+(T)

FIGURE 8.2-4 Instrumentation system used by Wu (1970) to compute the TC func tion, x + (t) . It was used on electronic bandpass filters as well as on the grasshopper's tympanal organ.

Figure 8.2-6C illustrates a cross-correlogram "gold standard," computed using the broadband noise input, x(t), and the bandpass filter output, y(t). A PAR model 100 signal correlator was used to compute Rxy(x). Figure 8.2-6A shows a noisy x+ (t) , computed by averaging NT = 2500 elicited spikes. The bandpass filter center frequency was at 1 kHz, and the noise spectrum cutoff was at 100 kHz. When t tk t tk

tk
FIGURE 8.2-5 Diagram showing how reverse playback of the analog tape allows averaging of the signal, x(-t), that led to the kth spike.

the noise bandwidth, f;, was reduced to 3.E3 Hz, the SNR of x+ (t) is slightly improved (see Figure 8.2-6B). Finally, with a 3-kHz fi, and 2500 spikes, the SNR

is better still. Clearly, x+(t) appears to estimate Rxy(x) with acceptable accuracy. (Data from Wu, 1970.)

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