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But for t ^ 0, (SNR)c = BT/n. Another SNR, (SNR)t, was found to be

(SNR)t - Nt ^/VARjx+} = NbTb2 Pxy (t)/[oy(1 - pxy(t))] 8.2-38

where T is the total observation time over which spikes are processed, and pxy(T) is defined as the standardized cross-correlation function, given by

Pxy(t) = Rxy(t)/(oxOy) = ^(2B/rai) [sin(BT)/(Bx)]cos(ffl0t) 8.2-39

i for the IBPF. Wu goes on to define a "noise figure," F, for TC applied to the IBPF.

At t = 0, the noise figure reduces to

2G2lo(. - 2B) r 2 . 2 F = 2 I, '2 w exp[b2V4G\B] 8.2-4l n by (12Q2 +1)/6

As a performance index, F is desired to approach unity. Thus, the TC process gives the best results when the IBPF Q is large. Interestingly, too large a noise bandwidth, rai, works against one in making F large. However, rai must be large enough so that the estimate of Rxy(x) is a valid representation of h(x), the linear system weighting function. Common sense dictates that, in any case, rai must be > (rao + B).

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