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Figure 5: Channel identification in a SISO [Filter]-[Ideal IAF] circuit using a single I/O pair. (a) An input signal is bandlimited to 25 Hz. The order of the space is . (b) The corresponding biased output of the filter . (c) The filter output in (b) is integrated by the ideal IAF neuron. Whenever the membrane potential reaches a threshold , a spike is produced by the neuron and the potential is reset to . (d) The neuron generated a total of spikes. (e) The identified impulse response of the filter (red) is shown together with the original filter (dashed black) and its projection (blue). The MSE between and is dB. (f)–(h) Fourier amplitude spectra of , and . Note that but . In other words, but .