Figure 6: Channel identification in a SISO [Filter]-[Ideal IAF] circuit using multiple I/O pairs. (a) Input signals are bandlimited to 100 Hz. The order of the space . (b) Biased output of the filter in response to the stimulus . (c) The filter output in (b) is integrated by an ideal IAF neuron. (d) The neuron generated a total of 48 spikes in response to all 4 input signals. (e) The identified impulse response (red) is shown together with the original filter (dashed black) and its projection (blue). The MSE between and is −73.3 dB. (f)–(h) Fourier amplitude spectra of , and . Note that but . In other words, but .