# Translations:Deconvolution: Einstein or predictive?/1/en

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Let us now address yet another deconvolution issue. In any such method discussed thus far, we always have assumed that the output signal is known. In general, deconvolution consists of two steps. The first step is to measure, estimate, or otherwise determine the input wavelet. The second step is to deconvolve the output signal by the input wavelet to yield the unit-impulse response. In predictive (spiking) deconvolution, the input wavelet is estimated from knowledge of the output signal. In signature deconvolution, the input wavelet (the signature) is measured directly.