A signal reproduction apparatus configured to reproduce, from an input signal (R) containing a weak signal (S) which is a piece of transmission information and noise (W) superimposed thereon, the weak signal through use of a stochastic resonance phenomenon, said signal reproduction apparatus comprising: at least one nonlinear element (NL, NL 1 ...NL N , NLD 1 ...NLD N ), with a nonlinear operation characteristic, which is configured to generate and output a nonlinear output signal (NLO, NLO 1 ...NLO N , DS 1 ...DS N ) based on an input of the at least one nonlinear element; N branch lines which are configured to split at least one of the input signal (R) and the nonlinear output signal to N split signals, with N being a natural number equal to or greater than 2, the at least one nonlinear element being configured to receive the input signal (R) or one split signal of the N split signals; N delay elements (D 1 ...D N , NLD 1 ...NLD N ), each one of the N delay elements arranged in a respective different one of the N branch lines and each one of the N delay elements connected with the at least one nonlinear element in series, which are configured to respectively delay a respective input of each one of the N delay elements with respective different delay times (Δt 1 ...Δt N ) and to respectively output N delay signals (DS 1 ...DS N ); and a combiner which is configured to combine N processed signals, obtained at respective outputs of the N branch lines by passing them through the at least one nonlinear element and each one of the N delay elements, into a single delayed combined signal (DA), characterized in that a minimum delay time difference among differences between the respective different delay times of respective pairs of the N delay elements is greater than an autocorrelation time of the noise (W) superimposed on the weak signal (S), and a maximum delay time difference among the differences between the respective different delay times of the respective pairs of the N delay elements is equal to or less than 1/ , where f is a maximum frequency of the weak signal (S) to be reproduced. at least one nonlinear element (NL, NL 1 ...NL N , NLD 1 ...NLD N ), with a nonlinear operation characteristic, which is configured to generate and output a nonlinear output signal (NLO, NLO 1 ...NLO N , DS 1 ...DS N ) based on an input of the at least one nonlinear element; N branch lines which are configured to split at least one of the input signal (R) and the nonlinear output signal to N split signals, with N being a natural number equal to or greater than 2, the at least one nonlinear element being configured to receive the input signal (R) or one split signal of the N split signals; N delay elements (D 1 ...D N , NLD 1 ...NLD N ), each one of the N delay elements arranged in a respective different one of the N branch lines and each one of the N delay elements connected with the at least one nonlinear element in series, which are configured to respectively delay a respective input of each one of the N delay elements with respective different delay times (Δt 1 ...Δt N ) and to respectively output N delay signals (DS 1 ...DS N ); and a combiner which is configured to combine N processed signals, obtained at respective outputs of the N branch lines by passing them through the at least one nonlinear element and each one of the N delay elements, into a single delayed combined signal (DA), characterized in that a minimum delay time difference among differences between the respective different delay times of respective pairs of the N delay elements is greater than an autocorrelation time of the noise (W) superimposed on the weak signal (S), and a maximum delay time difference among the differences between the respective different delay times of the respective pairs of the N delay elements is equal to or less than 1/ , where f is a maximum frequency of the weak signal (S) to be reproduced. <EOS>