THE PAST FEW decades have seen remarkable progress in the design of integrated circuits for digital signal processing (DSP) for applications such as audio and video processing 1. A typical signal processing operation produces an output signal by filtering or transforming an input signal. Examples are smoothing a signal with a moving-average filter and performing a fast Fourier transform (FFT). We aim to apply and extend this expertise to the domain of molecular computation. Just as electronic systems implement computation in terms of voltage (energy per unit charge), molecular systems can compute in terms of molecular concentrations (molecules per unit volume). A variety of computational constructs have been proposed 2-5. Our prior work includes constructs for logic, memory, and arithmetic 6, 7.
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