Noise-aided processing : Revisiting dithering in a Σ ∆ quantizer

Stochastic resonance can be seen as a phenomenon where a nonlinear system is able to make an input signal cooperatively interact with an input noise. In this paper we show that a particular Σ∆ quantizer, which is a strongly nonlinear dynamical system, can provide stochastic resonance effects. In particular we will show that quantizing a sine, adding a small amount of noise in the input, can improve the quantization process. In particular, the output local signal-to-noise ratio exhibits a maximum when plotted against the noise amplitude.

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