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We report the occurrence of vibrational resonance (VR) and the underlyingmechanism in a simple piecewise linear electronic circuit, namely theMurali-Lakshmanan-Chua (MLC) circuit, driven by an additional biharmonic signalwith widely different frequency. When the amplitude of the high-frequency forceis tuned, the resultant vibrational resonance is used to detect thelow-frequency signal and also to enhance it into a high-frequency signal.Further, we also show that even when the low-frequency signal is changed fromsine wave to square and sawtooth waves, vibrational resonance can be used todetect and enhance them into high-frequency signals. These behaviors, confirmedby experimental results, are illustrated with appropriate analytical andnumerical solutions of the corresponding circuit equations describing thesystem. Finally, we also verify the signal detection in the above circuit evenwith the addition of noise.

Harnessing vibrational resonance to identify and enhance input signals