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Real-Time Contrast Enhancement to Improve Speech Recognition

Figure 1

Schematic of the contrast enhancement algorithm.

The incoming signal, x(t), is first decomposed into 110.25-Hz wide frequency channels using polyphase decomposition (see text). Intermediate processing incorporates a winner-take-all (WTA) strategy in which channel gain is weighted in a way that simulates a lateral inhibitory network and sharpens spectral contrast. The output signal, y(t), is synthesized by an inverse of the process used to analyze the signal.

Figure 1

doi: https://doi.org/10.1371/journal.pone.0024630.g001