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Real-Time Contrast Enhancement to Improve Speech Recognition

Figure 2

Simulated input to the WTA network.

(a) Unenhanced spatiotemporal signal. (b) WTA enhanced spatiotemporal signal demonstrating spectral sharpening and expansion of the position of the spectral peaks as a consequence of dynamic competition between subband channels. (c) Cross-section of channels at 150 ms for unenhanced signals (blue), dynamically enhanced (red), and instantaneously enhanced (black) spatiotemporal signals illustrating spatial (spectral) sharpening. (d) Cross-section of channels at 370 ms for unenhanced (blue), dynamically enhanced (red), and instantaneously enhanced (black) spatiotemporal signals illustrating sharpening and expansion of spectral peaks.

Figure 2

doi: https://doi.org/10.1371/journal.pone.0024630.g002