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. Author manuscript; available in PMC: 2020 May 20.
Published before final editing as: IEEE Trans Biomed Eng. 2018 Nov 20:10.1109/TBME.2018.2882337. doi: 10.1109/TBME.2018.2882337

Fig. 5.

Fig. 5

PAM and single channel controllers perform similarly, but the PAM controller is less susceptible to noise. (A) Measured levels of the third harmonic (H3) due to PAM (blue) and single channel (purple) controllers for the smooth control law for a representative run (note the single channel level has been shifted up by 6 dB for ease of comparison. (B) Applied pressure at each step. (C) Histogram of proximity of acoustic emission level of the third harmonic (H3) to target level for PAM and single channel controllers in terms of controller tolerance σ, and (D) applied pressures over all runs; vertical scale is 60 counts. (E) Level of H3 due to the smooth PAM controller and (G) single channel controller with the indicated SNR (− 6, 0, and 12 dB). (F) Histogram of proximity of H3 level to level for PAM and (H) single channel controller with indicated SNR; vertical scale is 12 counts.