Figure 3
From: Head tracking extends local active control of broadband sound to higher frequencies
Time history of the pressure signal measured in the right-hand ear of the dummy head, (a) when in position B before control, up to 30 seconds, when control is implemented with the observation filter and plant responses appropriate for the nominal head position, from 30 to 60 seconds, and when the head tracker is enabled so that the correct head position is identified, after 60 seconds. The power spectral density of the signal at this microphone is also shown, (b) before control, after control but without head tracking and after control with the head tracker enabled.
