4. Active open-loop control
4.1 Optimum filtering
The electrical block diagram of a single-channel open-loop active control system is shown in figure 6. It takes into account the measurement noiseN r (ω ) and N e (ω ) (due to turbulence, for example) present on the reference and error microphones, as well as a feedback path between the secondary source and the reference microphone, characterized by its frequency response H f (ω ).
The signals X r (ω ) and X e (ω ) ≥ H p (ω )X r (ω ) correspond to the primary noise...
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Active open-loop control
Active closed-loop control
References
In Éditions Techniques de l'Ingénieur
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