The two strategies are compared based on the level of attenuation of the global error sound power, the attenuation per total control force, and attenuation per actuator (in a structural-acoustic situation).
This work examines the active attenuation of the global error, sound power, from the point of view of two sensing/control strategies that seek to be generalised; thus are applicable to a wide range of applications and are independent of knowledge of structural dynamics.
And Geoff Emerick, a recording engineer for the Beatles, said: "Often when we were recording some of those Beatles rhythm tracks, there might be an error incorporated, and you would say, 'That error sounds rather good,' and we would actually elaborate on that.
The error of sound pressure response level in cabin throughout the spectrum is less than 3 dB.
Some registers will beep or emit an error sound if keys are pressed in the wrong order or wrong combination.
Suddenly I was a lot more sympathetic to the error; it sounds like Ms. Foley was in a state of whiplash at book-deadline time.
Plus, the off-kilter, wonky beats and static-laden "error" sounds don't quite seem to match their lyrical enthusiasm.
Cynically, I began to regard my reproductive system as a fussy vending machine, and trial and error sounded a whole lot like standing in front of it and putting in quarter after quarter and shaking it to try to jar loose the thing that I wanted.
