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Re: Playing the devil's advocate

As with all servo systems, the circuit reacts to the difference between where the cone is (I think that's were Velodyne mounts its sensor, on the cone but it's been a long time since I've read their product literature and their design may have changed or I may have forgotten) and where it is supposed to be. Pressure applied to the cone such as a blast of air from a door closing will cause it to be displaced. So does the back pressure reflected off a hand held near the cone while it is moving. In this case the sensor output will register an error in cone position and the circuit will try to correct for it. This is not the same as correcting for room response, the same effect will take place in any room including an anechoic chamber. When properly designed and adjusted, it will not over compensate. (This is one of the likely causes of poor performance in feedback amplifiesr, the forward gain circuit not reacting (slewing) as quickly as the reverse gain circuit and therefore resulting in an overcorrection signal and error.) BTW, the critical mechanism which positions read write heads for disc drives works on this same principle. Servo control is the bedrock of virtually all modern control systems design and is applied in every industry.

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