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The benefits of using energy density as a cost function for active noise control systems are widely recognised. For this reason the AVC group at the University of Adelaide has been looking at various methods for estimating the energy density at a point in space using inexpensive components. This led to the design and manufacture of an analog energy density sensor.
During the early stages of the development of the analog Energy Density Sensor it was found that the signal conditioning unit (SCU) suffered from unacceptable phase and magnitude errors. The error was traced to poor quality components. Initially a modified analog system was proposed, using components with better tolerances. On costing the modified system it was found that the cost of a hybrid analog/digital system was similar to the cost of a wholly analog system, but the hybrid system also had the advantages of greater flexibility and accuracy. Subsequently a new unit was made using digital processing rather than analogue components.
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