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Overall Noise Analysis

Overall system noise was ``budgeted.'' It was understood that each component in the audio path contributed to end-to-end system noise. Care was taken to choose components with low noise specs, and use those components such that the noise specifications were met. Where possible, PSpice simulations were carried out to get a feel for the noise behavior of small subsystems. There are two known noise problems with the prototype. There is a -50dB noise floor inherent in the system. Due to time constraints, no real investigation of the source of this noise was possible, though some theories have been proposed. In addition to this noise floor, digital ``hash'' from the internal microcontroller is being picked up by the system. This will likely be remedied with some shielding and more supply bypassing.

Steve Richardson 2000-07-06
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