The Michigan Daily - Wednesday, November 15, 2000 - 5

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A noise-reducing headset us
phone in the earcup to redu
The problem:
When the earcup is clamped
speaker is driving into a high
earcup is small compared to
lengths, but large comparec
lengths. So the impedance v
driver varies substantially in
control system must comper
a tough problem in itself.

In

head ar
fer func

6;

parameters, inc

SI

The challenge:
Design a high-bandwidth, high-gain cc
stable even when the resonances vary

TT