- 1 8 1 6 1 4 S 1 2 20 8 0 6 0 4 0 2 0 0 0 05 0 1 0 2 0 25 0 15 Time S This Plot Shows All Of The Data I E No Data Va 1 (38.58 KiB) Viewed 94 times
Laboratory 2, produces a pulse of 5 Volts and 0.1 ms duration at
each downward transition of the input signal. Why would you expect
input signals with frequencies above 10 kHz to be outside of the
linear range of the device?
b) You notice that, under some circumstances, the
frequency-to-voltage converter produces two 0.1 ms signals instead
of one. Will the output voltage, as measured by the
multimeter, be different with this double pulse, over the single
pulse? If so, how different will it be and why is it
different?
c) An experimenter notices a 60 Hz noise signal on her
signal that is five times larger than her signal value. She
decides to purchase a notch filter so that she can remove the
signal with an analog filter before the digitization.
However, after some work, she is able to reduce the noise to
slightly less than her signal amplitude. She now decides to
remove the 60 Hz noise after digitization, through a digital
filter. Why was the analog filter better in the first case,
and the digital filter more appropriate in the second case?
d) How does pre-whitening work, and why is it sometimes
useful to pre-whiten a signal prior to digitizing (or otherwise
recording) it?
1.8 1.6 1.4 s 1.2 20.8 0.6 0.4 0.2 0 0 0.05 0.1 0.2 0.25 0.15 Time (s) This plot shows all of the data. I.e., no data values are less than zero.