As a result of the Confederate victory in the Peninsula Campaign
A. Britain and France committed to sending economic and military aid to the Confederacy.
B. Lincoln named Ulysses S. Grant as commander of the Union forces.
C. Lincoln delayed his issuance of the Emancipation Proclamation.
D. the Union turned to a strategy of total war.
E. Lincoln abandoned the war in the West.
Answer: D
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One problem with causal filters is that the response of the filter always lags the excitation. This problem cannot be eliminated if the filtering is done in real time but if the signal is recorded for later “off-line” filtering one simple way of eliminating the lag effect is to filter the signal, record the response and then filter that recorded response with the same filter but playing the signal back through the system backward. Suppose the filter is a single-pole filter with a frequency response of the form 
where 
is the cutoff frequency (half-power frequency) of the filter.
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