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1. |
A signal x(t) = 100 cos (24p x 103t) is ideally sampled with a sampling period of 50 μ sec and then passed through an ideal low pass filter with cut off frequency of 15 kHz Which of the following frequencies are present at the filter output? |
A. | 12 kHz only |
B. | 8 kHz only |
C. | 12 kHz and 9 kHz |
D. | 12 kHz and 8 kHz |
Answer» E. | |