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1. The signal sampling implies :
The spectrum discretization | The spectrum periodization | The aliasing | The spectral leak |
2. The Nyquist-Shannon theorem states that the sampling frequency must be:
Equal to the maximum frequency within the signal | Twice the maximum frequency within the signal | 2.56 times the maximum frequency within the signal | 4 times the maximum frequency within the signal |
3. The slope of a filter is linked to :
The filter type | The quality factor of the filter | The cut-off frequency of the filter | The order of the filter |
4. The integration of a Dirac impulse is equal to :
1 | Infinite | 1/2 | 1.4114 |
5. The continuous Fourier Transform of a Dirac comb is :
A square function | A sinus cardinalis | A Dirac comb | A rectangle function |
6. A signal is causal if :
Its samples are null for t<0 | Its samples are due to a stochastic process | Its samples are due to a deterministic process | Its samples are null for t>0 |
7. During the digitalization step of a signal, the process which determines the signal magnitude is called:
The sampling | The quantification |
8. The central frequency of a sinusoidal signal with a 5ms period is:
100 Hz | 200 Hz | 500 Hz | 5000 Hz |
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