题目内容

Which of the following statements about filter is not true?( )

An integrator can act as a filter.
B. The response of second order filter can be obtained by using inductance and capacitance.
C. Resistors, capacitors and amplifiers can form a second order filter.
D. Low pass filters gets the signal with higher frequency passed through.

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Which of the following is not the phase of Analog-to-digital conversion? ( )

Anti-aliasing filter
B. Sample and hold
C. Quantization
D. Zero-order hold

The complex frequency's real part helps describe a response to AC signals.

A. 对
B. 错

The length of the sampling interval is the same as the sampling frequency.

A. 对
B. 错

Most digital systems are combinational , that is they have states, and the outputs depend on the present state.

A. 对
B. 错