Test Before Class: Digital Signal Processing

Family_name Given_name (Example: NGETH Rithea)

Which process is not part of Analog-to-Digital Conversion process?

• Sampling
• Filtering
• Quantizing
• Coding

What is a spectrum of a signal?

• It is the values of a signal varying with time
• It is the values of a signal varying with frequency
• It is the values of a signal varying with phase
• It is the values of a signal varying with amplitude

What is the main process of filter?

• Increase the center frequency of a signal
• Extract the desired frequency component from a signal
• Decrease the center frequency of a signal
• Convert a continuous-time signal to discrete-time signal

What is the operation of a highpass filter?

• allow signal component with frequency higher than cut-off frequency to pass
• allow signal component with frequency lower than cut-off frequency to pass
• allow signal component with frequency between two cut-off frequencies to pass
• disallow signal component with frequency between two cut-off frequencies to pass

What is kind of the frequency response of the Butterworth filter?

• there is no ripple on passband and stopband.
• there is ripple on passband but no ripple on stopband.
• there is ripple on stopband but no ripple on passband.
• there is ripple on both passband and stopband.

Which operation convert a continuous-time signal to discrete-time signal?

• sampling
• filtering
• quantizing
• coding

A system with input-output relationship: y(t)=x(t-2). Which property is not correct for this system?

• static
• invertible
• causal
• stable

A system with input-output relationship: y(t)=tx(t). Which property is not correct for this system?

• time-invariant
• static
• linear
• causal

In order to increase the accuracy of analogy-to-digital conversion, which operation should not be done?

• increase the number of bits of ADC
• increase the sampling rate
• increase the sampling time
• decrease the sampling time