Signals, Spectra, and Signal Processing

Topic: Signals, Spectra, and Signal Processing

1.Which characteristic of a signal provides a measure of the extent of significant spectral content of the signal for positive frequencies?

Ans: bandwidth

2. A ______ is a frequency-selective device that is used to limit the spectrum of a signal to some specified band of frequencies

Ans: filter

3. Which is not a method of data compression?

Ans: Winzip

4. All of these are IIR Filter design techniques except

Ans: Frequency sampling

5. A ______ is a function that is defined for all time t contained in some interval on the real line

Ans: continuous-time (CT) signal

6. Convolution relates three signals: the input signal, the output signal, and the ______.

Ans: impulse response

7. What are the FIR Filter advantages?

• They can have exactly linear phase
• They are always stable
• Startup transients are finite in duration
• All of these  (Correct Answer)

8. A ______ is any process that produces an output signal in response to an input signal

Ans: system

9. ______ defines the distribution of energy or power per unit bandwidth as a function of frequency.

Ans: spectral density

10. An impulse signal in the time domain is represented as a _______ in the frequency domain

Ans: dc signal

11. This is a requirement for linearity

• homogeneity  
• additivity
• shift invariance
• all of these  (Correct Answer)

12. What are the IIR Filter advantages?

• Lower order for same specs  
• Lower group delay
• Less arithmetic involved
• All of these  (Correct Answer)

13. All of these are FIR Filter design techniques except:

• Windowing  
• Modeling of desired impulse response  (Correct Answer)
• Equiripple or Minimax Design
• Least squares

14. ______ is a compression standard for digital video sequences, such as used in computer video and digital television networks

Ans: MPEG

15. This Fourier Transform property states that if a function v(t) is shifted in the positive direction by an amount t0, the effect is equivalent to multiplying its Fourier transform V(f) by the factor exp(-j2 * pi * ft0).

Ans: Time shifting