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Test your basic knowledge |
DSP: Digital Signal Processing
Start Test
Study First
Subject
:
it-skills
Instructions:
Answer 46 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form)
General amplitude modulation
Long range passive towed sonar
Sampling
Convolution
2. Imax-Imin /4*( 2^n - 1)
Aliasing
Quantization
Quantization error equation
Echo reduction
3. Occur frequently in nature - sound waves - electromagnetic radiation - any type of periodic waveform can be constructed from this signal
Echo Location
Fourier theory
General amplitude modulation
Sinusoidal Signals
4. DSP Applications: - radar and sonar - oil exploration - space exploration - _______
Naval DSP applications
Quantization error equation
Medical imaging
Normalized impulse
5. Uses a relatively low frequency message signal to modulate or vary the frequency of a relatively high frequency carrier signal
Sinusoidal Signals
DSP
General amplitude modulation
Frequency Modulation (FM signal processing)
6. Use only the current and past input samples to calculate the current output sample; -no feedback -non recursive filters
Normalized impulse
Finite Impulse Response (FIR) Filters
Beat Note
Time domain representation
7. Signal comprised of a continuous set of values; -not digital or discrete
Frequency Modulation (FM signal processing)
Sinusoidal Signals
Analog Signals
Continuous
8. Varying quantity that is a function of time; time is continuous - then the value of the signal can be found at any point in time; - not discrete
Digital
Quantization error equation
Continuous
Convolution
9. Used in medical fields - space - commercial imaging products
Sinusoidal Signals
Spectrum
Normalized impulse
Image processing
10. If an input is delayed (shifted) by n0 - then the output is delayed by the same amount
Even Functions
Odd Functions
Harmonic
Time Invariant Systems
11. Imax-Imin / 2^n - 1
Time domain representation
Frequency Modulation (FM signal processing)
Echo reduction
Resolution equation
12. Represented mathematically by an indexed sequence of numbers
Digital
Resolution equation
Discrete Time Signal
Continuous
13. Description of how one parameter is related to another - ex. voltage which varies with time is common in analog electronics
Frequency Modulation (FM signal processing)
Signal
Convolution
Aliasing
14. Waveform is symmetrical about the origin or f(x) = -f(-x); - Sine is this function - only sine terms and no constant term.
Negative frequency
Impulse Decomposition
Long range passive towed sonar
Odd Functions
15. Echo Location uses: radar - sonar - _______
Beat Note
Reflection seismology
Fourier Decomposition
Sampled Data Signal
16. Equivalent to the principle of superposition - if the input is the sum of two or more scaled sequences - we can find the output of each sequence acting alone - then add (superimpose) the separate scaled output
Half-Wave symmetry
Beat Note
Impulse Decomposition
Linear Systems
17. For any sinusoidal signal with fundamental frequency f 0 - there exists an infinite number of ________frequencies or frequencies which are integer multiples of f 0 .
Audio Processing
Echo reduction
Harmonic
Finite Impulse Response (FIR) Filters
18. A phenomenon of sinusoids changing frequency during sampling; sinusoid assumes a frequency other than its own
Finite Impulse Response (FIR) Filters
Beat Note
Aliasing
Spectrum
19. Involves music - speech generation - speech recognition
Audio Processing
Linearity
Resolution equation
Analog Signals
20. Used for detection and tracking of underwater acoustic signals - consists of a dry end and a wet end - dry end;
Convolution
Even Functions
Long range passive towed sonar
Fourier theory
21. The conversion of analog or continuous signals to digital or discrete signals - referred to as analog-to-digital conversion - value of signal is sampled at discrete time intervals; time intervals are usually uniform
Quantization error equation
Quantization
Fourier theory
Analog Signals
22. Controls how much the carrier frequency varies around its unmodulated value.
Time Invariant Systems
Audio Processing
Modulation index
Digital filters purposes
23. Filter output sample depends on previous input samples and previous filter output samples - these filters always have a feedback component - recursive filters
General amplitude modulation
Discrete Time Signal
DSP
Infinite Impulse Response (IIR) Filters
24. Uses a process called the Discrete Fourier Transform or DFT - used to determine the frequency content of a continuous signal
Beat Note
Even Functions
Fourier Decomposition
Linear Systems
25. Processing involves improving quality a signal- e.g. image enhancement - data compressions - noise reduction - ________ - filtering - etc.
Reflection seismology
Odd Functions
Half-Wave symmetry
Echo reduction
26. A formal mathematical operation - takes two signals and produces a third signal
Sinusoidal Signals
Convolution
Digital filters purposes
Impulse Decomposition
27. Uses a signal that has been quantized into discrete values rather than a continuous signal
Digital
Even Functions
Sinusoidal Signals
Beat Note
28. Graphical representation of the frequency content of a signal - allows us to quickly and easily see the relationship between different frequency components and their amplitudes
Negative frequency
Time Invariant Systems
DSP
Spectrum
29. States any periodic waveform can be approximated by a sum of harmonically related sinusoids
Fourier theory
Even Functions
Naval DSP applications
Rotating phasor
30. Used for two general purposes: (1) separation of signals that have been combined - and (2) restoration of signals that have been distorted in some way.
Time domain representation
Signal
Digital filters purposes
Harmonic
31. Processing of signals by digital means
DSP
Sampling
Medical imaging
Radar
32. Uses multiplexing - compressions - and echo control
Frequency Modulation (FM signal processing)
Telecommunication
Image processing
Aliasing
33. Two separate units - one for tracking targets - one for illumination of targets for weapons guidance (SAMs etc)
Radar
Aliasing
Continuous
General amplitude modulation
34. Industry Apps / Major Areas: Telecommunications - Audio Processing - ___________ - Image processing
Time Invariant Systems
Echo Location
Even Functions
Fourier theory
35. Radar - Sonar - Data Communication
Naval DSP applications
Linearity
Image processing
DSP
36. Type of decomposition relies on the use of a function known as the delta function or unit _____function
Impulse Decomposition
Linear Systems
Aliasing
Naval DSP applications
37. Refers to what we are familiar with as the signal itself - with amplitude values plotted against time values
Continuous
Time domain representation
Digital
Odd Functions
38. Waveform is symmetrical about the vertical axis or f(x) = f(-x); - Cosine is this function - only have cosine terms and may have a constant.
Even Functions
Odd Functions
Linear Systems
Rotating phasor
39. Obtained by recording the values of x(t) at equally spaced time instants - the result is a sequence of numbers whose individual values are samples of the analog signal
Linearity
Fourier theory
Quantization error equation
Sampled Data Signal
40. A projection onto real axis
Rotating phasor
Linearity
Audio Processing
Finite Impulse Response (FIR) Filters
41. A phasor rotating in negative (clockwise) direction
Quantization error equation
Medical imaging
Negative frequency
Long range passive towed sonar
42. The negative half cycle of the function waveform is the same shape as the positive half - except inverted - Both sine and cosine functions have this - Functions with this have only odd harmonics.
Half-Wave symmetry
General amplitude modulation
Resolution equation
Infinite Impulse Response (IIR) Filters
43. A special case of amplitude modulation - When two sinusoids of different frequencies are multiplied
Beat Note
DSP
Infinite Impulse Response (IIR) Filters
Fourier theory
44. Two properties lead to simplifications of mathematical analysis: - __________ - time-invariance
Sampled Data Signal
Digital
Linearity
Quantization error equation
45. Process of multiplying a (relatively) low frequency message signal by a high frequency sinusoid
Infinite Impulse Response (IIR) Filters
General amplitude modulation
Echo reduction
Even Functions
46. Means that sample number zero has a value of one - while all other samples have a value of zero -delta function is frequently called the unit impulse.
Echo reduction
Quantization error equation
Normalized impulse
Sinusoidal Signals