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Signal Processing > Terms > Flashcards

Terms Flashcards

1
Q

Any physical quantity that varies with time, space, or any other independent variable/s.

A

Signal

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2
Q

A pattern of variations of a physical quantity that can be manipulated, stored, or transmitted by a physical process.

A

Signal

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3
Q

An information variable represented by a physical quantity. (For digital systems, the variable takes on discrete values.)

A

Signal

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4
Q

A physical device that performs an operation on a signal.

A

System

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5
Q

Deals with the enhancement, extraction, and representation of information for communication or analysis.

A

Signal Processing

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6
Q

A field of numerical mathematics that is concerned with the processing of discrete signals.

A

Digital Signal Processing

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7
Q

This area of mathematics deals with the principles that underlie all digital systems.

A

Digital Signal Processing

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8
Q

Multichannel and Multidimensional Signals vs Single Chanel

A

MC: stereos, TV audios
MD: earthquake (depth, coverage)

Single: combined into one

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9
Q

Continuous-Time vs Discrete-Time

A

Continuous: present anywhere
Discrete: specific signal at a particular parameter

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10
Q

Discrete-Valued vs Continuous-Valued

A

Discrete: value of peak at that instant of time
Continuous: target range of operation at a given parameter

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11
Q

Random vs Deterministic

A

Random: present anywhere, anytime, aka stochastic signal
Deterministic: specific range, corresponding interpretation

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12
Q

Conversion of continuous-time signal into a discrete-time signal obtained by taking samples of CT signals at DT instants

A

Sampling

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13
Q

Conversion of DT continuous-valued signal into a DT, discrete-valued (digital) signal.

A

Quantization

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14
Q

Difference between the unquantized sample x(n) and the quantized output x_q(n)

A

Quantization Error

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15
Q

Each discrete value x_q(n) is represented by a b-bit binary sequence

A

Coding

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16
Q

The time interval T between successive samples

A

Sampling period o sample interval

17
Q

Reciprocal of time interval T = 1/T = Fs

A

Sampling rate (samples/second) or sampling frequency (Hz)

18
Q

Two conditions must be met under the Sampling Theorem.

A

The signal x(t) must be bandlimited, and the sampling rate fs must be chosen to be at least twice the maximum frequency fmax.

19
Q

Converts a binary digital number into an analog representation, such as voltage or current.

A

DAC

20
Q

Smallest observable change in the analog output that can be effected by a single step change in the digital input.

A

Resolution

21
Q

A measurement of the maximum speed at which the DAC’s
circuitry can operate and still produce the correct output.

A

Sampling Rate

22
Q

Determined by the time it takes to perform the
conversion process.

A

Conversion Speed

23
Q

Interval between a command to update (change) its output value and the instant it reaches its final value, within a specified percentage.

A

Settling Time

24
Q

Specifies the accuracy.

A

Linearity

25
Q

The degree to which each output step (or code width) varies from the ideal step, which is generally more critical when outputting small signals.

A

Differential Nonlinearity

26
Q

Measures the deviation of the entire transfer function from the ideal function and is generally more critical for outputting large signals.

A

Integral nonlinearity

27
Q

Minimum rate at which a signal can be sampled without introducing errors, which is twice the highest frequency present in the signal.

A

Nyquist frequency

28
Q

An effect that makes different signals indistinguishable when sampled.

A

Aliasing

29
Q

It also refers to the difference between a signal reconstructed from samples and the original continuous signal, when the resolution is too low.

A

Aliasing

30
Q

Aliasing depends on…

A

the sampling rate and frequency content of the signal.

31
Q

Passes all the appropriate input frequencies and cuts off all the undesired frequencies.

A

Anti-Aliasing Filters

32
Q

Something that conveys information, represented mathematically as functions of one or more independent variables.

A

Signal

33
Q

The output y[n] at every value of n depends only on the input x[n] at the same value of n.

A

Memoryless System

34
Q

A system is _____ if, for every choice of N0 the output sequence value at the index n = n0 depends only on the input sequence value for n≤n0.

A

Causal

35
Q

Representation of general sequence as a linear combination of delayed impulse

A

Convolution

Signal Processing (1 decks)

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