Introduction To Digital Signal Processing

Question 1

Definition of signal

Answer 1

Any physical quantity that varies with any independent variable/s. Can also be defined as a function of one or more independent variables.

Question 2

3 examples of complex relationship of dependent and independent variables of signal.

Answer 2

1. Electrocardiogram
2. Electroencephalogram
3. Speech signal

Question 3

Definition of system

Answer 3

Any physical device that performs an operation on a signal.

Question 4

4 Advantages of Digital Signal Processing

Answer 4

1. Cheaper
2. Greater reliability
3. More flexibility
4. High accuracy and precision

Question 5

Systems are implemented through what?

Answer 5

Hardware and software or physical circuitry and programming

Question 6

What is signal processing?

Answer 6

Signal processing is the operation performed by the system to the signal. Can also be defined as the extraction of information to make it desirable.

Question 7

What is an algorithm?

Answer 7

An algorithm is a method or set of rules (mathematical operations) for implementing the system.

Question 8

3 major efforts done by DSP

Answer 8

1. filtering
2. correlation
3. spectral analysis

Question 9

Block diagram of an analog signal processing system

Answer 9

Analog input signal - Analog signal processor - Analog output signal

Question 10

Signals are functions of ________.

Answer 10

continuous variables

Question 11

Analog signals can be analyzed and processed through _______________ by using __________ or ________.

Answer 11

analog means
analog circuitry
processors

Question 12

Examples of system

Answer 12

Communication system
Control system
Remote sensing system
Biomedical system
Auditory system

Question 13

DSP applications that doesn’t need digital-to-analog converter

Answer 13

data acquisition, digital information display, speech recognition, data encoding

Question 14

Interface between the analog signal and digital processor

Answer 14

Analog-to-digital converter

Question 15

Why does in some cases digital-to-analog converter is not needed?

Answer 15

DAC is not needed when the information in the output will be given to user in digital form.

Question 16

What is a digital signal processor?

Answer 16

May be a large programmable digital computer or a small microprocessor. May also be a hardwired digital processor.

Question 16

Interface from the digital domain to the analog domain

Answer 16

Digital-to-analog converter

Question 18

Segment of speech several sinusoids

Answer 18

Amplitude, frequency, phase

Question 19

A small signal is considered to be any detectable value of _______, _______, or ________.

Answer 19

voltage, current, or charge.

Question 19

A signal should convey information about the ________ or ________ of a _______ ________.

Answer 19

state or behavior of a physical system.

Question 20

A signal varies ________, ________, or of two independent variables of x and y.

Answer 20

linearly, quadratically, or of two independent variables of x and y.

Question 21

Define analog signal

Answer 21

Is a signal that is defined over continuous range of time and amplitudes.

Question 23

DSP applications that doesn’t need analog-to-digital converter

Answer 23

CD players, text-to-speech synthesis, digital tone generators

Question 25

In a sine wave of analog signal, what is the x-axis and y-axis?

Answer 25

x-axis = time
y-axis = amplitude

Question 26

Alternative method for processing analog signals

Answer 26

Digital signal processing

Question 26

Digital signal is a signal that defined only at what?

Answer 26

Digital signal is a signal that is defined only at discrete values of amplitude or it is quantized at discrete values.

Question 27

Digital signal is a binary-weighted sum of signals, this means that the amplitude have how many defined values?

Answer 27

2 (two)

Question 28

Block diagram of digital signal processing system

Answer 28

Analog input signal - A/D converter - (digital input signal) - digital signal processor - (digital output signal) - D/A converter - analog output signal