This lecture provides an introduction to digital signal processing. It defines what a signal is and discusses different types of signals including analog, discrete-time, and digital signals. It also covers signal classifications such as deterministic vs random, stationary vs non-stationary, and finite vs infinite length signals. The lecture then discusses analog signal processing systems and digital signal processing systems as well as transformations between time and frequency domains. It provides an overview of pros and cons of analog vs digital signal processing and examples of applications of digital signal processing.
Digital: Operating by the use of discrete signals to represent data in the form of numbers.
Signal: A parameter (Electrical quantity or effect) that can be varied in such a way as to convey information.
Processing: A series operations performed according to programmed instructions.
Digital: Operating by the use of discrete signals to represent data in the form of numbers.
Signal: A parameter (Electrical quantity or effect) that can be varied in such a way as to convey information.
Processing: A series operations performed according to programmed instructions.
COntents:
Signals & Systems, Classification of Continuous and Discrete Time signals, Standard Continuous and Discrete Time Signals
Block Diagram Representation of System, Properties of System
Linear Time Invariant Systems (LTI)
Convolution, Properties of Convolution, Performing Convolution
Differential and Difference Equation Representation of LTI Systems
Fourier Series, Dirichlit Condition, Determination of Fourier Coefficeints, Wave Symmetry, Exponential Form of Fourier Series
Fourier Transform, Discrete Time Fourier Transform
Laplace Transform, Inverse Laplace Transform, Properties of Laplace Transform
Z-Transform, Properties of Z-Transform, Inverse Z- Transform
Text Book
Signal & Systems (2nd Edition) By A. V. Oppenheim, A. S. Willsky & S. H. Nawa
Signal & Systems
By Prentice Hall
Reference Book
Signal & Systems (2nd Edition)
By S. Haykin & B.V. Veen
Signals & Systems
By Smarajit Gosh
DSP- use of digital processing, such as by computers or more specialized digital signal processors,to perform a wide variety of signal processing operations.
Signal and System, CT Signal DT Signal, Signal Processing(amplitude and time ...Waqas Afzal
Signal and System(definitions)
Continuous-Time Signal
Discrete-Time Signal
Signal Processing
Basic Elements of Signal Processing
Classification of Signals
Basic Signal Operations(amplitude and time scaling)
Classification of signals and systems as well as their properties are given in the PPT .Examples related to types of signals and systems are also given .
link of a reference: http://www.slideshare.net/zena_mohammed/advanced-digital-signal-processing-book. digital_signal_processing__a_practical_approach. this reference for asked me for pictures in presentation of Multirate Digital Signal Processing.
The presentation covers sampling theorem, ideal sampling, flat top sampling, natural sampling, reconstruction of signals from samples, aliasing effect, zero order hold, upsampling, downsampling, and discrete time processing of continuous time signals.
Digital signal processing is a specialized microprocessor with its architecture optimized for operational needs of digital signal processing
Application's of DSP like STFT and Wavelet transform has been explained in detail with images.
COntents:
Signals & Systems, Classification of Continuous and Discrete Time signals, Standard Continuous and Discrete Time Signals
Block Diagram Representation of System, Properties of System
Linear Time Invariant Systems (LTI)
Convolution, Properties of Convolution, Performing Convolution
Differential and Difference Equation Representation of LTI Systems
Fourier Series, Dirichlit Condition, Determination of Fourier Coefficeints, Wave Symmetry, Exponential Form of Fourier Series
Fourier Transform, Discrete Time Fourier Transform
Laplace Transform, Inverse Laplace Transform, Properties of Laplace Transform
Z-Transform, Properties of Z-Transform, Inverse Z- Transform
Text Book
Signal & Systems (2nd Edition) By A. V. Oppenheim, A. S. Willsky & S. H. Nawa
Signal & Systems
By Prentice Hall
Reference Book
Signal & Systems (2nd Edition)
By S. Haykin & B.V. Veen
Signals & Systems
By Smarajit Gosh
DSP- use of digital processing, such as by computers or more specialized digital signal processors,to perform a wide variety of signal processing operations.
Signal and System, CT Signal DT Signal, Signal Processing(amplitude and time ...Waqas Afzal
Signal and System(definitions)
Continuous-Time Signal
Discrete-Time Signal
Signal Processing
Basic Elements of Signal Processing
Classification of Signals
Basic Signal Operations(amplitude and time scaling)
Classification of signals and systems as well as their properties are given in the PPT .Examples related to types of signals and systems are also given .
link of a reference: http://www.slideshare.net/zena_mohammed/advanced-digital-signal-processing-book. digital_signal_processing__a_practical_approach. this reference for asked me for pictures in presentation of Multirate Digital Signal Processing.
The presentation covers sampling theorem, ideal sampling, flat top sampling, natural sampling, reconstruction of signals from samples, aliasing effect, zero order hold, upsampling, downsampling, and discrete time processing of continuous time signals.
Digital signal processing is a specialized microprocessor with its architecture optimized for operational needs of digital signal processing
Application's of DSP like STFT and Wavelet transform has been explained in detail with images.
Signals and Systems
What is a signal?
Signal Basics
Analog / Digital Signals
Real vs Complex
Periodic vs. Aperiodic
Bounded vs. Unbounded
Causal vs. Noncausal
Even vs. Odd
Power vs. Energy
The signal encapsulates information about the behaviour of a physical phenomenon, for example, electrical current flowing through a resistor, sonar sound waves propagating under water, or earthquakes
The signal encapsulates information about the behaviour of a physical phenomenon, for example, electrical current flowing through a resistor, sonar sound waves propagating under water, or earthquakes.
For ease of analog or digital information transmission and reception, modulation is the foremost important technique. In the present project, we’ll discuss about different modulation scheme in digital mode done by operating a switch/ key by the digital data. As we know, by modifying basic three parameters of the carrier signal, three basic modulation schemes can be obtained; generation and detection of these three modulations are discussed and compared with respect to probability of error or bit error rate (BER).
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
DSP_2018_FOEHU - Lec 1 - Introduction to Digital Signal Processing
1. LECTURE (1)
Introduction to Digital Signal Processing
رَـدْقِـن،،،لمااننا نصدقْْقِنرَد
Amr E. Mohamed
Faculty of Engineering - Helwan University
2. Introduction
Objectives:
what is a signal
What is Signal Processing
• Analog Signal Processing System
• Digital Signal Processing System
Time and Frequency Domain Representations of Signals
Brief introduction to MATLAB.
2
3. Fundamentals of Signals
Signal (flow of information):
Generally convey information about the state or behavior of a physical phenomena.
Measured quantity that varies with time (or position)
Electrical signal received from a transducer (Microphone, Thermometer,
Accelerometer, Antenna, etc.)
Electrical signal that controls a process
Signal:
Signal is defined as any physical quantity that varies with Time, Space, or any other
independent variables. For Example, the functions
Example:
𝑠1(𝑡) = 5𝑡 or 𝑠1(𝑡) = 5𝑡2 one variable
𝑆(𝑥, 𝑦) = 3𝑥 + 4𝑥𝑦 + 6𝑥2
two variables x and y
3
4. Overview of Signal Processing: Signal Classifications
4
Fig. 1.1 Signal Classifications
Signal is a representation of physical quantity or phenomenon
Deterministic Signals Random Signals
Time Domain Representation
t is the independent variable
Frequency Domain Representation
f is the independent variable
Representation
Continuous
Discrete
Continuous
Discrete
5. Continuous-Time versus Discrete-Time Signals
1) Continuous-Time signal or analog signal: are defined for every value
of time and they take on values in the continuous interval (a,b).
Analog Signal
Continuous in time.
Amplitude may take on any value in the continuous range of (-∞, ∞).
Analog Processing
Differentiation, Integration, Filtering, Amplification.
Differential Equations
Implemented via passive or active electronic circuitry.
5
6. Continuous-Time versus Discrete-Time Signals
2) Discrete-Time signals: are defined only at certain specific value of
time.
Continuous in Amplitude but Discrete in Time
Only defined for certain time instances.
Can be obtained from analog signals via sampling.
6
7. 3) Digital Signal: is the signal that takes on values from a finite set of
possible values.
Discrete in Amplitude & Discrete in Time.
Can be obtained from Discrete signals via quantization.
7
Continuous-Time versus Discrete-Time Signals
8. Sampling Process
Discrete-time signals are often generated from corresponding continuous-time
signals through the use of an analog-to-digital (A/D) interface. An A/D
interface typically comprises three components, namely, a sampler, a
quantizer, and an encoder as depicted in Fig. 1.3(a).
Similarly, continuous-time signals can be obtained by using a digital-to-analog
(D/A) interface. The D/A interface comprises two modules, a decoder and a
smoothing device as depicted in Fig. 1.3(b).
8Fig. 1.3 Sampling system: (a) A/D interface, (b) D/A interface.
(SNR) dB= 6.02 n + 4.77
9. Deterministic versus Random Signals
1) Deterministic Signal: Any signal whose past,
present and future values are precisely
known without any uncertainty.
2) Random Signal: A signal in which cannot be
approximated by a formula to a reasonable
degree of accuracy (i.e. noise).
The ‘shhhh’ sound is a good example that is
rather easy to observe using a microphone
and oscilloscope.
Random signals are characterized by
analyzing the statistical characteristics
across an ensemble of records.
9
10. Transient Signals
Transient signals may be defined as signals that exist for a finite range
of time as shown in the figure. Typical examples are hammer excitation
of systems explosion and shock loading etc.
10
11. Stationary versus Nonstationary Signals
Stationary signals are those whose average properties do not change
with time Stationary signals have constant parameters to change with
time.
Nonstationary signals have time dependent parameters. In an engine
excited vibration where the engines speed varies with time; the
fundamental period changes with time as well as with the corresponding
dynamic loads that cause vibration.
11
12. Finite and infinite length
1. Finite-length signal: nonzero over a finite interval tmin< t< tmax
2. Infinite-length signal: nonzero over all real numbers
12
13. Multi-channel & Multidimensional Signals
A signal is described by a function of one or more independent
variables. The value of function can be real-valued Scalar, a complex-
valued, or perhaps a vector.
Real-Valued Signal
Complex-Valued Signal
Vector Signal
tAts 3sin)(1
tjtAAets tj
3sin3cos)( 3
2
)(
)(
)(
)(
3
2
1
3
ts
ts
ts
tS
13
14. Multi-channel & Multidimensional Signals
1) Multi-channel Signals
Signals are generated by multiple source or multiple sensor. This signals, can
represented in vector form.
Example: ECG (Electrocardiogram) are often used 3-channel and 12-
channel.
14
15. Multi-channel & Multidimensional Signals
2) Multidimensional Signals:
If the signal is a function of a single independent variable, the signal called a
one-dimensional signal.
On the other hand , a signal called M-dimensional if its value is a function of M
independent variables.
The gray picture is an example of a 2-dimensional signal, the brightness or the
intensity I(x,y) at each point is a function of 2 independent variables.
The black & white TV picture [I(x,y,t)]: is a “3-Dimensional” since the
brightness is a function of time.
The color TV picture: is a multi-channel/multidimensional signal.
),,(
),,(
),,(
),,(
tyxI
tyxI
tyxI
tyxI
b
g
r
15
17. What is Signal Processing
Signals may have to be transformed in order to
Amplify or filter out embedded information
Detect patterns
Prepare the signal to survive a transmission channel
Undo distortions contributed by a transmission channel
Compensate for sensor deficiencies
Find information encoded in a different domain.
To do so, we also need:
Methods to measure, characterize, model, and simulate signals.
Mathematical tools that split common channels and transformations into easily
manipulated building blocks.
17
19. Analog Signal Processing
ℎ(𝑡): The System Impulse Response
𝐻(𝑠): The System Transfer Function
𝐻(Ω): The System Frequency Response
Analogue signal processing is achieved by using analogue components
such as:
Resistors.
Capacitors.
Inductors.
)(tx
)(sX
)(*)()( txthty
)(.)()( sXsHsY
Analog
input
Signal
Analog
output
Signal
Analog
Signal
Processor
19
)(X )(.)()( XHY
20. Limitations of Analog Signal Processing
Accuracy limitations due to
Component tolerances
Undesired nonlinearities
Limited repeatability due to
Tolerances
Changes in environmental conditions
• Temperature
• Vibration
Sensitivity to electrical noise
Limited dynamic range for voltage and currents
Inflexibility to changes
Difficulty of implementing certain operations
Nonlinear operations
Time-varying operations
Difficulty of storing information
20
21. Digital Signal Processing
ℎ(𝑛): The System Impulse Response (Weighted Sequence)
𝐻(𝑧): The System Transfer Function
𝐻 𝑝𝑓(𝑠) : Prefilter (Band-limited – Reduce noise)
𝐻𝑟𝑐(𝑠) : reconstruction filter (smoothing)
Analog/digital and digital/analog converters, CPU, DSP, ASIC, FPGA
Digital signal processing techniques are now so powerful that sometimes it is extremely
difficult, if not impossible, for analogue signal processing to achieve similar
performance.
Examples:
FIR filter with linear phase.
Adaptive filters.
)(nx
)(zX
)(*)()(ˆ nxnhnx
)(.)()(ˆ zXzHzX
)(sH pf )(sHrc
)(tx
)(sX
)(ˆ tx
)(ˆ sX
Digital
Signal
Processor
ADC DAC
21
22. Pros and Cons of Digital Signal Processing
Pros
It is easy to Change, Correct, or Update applications (software changes).
Accuracy can be controlled by choosing word length
Repeatable
Sensitivity to electrical noise is minimal
Dynamic range can be controlled using floating point numbers
Flexibility can be achieved with software implementations
Non-linear and time-varying operations are easier to implement
Digital storage is cheap
Digital information can be encrypted for security
Small size.
Development time.
Power consumption.
Cost, cheaper than analog.
22
23. Pros and Cons of Digital Signal Processing
Cons
Sampling causes loss of information
A/D and D/A requires mixed-signal hardware
Limited speed of processors
Quantization and round-off errors
Discrete time processing artifacts (aliasing, delay)
Dan require significantly more power (battery, cooling)
Digital clock and switching (Synchronization)
23
24. Signal Processing
Humans are the most advanced signal processors
speech and pattern recognition, speech synthesis,…
We encounter many types of signals in various applications
Electrical signals: voltage, current, magnetic and electric fields,…
Mechanical signals: velocity, force, displacement,…
Acoustic signals: sound, vibration,…
Other signals: pressure, temperature,…
Most real-world signals are analog
They are continuous in time and amplitude
Convert to voltage or currents using sensors and transducers
Analog circuits process these signals using
Resistors, Capacitors, Inductors, Amplifiers,…
Analog signal processing examples
Audio processing in FM radios
Video processing in traditional TV sets
24
25. DSP is Everywhere
Sound applications
Compression, enhancement, special effects, synthesis, recognition, echo cancellation,…
Cell Phones, MP3 Players, Movies, Dictation, Text-to-speech,…
Communication
Modulation, coding, detection, equalization, echo cancellation,…
Cell Phones, dial-up modem, DSL modem, Satellite Receiver,…
Automotive
ABS, GPS, Active Noise Cancellation, Cruise Control, Parking,…
Medical
Magnetic Resonance, Tomography, Electrocardiogram,…
Military
Radar, Sonar, Space photographs, remote sensing,…
Image and Video Applications
DVD, JPEG, Movie special effects, video conferencing,…
Mechanical
Motor control, process control, oil and mineral prospecting,…
25
26. Time and Frequency Domain Representations of Signals
Signals have so far been represented in terms of functions of time, i.e., x(t) or x(nT). In
many situations, it is useful to represent signals in terms of functions of frequency using
Fourier transform or Fourier series.
For example, a continuous-time periodic signal made up of a sum of sinusoidal
components such as:
can be fully described by two sets, say:
And
that describe the amplitudes and phase angles of the sinusoidal components present in
the signal. Sets A() and () can be referred to as the amplitude spectrum and phase
spectrum of the signal, respectively, for obvious reasons, and can be represented by
tables or graphs that give the amplitude and phase angle associated with each frequency.
26
)sin()(
9
1
kk
k
k tAtx
9...,,2,1:)( kforAA kk
9...,,2,1:)( kforkk
27. Time and Frequency Domain Representations of Signals (Cont…)
For example, if Ak and k in Eq. (1.1) assume the numerical values given
by Table 1.1, then x(t) can be represented in the time domain by the
graph in Fig. 1.7(a) and in the frequency domain by Table 1.1 or by the
graphs in Fig. 1.7(b) and (c).
27Fig. 1.7(a) Time-domain representation.Table 1.1 Parameters of signal in Eq. (1.1)
28. Time and Frequency Domain Representations of Signals
(Cont…)
28Fig. 1.7 (b) Amplitude spectrum, (c) Phase spectrum.
(b) (c)
29. Filtering Process
Filtering can be used to select one or more desirable and
simultaneously reject one or more undesirable bands of frequency
components, or simply frequencies. They include different types:
1. Lowpass filters select a band of preferred low frequencies and reject a
band of undesirable high frequencies from the frequencies present in
the signal depicted in Fig. 1.7, as illustrated in Fig. 1.8.
2. Highpass filters select a band of preferred high frequencies and reject
a band of undesirable low frequencies as illustrated in Fig. 1.9.
3. Bandpass filters select a band of frequencies and reject low and high
frequencies as illustrated in Fig. 1.10.
4. Bandstop filters to reject a band of frequencies but select low
frequencies and high frequencies as illustrated in Fig. 1.11.
29
30. Filtering Process: Lowpass Filter
30
Fig. 1.8(a) Lowpass filtering applied to the signal depicted in Fig. 1.7: (a) Time-domain
representation, (b) amplitude spectrum, (c) phase spectrum..
(b) (c)
(a)
31. Filtering Process: Highpass Filter
31
Fig. 1.9(a) Highpass filtering applied to the signal depicted in Fig. 1.3: (a) Time-domain
representation, (b) amplitude spectrum, (c) phase spectrum..
(b)
(c)
(a)
32. Filtering Process: Bandpass Filter
32
Fig. 1.10(a) Bandpass filtering applied to the signal depicted in Fig. 1.3: (a) Time-domain
representation, (b) amplitude spectrum, (c) phase spectrum..
(b) (c)
(a)
33. Filtering Process: Bandstop Filter
33
Fig. 1.11(a) Bandstop filtering applied to the signal depicted in Fig. 1.3: (a) Time-domain
representation, (b) amplitude spectrum, (c) phase spectrum..
(b) (c)
(a)