The document discusses sampling theory and its applications. It introduces key concepts such as:
1. Signals can be represented by discrete sample values taken at regular intervals, and reconstructed using an ideal low-pass filter, as described by the sampling theorem.
2. The sampling theorem states that a band-limited signal with no frequencies above B Hz can be uniquely determined by samples taken at least every 1/(2B) seconds.
3. Anti-aliasing filters are used to limit the bandwidth of signals before sampling to avoid aliasing when the sampling rate is lower than predicted by the sampling theorem.
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.
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)
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.
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)
Sampling is a Simple method to convert analog signal into discrete Signal by using any one of its three methods
if the sampling frequency is twice or greater than twice then sampled signal can be convert back into analog signal easily......
A signal is a pattern of variation that carry information.
Signals are represented mathematically as a function of one or more independent variable
basic concept of signals
types of signals
system concepts
A wave analyzer is an instrument designed to measure relative amplitudes of single frequency components in a complex waveform. Basically, a wave instrument acts as a frequency selective voltmeter which is tuned to the frequency of one signal while rejecting all other signal components.
Sampling is a basic and fundamental step towards converting an analog signal into digital signal. Types of sampling with its merits and demerits with applications are discussed. Aperture effect observed in case of flat top sampling can be compensated using equalizer filter.
Sampling is a Simple method to convert analog signal into discrete Signal by using any one of its three methods
if the sampling frequency is twice or greater than twice then sampled signal can be convert back into analog signal easily......
A signal is a pattern of variation that carry information.
Signals are represented mathematically as a function of one or more independent variable
basic concept of signals
types of signals
system concepts
A wave analyzer is an instrument designed to measure relative amplitudes of single frequency components in a complex waveform. Basically, a wave instrument acts as a frequency selective voltmeter which is tuned to the frequency of one signal while rejecting all other signal components.
Sampling is a basic and fundamental step towards converting an analog signal into digital signal. Types of sampling with its merits and demerits with applications are discussed. Aperture effect observed in case of flat top sampling can be compensated using equalizer filter.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
1. Sampling Theory
In many applications it is useful to represent a signal in terms
of sample values taken at appropriately spaced intervals.
The signal can be reconstructed from the sampled waveform
by passing it through an ideal low pass filter.
In order to ensure a faithful reconstruction, the original signal
must be sampled at an appropriate rate as described in the
sampling theorem.
– A real-valued band-limited signal having no spectral
components above a frequency of B Hz is determined
uniquely by its values at uniform intervals spaced no
greater1 than
2B
seconds apart.
EE 541/451 Fall 2006
2. Sampling Block Diagram
Consider a band-limited signal f(t) having no spectral
component above B Hz.
Let each rectangular sampling pulse have unit amplitudes,
seconds in width and occurring at interval of T seconds.
f(t) A/D fs(t)
conversion
T
Sampling
EE 541/451 Fall 2006
3. Bandpass sampling theory
2B sampling rate for signal from 2B to 3B
X(f)
-3B -2B -B B 2B 3B
X(f-fs)
-3B -2B -B B 2B 3B 4B 5B
X(f+fs)
-5B -4B -3B -2B -B B 2B 3B
Xs
-5B -4B -3B -2B -B B 2B 3B 4B 5B
EE 541/451 Fall 2006
4. Impulse Sampling
Signal waveform Sampled waveform
0
0
1 201
1 201
Impulse sampler
0
1 201
EE 541/451 Fall 2006
5. Impulse Sampling
with increasing sampling time T
Sampled waveform Sampled waveform
0 0
1 201 1 201
Sampled waveform Sampled waveform
0 0
1 201 1 201
EE 541/451 Fall 2006
6. Introduction
Let gδ (t ) denote the ideal sampled signal
∞
gδ ( t ) = ∑ g (nT ) δ (t − nT )
n = −∞
s s (3.1)
where Ts : sampling period
f s = 1 Ts : sampling rate
EE 541/451 Fall 2006
7. Math
From Table A6.3 we have
∞
g(t ) ∑δ (t − nTs ) ⇔
n =−∞
∞
1 m
G( f ) ∗
Ts
∑ δ( f −
m =−∞ Ts
)
∞
= ∑ f G( f
m =−∞
s − mf s )
∞
gδ ( t ) ⇔ f s ∑G ( f
m =−∞
− mf s ) (3.2)
or we may apply Fourier Transform on (3.1) to obtain
∞
Gδ ( f ) = ∑ g (nT ) exp( − j 2π nf T )
n =−∞
s s (3.3)
∞
or Gδ ( f ) = f sG ( f ) + f s ∑G ( f
m =−∞
− mf s ) (3.5)
m ≠0
If G ( f ) = 0 for f ≥ W and Ts = 1
2W
∞
n jπ n f
Gδ ( f ) = ∑ g ( ) exp( − ) (3.4)
n =−∞ 2W W
EE 541/451 Fall 2006
8. Math, cont.
With
1.G ( f ) = 0 for f ≥W
2. f s = 2W
we find from Equation (3.5) that
1
G( f ) = Gδ ( f ) , − W < f < W (3.6)
2W
Substituting (3.4) into (3.6) we may rewrite G ( f ) as
1 ∞
n jπnf
G( f ) =
2W
∑ 2W
n = −∞
g( ) exp( −
W
) , − W < f < W (3.7)
n
g (t ) is uniquely determined by g ( ) for − ∞ < n < ∞
2W
n
or g ( ) contains all information of g (t )
2W
EE 541/451 Fall 2006
9. Interpolation Formula
n
To reconstruct g (t ) from g ( ) , we may have
2W
∞
g (t ) = ∫ G ( f ) exp( j 2πft )df
−∞
1 ∞
n jπ n f
∑ g ( 2W ) exp( − W ) exp( j 2π f t )df
W
=∫
−W 2W n = −∞
∞
n 1 n
= ∑ g(
W
n = −∞
)
2W 2W ∫−W exp j 2π f (t − 2W )df (3.8)
∞
n sin( 2π Wt − nπ )
= ∑ g( )
n = −∞ 2W 2π Wt − nπ
∞
n
= ∑ g( ) sin c( 2Wt − n ) , - ∞ < t < ∞ (3.9)
n = −∞ 2W
(3.9) is an interpolation formula of g (t )
EE 541/451 Fall 2006
10. Interpolation
If the sampling is at exactly the Nyquist rate, then
∞
t − nTs
g (t ) = ∑ g (nTs ) sin c
T
n = −∞ s
∞
t − nTs
g (t )
g (t ) = ∑ g (nTs ) sin c
T
n = −∞ s
EE 541/451 Fall 2006
11. Practical Interpolation
Sinc-function interpolation is theoretically perfect but it
can never be done in practice because it requires samples
from the signal for all time. Therefore real interpolation
must make some compromises. Probably the simplest
realizable interpolation technique is what a DAC does.
g (t )
EE 541/451 Fall 2006
12. Sampling Theorem
Sampling Theorem for strictly band - limited signals
1.a signal which is limited to − W < f < W , can be completely
n
described by g ( ) .
2W
n
2.The signal can be completely recovered from g ( )
2W
Nyquist rate = 2W
Nyquist interval = 1
2W
When the signal is not band - limited (under sampling)
aliasing occurs .To avoid aliasing, we may limit the
signal bandwidth or have higher sampling rate.
EE 541/451 Fall 2006
14. Avoid Aliasing
Band-limiting signals (by filtering) before sampling.
Sampling at a rate that is greater than the Nyquist rate.
Anti-aliasing A/D fs(t)
f(t)
filter conversion
T
Sampling
EE 541/451 Fall 2006
23. Bandpass Sampling
(a) variable sample rate
(b) maximum sample rate without aliasing
(c) minimum sampling rate without aliasing
EE 541/451 Fall 2006
24. Bandpass Sampling
A signal of bandwidth B, occupying the frequency range
between fL and fL + B, can be uniquely reconstructed from the
samples if sampled at a rate fS :
fS >= 2 * (f2-f1)(1+M/N)
where M=f2/(f2-f1))-N and N = floor(f2/(f2-f1)),
B= f2-f1, f2=NB+MB.
EE 541/451 Fall 2006
27. Time Division Multiplexing
Entire spectrum is allocated for a channel (user) for a limited time.
The user must not transmit until its
k1 k2 k3 k4 k5 k6
next turn.
Used in 2nd generation c
Frequency
f
t
Advantages: Time
– Only one carrier in the medium at any given time
– High throughput even for many users
– Common TX component design, only one power amplifier
– Flexible allocation of resources (multiple time slots).
EE 541/451 Fall 2006
28. Time Division Multiplexing
Disadvantages
– Synchronization
– Requires terminal to support a much higher data rate than the
user information rate therefore possible problems with
intersymbol-interference.
Application: GSM
GSM handsets transmit data at a rate of 270
kbit/s in a 200 kHz channel using GMSK
modulation.
Each frequency channel is assigned 8 users, each
having a basic data rate of around 13 kbit/s
EE 541/451 Fall 2006