This document discusses frequency modulation (FM) including its definition, modulation index, spectrum characteristics, types of FM modulation, generation of FM using phase modulation, advantages and disadvantages compared to other modulation techniques, and applications of FM such as in radio broadcasting, television sound, and satellite television. FM provides noise immunity and allows adjusting the noise level by changing the frequency deviation. It is widely used for radio but requires more complex transmission and reception equipment than other modulation methods.
Details: https://electronicsembeddedworld.blogspot.com/2018/06/performance-management-mcq.html
FM demodulation involves changing the frequency variations in a signal into amplitude variations at baseband, e.g. audio. There are several techniques and circuits that can be used each with its own advantages and disadvantages.
In any radio that is designed to receive frequency modulated signals there is some form of FM demodulator or detector. This circuit takes in frequency modulated RF signals and takes the modulation from the signal to output only the modulation that had been applied at the transmitter.
There are several types of FM detector / demodulator that can be used. Some types were more popular in the days when radios were made from discrete devices, but nowadays the PLL based detector and quadrature / coincidence detectors are the most widely used as they lend themselves to being incorporated into integrated circuits very easily...
RF Carrier oscillator
To generate the carrier signal.
Usually a crystal-controlled oscillator is used.
Buffer amplifier
Low gain, high input impedance linear amplifier.
To isolate the oscillator from the high power amplifiers.
Modulator : can use either emitter collector modulation
Intermediate and final power amplifiers (pull-push modulators)
Required with low-level transmitters to maintain symmetry in the AM envelope
Coupling network
Matches output impedance of the final amplifier to the transmission line/antenn
Applications are in low-power, low-capacity systems : wireless intercoms, remote control units, pagers and short-range walkie-talkie
Modulating signal is processed similarly as in low-level transmitter except for the addition of power amplifier
Power amplifier
To provide higher power modulating signal necessary to achieve 100% modulation (carrier power is maximum at the high-level modulation point).
Same circuit as low-level transmitter for carrier oscillator, buffer and driver but with addition of power amplifier
Details: https://electronicsembeddedworld.blogspot.com/2018/06/performance-management-mcq.html
FM demodulation involves changing the frequency variations in a signal into amplitude variations at baseband, e.g. audio. There are several techniques and circuits that can be used each with its own advantages and disadvantages.
In any radio that is designed to receive frequency modulated signals there is some form of FM demodulator or detector. This circuit takes in frequency modulated RF signals and takes the modulation from the signal to output only the modulation that had been applied at the transmitter.
There are several types of FM detector / demodulator that can be used. Some types were more popular in the days when radios were made from discrete devices, but nowadays the PLL based detector and quadrature / coincidence detectors are the most widely used as they lend themselves to being incorporated into integrated circuits very easily...
RF Carrier oscillator
To generate the carrier signal.
Usually a crystal-controlled oscillator is used.
Buffer amplifier
Low gain, high input impedance linear amplifier.
To isolate the oscillator from the high power amplifiers.
Modulator : can use either emitter collector modulation
Intermediate and final power amplifiers (pull-push modulators)
Required with low-level transmitters to maintain symmetry in the AM envelope
Coupling network
Matches output impedance of the final amplifier to the transmission line/antenn
Applications are in low-power, low-capacity systems : wireless intercoms, remote control units, pagers and short-range walkie-talkie
Modulating signal is processed similarly as in low-level transmitter except for the addition of power amplifier
Power amplifier
To provide higher power modulating signal necessary to achieve 100% modulation (carrier power is maximum at the high-level modulation point).
Same circuit as low-level transmitter for carrier oscillator, buffer and driver but with addition of power amplifier
AM – Frequency spectrum – vector representation – power relations – generation of AM – DSB, DSB/SC, SSB, VSB AM Transmitter & Receiver; FM and PM – frequency spectrum – power relations : NBFM & WBFM, Generation of FM and DM, Armstrong method & Reactance modulations : FM & PM frequency.
Chatbots: AI-powered chatbots are used in CRM systems to provide automated customer support and assistance. Chatbots can handle a wide range of customer inquiries, answer frequently asked questions, and provide relevant information in real-time. They can engage in natural language conversations, understand customer intent, and provide personalized recommendations or solutions.
Frequency modulation is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. The technology is used in telecommunications, radio broadcasting, signal processing, and computing.
The presentation is made by me. I am a student of EEE, RUET.
verilog code and Test bench for
Basic Gate
half adder
full adder
half subtractor
full subtractor
mux
demux
encoder
decoder
BCD to E-3
E-3 to BCD
binary to BCD
BCD to binary
Ripple carry adder
water softener circuit detail and water monitoring system using Wireless Sensor Network (zigbee configuration) Arduino software coding and real time matlab plotting of arduino data.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
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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.
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.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
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/
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
2. Content
1. Flow diagram
2. What is frequency modulation?
3. Frequency modulation index
4. Significant-sidebands Spectrum
5. Types of FM
6. Generation of FM using PM
7. Advantages and disadvantages
8. Comparison with FM and PM
9. Applications
3. Modulation
Pulse Wave
Modulation
Amplitude
Modulation
Continuous Wave
Modulation
Linear Modulation
Non-Linear
Modulation
Frequency
Modulation
Phase Modulation
4. What is frequency modulation?
When the frequency of carrier wave is changed in
accordance with the message signal, The process is called
frequency modulation.
In FM the carrier amplitude remain constant the carrier
frequency varies
It is a type of Angle modulation
Why Frequency modulation is called nonlinear-modulation?
5.
6. FM modulation index
• FM modulation index is equal to the ratio of the
frequency deviation to the modulating frequency.
• Thus the formula for the modulation index for FM
is simply given by that shown below:
Frequency Deviation
Modulating Frequency
And also,
7. Significant Sidebands – Spectrum
• The table below shows the number of significant
sidebands for various modulation
No of sidebands 1% of
unmodulated carrier
Bandwidth
0.1 2 2fm
0.3 4 4fm
0.5 4 4fm
1.0 6 6fm
2.0 8 8fm
5.0 16 16fm
10.0 28 28fm
Example:
For = 5,
16 sidebands
(8 pairs).
8. Types of FM
Narrow band FM
1. Narrow band FM is defined as the situation where the
modulation index is small.
2. From the table of Bessel functions it may be seen that for
small , ( 0.3) there is only the carrier and significant
sidebands, i.e. BW = 2fm.
FM with 0.3 is referred to as narrowband FM (NBFM).
3. Maximum modulating frequency is usually 3kHz
4. maximum frequency deviation is =75 kHz.
9. Types of FM
Wide band FM
1. Wideband FM is defined as the situation where the
modulation index is larger.
2. For > 0.3 there are more than 2 significant sidebands. As
increases the number of sidebands increases. This is referred
to as wideband FM (WBFM).
3. Modulation frequencies extend from 30 Hz to 15 kHz.
4. Maximum permissible deviation is=75 kHz.
5. Wideband FM system need large bandwidth, typically 15 times
that of narrowband FM system.
10. Generation of FM using PM
Modulating Wave x(t) FM Wave
Integrator
Phase
Modulator
Carrier
Oscillator
dtt x ) (
Eccos(2fct)
11. Advantages
1. Amplitude of the frequency modulated wave remains
unaffected.
2. Large decrease in noise, hence increase in S/N ratio.
3. Noise may reduce by increasing deviation.
4. Frequency allocation allows for a guard band which
reduces adjacent channel interference.
5. Operate In Very high frequency (VHF).
12. Disadvantages
• FM has too much advantages besides it also has some
disadvantages
1. FM wave can’t cover large area.
2. Transmitting & receiving equipments for FM are
complex & costly.
3. A much wider channel, typically 200 kHz, is needed for
FM.
13. Comparison of FM with PM
Sr.
No.
FM PM
1 Frequency deviation is proportional to
modulating voltage
Phase deviation is proportional
to the modulating voltage
2 Noise immunity is better than AM and PM Noise immunity is better than
AM but worse than FM
3 SNR is better than PM SNR is worse than FM
4 FM is widely used for radio broadcasting PM is only used in some mobile
systems
5 It is possible to receive FM on PM receive It is possible to receive PM on
FM receive
6 Modulation index is proportional to
modulating voltage as well as the modulating
frequency .
Modulation index is
proportional to modulating
voltage
14. Comparison of FM and AM
Sr.
No.
FM AM
1 FM receivers are immune to noise AM receivers are not immune
to noise
2 It is possible to decrease noise by increasing
deviation
This feature is absent in AM
3 Bandwidth is higher and depends on modulation
index
Bandwidth is lower
compared to AM but
independent of modulation
index
4 FM transmission and reception equipment are more
complex
FM transmission and
reception equipment are less
complex
5 All transmitted power is useful Carrier power and one
sideband power is useless
15. FM Radio
FM radio uses a modulation index, m > 1, and this is called wideband FM. As its name
suggests the bandwidth is much larger than AM.
In national radio broadcasts using FM, the frequency deviation of the carrier fc , is
chosen to be 75kHz, and the information baseband is the high fidelity range 20Hz to
15kHz.
BW of FM radio=2(75k+15k)
=180khz
Applications:
16. Television Sound:
In terrestrial TV broadcasts, the video information is transmitted using AM .
However the sound information is transmitted using FM, in order to reduce possible
interference between the video and sound signals. In this case, the maximum deviation of
the carrier, fc , is chosen to be 50kHz, and the information baseband is again the high
fidelity range 20Hz to 15kHz. Therefore the bandwidth required for TV Sound is:
BW Of TV Sound=2(50k+15k)
=130khz
Satellite TV.
Some satellite TV transmissions broadcast an analogue video signal using FM. This
helps to obtain an acceptable signal at the receiving station In this case, the maximum deviation
of the carrier fc , is chosen to be about 10 MHz, with a video baseband of around 5MHz.
Therefore the bandwidth required for Satellite TV is:
BW of satellite TV =2(10+5)
=30Mhz
17. References
• http://www.silabs.com/Marcom%20Documents/Resources/FMTutorial.pdf
• http://en.wikibooks.org/wiki/Communication_Systems/Frequency_Modulati
on
• http://www.radio-electronics.com/info/rf-technology-design/fm-frequency-modulation/
spectrum-bandwidth-sidebands.php
• http://searchnetworking.techtarget.com/definition/frequency-modulation
• https://www.youtube.com/watch?v=SmW4z76KgNQ
• https://www.standrews.ac.uk/~www_pa/Scots_Guide/RadCom/part12/page
1.html
• Analog and digital communication system by Sanjay Sharma.
• Modern digital and analog communication systems by B.P. Lathi
Editor's Notes
Because frequency will be changed according to the baseband signal
Because FM receiver may be filtered with amplitude limiters to remove the amplitude variation caused by noise this makes FM reception a good deal to immune noise.
In AM this feature is absent
98.3 channel’s some interference will be get in both adjacent channels compare with FM in AM it will be very high
88Mhz to 108Mhz
Delta f=k e & delta f= k e
Refer advantages
Refer advantages
Application
Vice-versa
M=k e /f & M=k e