fm modulation and demodulation experiment pdf

fm modulation and demodulation experiment pdf

modulation depth). In this experiment, we shall consider demodulation using envelope detector. 2 Out VCO Out CLA CLB This method is widely used in telecommunication devices to transmit voice without disturbances. View comm_exp2__FM_modulation.pdf from EEE 485 at Shahjalal University of Science & Technology. . Describe phase demodulation circuit operation for the peak, low-pass filter, and conversion detectors. Frequency modulation is widely used for radio transmissions for a wide variety of applications from broadcasting to general point to point communications. frequency and amplitude of modulating signal Frequency: Hz. We will discuss the problem of frequency bandwidth of FM signals and understand significance of the Carson rule.

Each experiment, whenever applicable, contains the following sections: Objectives: where the expected achievements by the end of the experiment are stated. . To analyze the demodulated FM and PM signal using the MATLAB Coding 3. For M = 1 (i.e., 100% modulation), the envelope of the modulated signal periodically reaches zero, and the sidebands are 6 dB below the . The signal has a power , so that , where A represents the peak value of sinusoidal carrier. shriapatil. Frequency demodulation is an essential process in telecommunication engineering. . A PLL can "lock onto" the frequency of an incoming waveform. . The VCO portion of an LM565 is used to create the FM waveform, and an LM565 phase-locked-loop (PLL) operates as the FM detector. To understand the characteristics of varactor diodes. These were defined in the chapter entitled Analysis of the FM spectrum . Experiment # 7 FM Modulator Analog Communication Systems 7-1 : Curriculum Objectives I. Time-division multiplexing systems, Frequency division multiplexing systems. This is the ratio of the modulation amplitude and the amplitude of the unmodulated carrier. 2. shameemklu. In radio communication, Frequency modulation (FM) is the method of conveying information over a carrier wave by varying its frequency. 3 Lab Part II: FM Demodulation Over the past decade the tremendous development of Wireless Communications has changed human life incredibly. Information bits are represented in a change of frequency of the carrier in binary frequency shift keying (BFSK). Frequently the various types of modulation are combined. A PLL circuit is constituted by a phase comparator (the MC14046B actually contains two), a VCO, and a . FM Modulation and Demodulation. The illustration of FM demodulation is shown in Fig.2.

This example uses: Communications Toolbox Communications Toolbox; Simulink Simulink; Open Model. 1.2 Prelab Exercise 1. . It involves converting a signal from one frequency to another frequency. Use a 100 Hz square wave to frequency-modulate the HP3314A VCO. Analog Communication Systems 7-1 : Curriculum Objectives . 1) Slide 23 Experiment 8.2 Spectrum of an FM Signal Slide 24 Experiment 8.2 FM Spectrum (cont. 2. The output will thus notbe a copy of the message. Frequency Modulation. EGYPT. 1) Slide 28 . To run the model, open the example by entering fmmoddemod at the MATLAB command prompt. It should respond only to the frequency changes. When it comes to amplitude or frequency modulation it entails a tool, called a demodulator or detector, which produces a signal corresponding to the instantaneous changes in amplitude or frequency, respectively. To understand the operation theory of demodulation of FM and PM signal 2.

Enter the email address you signed up with and we'll email you a reset link. 1) Slide 25 Experiment 8.2 FM Spectrum (cont. It depends on the actual modulation type whether or not the spectra become similar with respect to shapes, symmetries, and bandwidths. It is now necessary to de-embed the transmitted message, see Fig. 2. The signal has a power , so that , where A represents the peak value of sinusoidal carrier. In this experiment we will introduce the operations of phase discrimination method as demodulation. Amplitute: V. Close Create . FM Modulation and Demodulation Circuit. 2. Single Side Band Demodulation Objective: In this experiment we will observe SSB Demodulation The experiment is setup as per the above block diagram. FM Modulator Figure 1 illustrates the FM modulator circuit. Demodulation: The Phase-Locked Loop. Most forms of static and electrical noise are naturally AM, and an FM receiver will not respond to AM signals. Arrange the functional blocks as shown in Simulink model. 2. The example, shows how the FM Modulator Baseband and FM Demodulator Baseband blocks are used to modulate and demodulate a sinusoidal signal. The FM demodulator must satisfy the following requirements: (i) It must convert frequency variations into amplitude variations. Modulation index can be defined as the measure of extent of amplitude variation about a unmodulated carrier. An FM signal is a member of the class defined as undergoing non-linear modulation. Figure 3 suggests the principle. To understand the operation theory of voltage controlled oscillator (VCO). Adjust the amplitude of the square wave to obtain a peak frequency deviation of 1 kHz. In this process, the amplitude of the carrier signal is varied so that it is proportional to the instantaneous amplitude of the modulating . Part IV: FM Demodulation Using Frequency Discriminator 1. 4. To design and implement the frequency modulator by using the voltage controlled oscillator. 3.Observe the output of the codec as you vary the frequency of the message. What is Demodulation?

FM Modulation and Demodulation Circuit. . : 08 Name of the Experiment: Implementation of demodulation of FM and PM signal using MATLAB coding Objective: 1. . Ans. Course Out-Come: 1. These will be on exact harmonics of the original message. Generation and detection of AM,DSB-SC, SSB and FM signals. Theory . We Acknowledge NITK and PALS for extending their support towards successful completion of this experiment . 3.

1.Write a new code to generate an FM signal. It would be an advantage if the experiment entitled Sampling with SAMPLE & HOLD (Volume D1) has also been completed. (iii) The demodulator circuit should be insensitive to amplitude changes. EXPERIMENT 8 FREQUENCY MODULATION N0GSG. We will become familiar with generation of FM signals and their demodulation methods. 3. Phase Comp. Experiment 5: Frequency Modulation and Demodulation Last Modified: 1/17/2014 ECE440: Transmission of Information Page 6 of 8 6.

Muhamad Asvial, MEng., PhD Center for Information and Communication Engineering Research Electrical Engineering Department - University of Indonesia Kampus UI Depok, 16424 - Indonesia Fundamental design in Communication System Modulation Modulation In the following illustrations we will have a fixed message, V m cos m t and vary V DC to obtain different types of Double Sideband modulation. Pulse shaping enables successful demodulation at the receiver side. . 6a. A three-step process will allow you to become more familiar with FM: First, a frequency modulation system will be created and simulated using Simulink. The 'demodulator' will give an output of many frequency components, one from each of the sidefrequency pairs. VARIOUS METHOD OF FM DEMODULATION Demodulation:-It is the process of deriving the original modulation signal from a modulated carrier wave. The amplitude of the carrier remains constant. In theory, an ideal frequency modulation (FM) detector is a device that produces an output that is proportional to the instantaneous frequency of the input. Search. Yet, AM continues to be used today in many communication applications Determine the permissible range in maximum modulation index for (i) Commercial Fm which has 30Hz to 15Hz mod frequencies (ii) Narrow . To explain the spectrum of . it is . 61 A: AM Let A be a function of time, At()=A o (1+mcos M t), where the carrier frequency Connect the AM Demodulation Principle. This book is focused on special circuits dedicated to the RF level of wireless Communications. Procedure . Prelab 1 - AM Modulation - Prof. Dutton - EE133 Winter 2004 1 EE133 - Prelab 1 Amplitude Modulation and Demodulation 1 Introduction This week we will be taking a look at the amplitude modulation (AM) scheme. BPSK Modulation and Demodulation(Real time experiment . Experiment 4 dB dB 1 frequency modulation 1 amplitude modulation 0 0 frequency modulation Filter Slope FM + AM Noise amplitude modulation AM Modulation signal+AM Noise Envelope detector Figure 1: FM Detection Using a Slope Detector (with a corner frequency 1 ) at 0 and take a frequency deviation of . Experiment # 7 FM Modulator . Try to run it now. INTRODUCTION In chapters 1 and 2 you studied how to apply intelligence (modulation) to an rf-carrier wave . 250+ TOP MCQs on Types of Frequency Modulation and Answers ; 250+ TOP MCQs on Single Tone Modulation and Answers ; 250+ TOP MCQs on Transmitter and Answers ; The demodulation of FM signals using PLL circuits is currently the most widely used method. When a level of modulation is too low, the modulation does not utilize the carrier efficiently and if a level of . BPSK modulation & demodulation (Matlab & Python . Add time domain and frequency domain scopes to the output (similar to the ones you had in the AM experiment). 1. This experiment is in two parts, an FM modulator and an FM detector. 3. . A phase-locked loop (PLL) can be used to create a complex but high-performance circuit for FM demodulation. On the other hand, the theory may be applied to the demodulation or filtering of rather arbitrary types of stationary signal and noise processes. : 02 Experiment Name: Frequency

Pll Circuit Using Ic 565 PDF Download playcube org. MODULATION & DEMODULATION Questions and Answers pdf free download also objective multiple choice interview 2 mark important questions lab viva manual book. If it runs, great. ADVANCED MODULES . Chapter 7 FM Modulator (t) = Ac cos O(t) = Ac cos [2nfct + 2TCfA fx(l) dl] . A Binary Phase Shift Keying(BPSK) signal can be defined as where b ( t ) = +1 or -1 , fc is the carrier frequency, and T is the bit duration. Demonstrate understanding of various amplitude modulation and demodulation techniques. Frequency modulation (FM) is a type of modulation where the frequency of the carrier is varied in accordance with the modulating signal.

This signal . 1) Slide 26 Experiment 8.2 FM Spectrum (cont. Connect the function generator to the spectrum analyzer as indicated in Fig. The m-file pre6_1.m is designed to show the frequency variation more clearly in the time domain. Frequency modulation, FM offers many advantages, particularly in mobile radio applications where its resistance to fading and interference is a great . Please use Chrome. Cumsum models the integration operation for a digital signal, which means that the . EXPERIMENT 5 Frequency Modulation 1 Objective To understand the principles of frequency modulation and demodulation. Frequency Modulation and Demodulation Simulator. A scheme for achieving this result was introduced earlier - the zero-crossing counter demodulator - and is shown modelled in figure 3. Frequency Modulation (FM) is an important modulation scheme both because of its widespread commercial use, and because of its simplicity. The circuitry is designed to operate in the VLF band at a carrier frequency of 100 kHz. I. Initialization: Copy the initialization files for the experiment into your Matlab working . Frequency Modulation(Simulation experiment).. Introduction . Feedback . What will happen when the input to the synchronous demodulator is an FM signal ? The FM output for a square wave looks like Frequency Shift Keying (FSK). 2 Theory 2.1 Introduction A sinusoidal carrier c()t =Acos(ct +0) has three parameters that can be modified (modulated) according to an information signal f.(t) 1. 2.2 FM Demodulation Using Slope Detection One type of conventional analog FM demodulation is achieved by determining the instantaneous frequency of an FM generated signal. 2. Note, when a modulator is set up, V DC is fixed at a particular value. LM565 .

FM Modulation and Demodulation. .

From Oscillators to Modulation and Demodulation and from Mixers to . Build a Simulink block diagram for the FM modulator exactly like the one you presented in your lab preparation.

Browser not supported Safari version 15 and newer is not supported. 16 Narrowband FM Only the J o and J 1 terms are significant Same Bandwidth as AM Using Eulers identity, and (t)<<1: Notice the sidebands are "sin", not "cos" as in AM Narrowband FM as a Phaser AM . In an FM signal, the frequency of the signal is changed by the modulation (baseband) signal while its amplitude remains the same.

To study sampling and reconstruction of Pulse Amplitude modulation system 6.

The example, shows how the FM Modulator Baseband and FM Demodulator Baseband blocks are used to modulate and demodulate a sinusoidal signal. Modulation is the process of influencing data information on the carrier, while demodulation is the recovery of original information at the distant end of the carrier. ACHIEVEMENTS: generation and demodulation of pulse width modulated (PWM) and pulse position modulated (PPM) signals. is purely theoretical because they are the same in practice B 2(a) is a Simulink-based model of the DCM circuit given by (1), with analog modulating input Xs x as in Fig The proposed topology is well suited for a pipelined clocking scheme allowing increased oversampling ratios for both first and higher order modulators What does modulate mean? BPSK Modulation and Demodulation(Real time experiment . The modulator The modulator outputs two files, the first with the modulated signal exactly N real elements long and the FM Modulator Figure 1 illustrates the FM modulator circuit. Modulation is the process of altering the characteristics of the amplitude, frequency, or phase angle of the high-frequency signal in accordance with the instantaneous value of the modulating wave. 16.1, which is the function of demodulator circuit. To study frequency modulation and determine its modulation factor 4.

Second, an FM demodulator based on a Phase Locked Loop (PLL) will be designed and simulated, using the previous modulator as the "signal source". modulation of a radio frequency (RF) carrier that has been frequency-modulated by an RC-filtered white- noise spectrum and corrupted in the channel by additive white Gaussian noise. This experiment deals with the basic performance of Frequency Modulation (FM). Modulation is the process of transforming a baseband message to a form suitable for Fig.1 Power spectra for signals in the modulation and demodulation processes.

The input data is a sine wave of frequency 4 Hz and amplitude 1 V. The frequency deviation is set to 50 Hz. . Search: Analog Frequency Modulation Circuit. The modulation index is an important factor. 5 PAM Generation and Demodulation 27 6 DSB-SC using multiplier IC AD633 33 7 AM generation and Demodulation using AD 633 39 8 FM using 555 47 9 FM - Modulation and Demodulation using PLL 51 10 Mixer Circuit using BJT 57 A Quick Reference: Component Details 61 A.1 Intermediate Frequency Transformer . Experiment No. Quiz . 3) Slide 26 Experiment 8.3 Demodulation by a Discriminator Slide 27 Experiment 8.3 Discriminator (cont. The main advantage of FM is its audio quality and immunity to noise. Objective: FM modulation and demodulation Description: In this experiment you will design a FM modulator and a derivative based FM demodulator. A simple FM demodulator, if it reproduces the message without distortion, will provide further confirmation that the VCO output is indeed an FM signal. Part 2: FM Demodulation. Learn how to generate FM signal. Considerable advancement has been made in the design and architecture of communications related RF and Microwave circuits. An FM demodulator would need to (re)combine all the sidefrequencies of an FM signal into a singlecomponent at message frequency. Slot Booking Procedure . To analyze the frequency spectrum of the demodulated FM and PM signal using MATLAB 4. Color TV for instance uses AM for brightness, FM for the sound and PM for the hue. To study amplitude demodulation by linear diode detector 3.

Frequency Modulation (FM): Here, the frequency of the carrier wave is changed according to the information signal In other words, the signal is multiplied by a square wave at the carrier frequency Although the sigma-delta modulator was first intro- In linear modulation, the amplitude of the transmitted signal varies linearly with the modulating digital signal, m(t) Observe the demultiplexed . In this chapter we will learn about frequency modulation (FM) of signals: linear (LFM), sinusoidal (SFM) and arbitrary. 3. . Q1. Sampling THEORY, Pulse modulation. The output signal via a demodulator may describe the sound, images, or binary data.

4. To study Pulse Amplitude Modulation a. using switching method b. by sample and hold circuit 7. FM demodulation using PLL. 8. Fig.2:Illustration of a frequency demodulation Procedure 1. 2.Use 100Hz for your message and 500Hz for the carrier frequency.

WBFM - Wideband Frequency Modulation Carson's Bandwidth Rule EELE445-14 Lecture 31.

The student is not allowed to pass this information to the demodulator so there is no prior knowledge of the random bit sequence being used in the demodulator. The FM signal can be summarized as follows: . The type of modulation is determined by the modulation depth, which for a fixed m(t) depends on the DC offset, V DC. digital modulation experiments include PCM encoding and decoding, line codes and digital carrier modulation (ASK and FSK). Describe fm demodulation circuit operation for the phase-shift and gated-beam discriminators and the ratio-detector demodulator. The zero-crossing-counter demodulator A simple yet effective FM demodulator is one which takes a time average of the zero crossings of the FM signal. (ii) This conversion must be linear and efficient. exactly , the use of the PLL it to control the VCO so it track the phase an frequency of the reference signal. The circuitry is designed to operate in the VLF band at a carrier frequency of 100 kHz. Learn how to build FM demodulator. To study PLL 565 as frequency demodulator 5. However, bitcheckxx.m uses this information to test the demodulator output.

fm modulation and demodulation experiment pdf

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fm modulation and demodulation experiment pdf

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