Lecture 13 Frequency Modulation Pdf 6.02 spring 2010, lecture 13 motivation for high frequency modulation modulation is used to change the frequency band of a signal enables rf communication in different frequency bands used in cell phones, am fm radio, wlan, cable tv, . note: higher frequencies lead to smaller antennas 3ghz, 10cm wavelength, 2.5cm antenna (1 4 wavelength). In the simplest case, the predictor is just the previous value of the signal ^m[k] = m[k 1] this works pretty well, and can greatly improve the dynamic range. this is called delta modulation, and we'll come back to this shortly. the next version uses a locally linear approximation using the di erence as an approximation to the derivative rst ^m.
Frequency Modulation And Modulation Index Pdf Frequency Modulation Phase modulation is closely related to frequency modulation and many of the conclusions that we can draw from frequency modulation also apply to phase modulation. Lecture 13 free download as pdf file (.pdf), text file (.txt) or view presentation slides online. this document discusses the bandwidth of angle modulated waves like fm and pm. 1. 13 continuous time modulation in this lecture, we begin the discussion of modulation. this is an important concept in communication systems and, as we will see in lecture 15, also pro vides the basis for converting between continuous time and discrete time sig nals. Phase modulation results when the phase angle f of the carrier is a function of the modulating signal. ∆Φ is the peak phase deviation. the modulator shown in block diagram form in figure can generate this fm. the envelope contains a residual amplitude modulation and, therefore, varies with time.
Fundamentals Of Frequency Modulation Pdf Detector Radio Modulation 1. 13 continuous time modulation in this lecture, we begin the discussion of modulation. this is an important concept in communication systems and, as we will see in lecture 15, also pro vides the basis for converting between continuous time and discrete time sig nals. Phase modulation results when the phase angle f of the carrier is a function of the modulating signal. ∆Φ is the peak phase deviation. the modulator shown in block diagram form in figure can generate this fm. the envelope contains a residual amplitude modulation and, therefore, varies with time. Frequency multiplication: wideband fm from narrowband fm the output carrier frequency = n x f c the output modulation index = n x β fm the output bandwidth increases according to carson’s rule. Frequencymodulationisanewdevelopmentintheartofradio,and. shortcutsshouldbeusedonlywhenthefeaturesthatfrequencymodula tionstandsforarenotviolated. themainfeaturesarehigh fidelity. transmissionandamodulationsystemthatavoidssomeoftheinterference. otherwiseoccurringinthetransmissionbymeansofcarriercurrents. Analog communicationlecture 13 free download as pdf file (.pdf), text file (.txt) or view presentation slides online. this document discusses fm generation and demodulation techniques. Determining a closed form expression for the spectrum of signal φfm(t) for arbitrary modulation deviation index values is not possible. therefore we will investigate the single tone modulation case:.
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