File Name: difference between phase modulation and frequency modulation .zip
Modulation is the process by which information is encoded from a message source in order to optimize it for transmission. Frequency Modulation FM is the encoding of information in a carrier wave by changing the instantaneous frequency of the wave. FM technology is widely used in the fields of computing, telecommunications, and signal processing.
The concepts of signal phase modulation and signal frequency modulation, and the difference between them, are often a source of confusion. Ditto for the related idea of phase distortion. To understand phase distortion, recall that any waveform can be considered to be a sum of sine waves of different amplitudes and frequencies.
How do the different modulation schemes compare in terms of performance and applications? Thus, we need to have a general idea of which modulation scheme is appropriate for a particular application. Amplitude modulation is straightforward in terms of implementation and analysis. Also, AM waveforms are fairly easy to demodulate. Overall, then, AM can be viewed as a simple, low-cost modulation scheme. As usual, though, simplicity and low cost are accompanied by performance compromises—we never expect the easier, cheaper solution to be the best one.
How do the different modulation schemes compare in terms of performance and applications? Thus, we need to have a general idea of which modulation scheme is appropriate for a particular application. Amplitude modulation is straightforward in terms of implementation and analysis. Also, AM waveforms are fairly easy to demodulate. Overall, then, AM can be viewed as a simple, low-cost modulation scheme. As usual, though, simplicity and low cost are accompanied by performance compromises—we never expect the easier, cheaper solution to be the best one. However, the applications of analog amplitude modulation are currently quite limited, because AM has two significant disadvantages.
This invention relates to indirect frequency modulators and more specifically to those indirect frequency modulators using phase locked loop techniques. Phase locked loop techniques have been known since the early 's but had been somewhat avoided because of their high cost and complexity in discrete system design. With the developments in integrated circuit design and processing this situation is rapidly changing and phase locked loops are becoming versatile building blocks with many applications. Basically a phase locked loop is a frequency feedback system comprised of a phase detector, a low-pass filter and a voltage controlled oscillator VCO with a feedback path. When the input signal to the loop is zero the voltage controlled oscillator operates at a predetermined free-running frequency.
Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Amplitude, Phase, and Frequency Modulation Abstract: This paper presents a comparative theoretical study of amplitude, phase, and frequency modulation. In the first part, the fundamental mathematical expressions for the three types of modulation are derived. They are expressed in three different forms: as amplitude equations, side band equations and modulation vector equations. The amplitude equations indicate the envelope of the radio-frequency directly.
Phase Modulation is a modulation in which the phase of the carrier wave changes according to the instantaneous amplitude of the modulating.
AM came first—it was easy to implement and easy to understand. In , Edwin H. You can experience this yourself—listen to an AM station during a thunderstorm when bursts of static electricity are causing interference in the station, and then switch to an FM station. Amplitude modulation a , frequency modulation b , and phase modulation c.
Modulation Rate Similar to the modulation amount, as the rate of frequency modulation increases the hop rate , the time that EMI will be in-band for a given Thus, the frequency can be modulated by the switching signal which is coded by a sequence of digital data and an FSK modulation can be generated directly by the antenna. It is in the field of telecommunications and signal processing, that this kind of technique is mostly used. Wideband Frequency Modulation Pdf. For example, a VCO is being modulated by a very slow changing control voltage to generate 1 … Find out what is the most common shorthand of Wideband Frequency Modulation De-modulator on Abbreviations. For example, a VCO is being modulated by a very slow changing control voltage to generate 1 GHz span.
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