1 Introduction - epsic
Radiotechnique Modulation d'amplitude Chapitre 1 Radiotechnique HF / Chap 1 / Editions Léone / 2000 page - 1 - 1 Introduction Le but de la modulation est de permettre la transmission (par fil, par voie hertzienne, par fibre optique, etc ) d’une information, et de pouvoir retrouver celle-ci
1 Introduction - epsic
Radiotechnique Modulation d'amplitude Chapitre 2 Radiotechnique HF / Chap 2 / Editions Léone / 2000 page - 1 - 1 Introduction Schéma bloc d’un modulateur Modulateur Signal modulant Porteuse Signal modulé La porteuse est de forme sinusoïdale Le signal modulant peut être analogique de forme quelconque, ou numérique
Introduction to Modulation: Amplitude Modulation(AM)
Basic Concept of Modulation The information source Typically a low frequency signal Referred to as the “baseband signal” Carrier A higher frequency sinusoid Example: cos(2π10000t) Modulated Signal Some parameter of the carrier (amplitude, frequency, phase) is varied in
Introduction to Modulation and Demodulation
Analogue Modulation – Amplitude Modulation v c (t) = V c cos( c t), peak amplitude = V c, carrier frequency c radians per second Since c = 2 f c, frequency = f c Hz where f c = 1/T Consider a 'sine wave' carrier Amplitude Modulation AM In AM, the modulating signal (the message signal) m(t) is 'impressed' on to the amplitude of the carrier
AMPLITUDE MODULATION - Auburn University
52 - A1 Amplitude modulation As an example of an AM signal derived from speech, Figure 5 shows a snap-shot of an AM signal, and separately the speech signal There are no amplitude scales shown, but you should be able to deduce the depth of modulation 1 by inspection speech AMAM Figure 5: AM derived from speech other generation methods
Digital Modulation in Communications Systems — An Introduction
3 5 Quadrature Amplitude Modulation (QAM) 3 6 Theoretical bandwidth efficiency limits 3 7 Spectral efficiency examples in practical radios 3 8 I/Q offset modulation 3 9 Differential modulation 3 10 Constant amplitude modulation 4 Filtering 4 1 Nyquist or raised cosine filter 4 2 Transmitter-receiver matched filters 4 3 Gaussian filter
Introduction to Digital Modulation
Introduction to Digital Modulation EE4367 Telecom Switching & Transmission Prof Murat Torlak Introduction In a digital communication system, the source to be transmitted is discrete both in time and amplitude Digital information carrying signals must be first converted to an analog waveform prior to transmission
RELATIVE SIDEBAND AMPLITUDES VS MODULATION INDEX FOR COMMON
The expression for the residual carrier amplitude is obtained by setting n = 0 in Equation (1): Note that the right-hand side of Equation (3) has the form of sin x/x, which has a limit value of 1 asx - 0; for the no-modulation case, the carrier ampli- tude is equal to 1 The expression for the first sideband amplitude term (n = 1) is
1 Introduction Schéma bloc d’un modulateur - epsic
Radiotechnique Modulation de fréquence Chapitre 3 Radiotechnique HF / Chap 3 / Editions Léone / 2000 page - 1 - 1 Introduction Schéma bloc d’un modulateur Modulateur Signal modulant Porteuse Signal modulé La porteuse est de forme sinusoïdale Le signal modulant peut être analogique de forme quelconque ou numérique
1 Introduction Schéma bloc d’un modulateur - epsic
4 Modulation en quadrature Lorsque le saut de phase désiré doit être différent de 180°, la modulation en quadrature s’impose C’est un type de modulation consiste à prendre deux porteuses de même fréquence, mais déphasées l’une par rapport à l’autre de 90° (quadrature) Ces porteuses sont ensuite modulées en amplitude, sans
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