Bandwidth-Efficient Amplitude Modulations 19 Dr. Talal Skaik IUG 2016 For >0, s(t) = (A c+m(t))cos(2f ct) = A c(1+ m(t))cos(2f ct) We need bandwidth of m(t) f cand modulation index <1. c = 10sin(2v250,000t) V is amplitude-modulated by the information signal given above. Amplitude modulation (AM) is similar to DSB but has the advantage of permitting a simpler demodulator, the envelope detector. It is commonly used in the transmission of information . Short Questions and Answers on Amplitude Modulation Q.1. Vary the frequency and amplitude of the modulating signal, and check the corresponding variations of the modulated signal. Let's solve a problem based on Amplitude Modulation.

MODULATION EXERCISES Moreover, the amplitude 2 and phase 3 can be obtained from and the carrier signal as follows. 15934 Numerical Problems Transmitter Modulation. Problem Suppose, a radio station generates modulating signal wave m ( t ) = 1 0 cos ( 2 1 0 3 t ) Now, it is amplitude modulated with a carrier signal c ( t ) = 5 0 cos ( 2 1 0 5 t ) . In a hybrid modulation with the following constellation pattern, the outlying signal sig2, has higher energy (i.e. But, in the same Page 18/44 The proposed method effectively corrects the frequency splitting problem resulting from time-varying amplitude changes. Fm Figure P7.3. c T 2. is a large integer.

The AM modulation index is merely the relative level of modulation; the term has a different and simpler meaning for amplitude modulation than it does for frequency modulation. 10 CHAPTER 3. Let us try to develop an equation for the Modulation Index. From an information theory point of view, the power in the carrier . c(t) = Ac cosct is called the carrierwave.

Soln. AM was the earliest modulation method u Abstract. Amplitude Modulation (AM) (Ch. Find more Examples given in this chapter serve as an introduction in AM, FM, and phase modulation techniques and basic principles. f(t) fPAM (t) t t. 7 I.13 Generating a PAM signal could be divided into two processes: sampling and holding Note that the modulated signal envelope corresponds to the wave form of the DSB AM modulating signal.