Abstract
Telecommunication suffers from a plenty of problems both in the transmitter and in the receiver end. To maintain realizable antenna height, to provide the facility of multiplexing and channel separation and to get higher level of noise immunity, a number of modulation schemes are employed both in the case of analog and digital communication. Analog modulation signifies modification of three basic properties of analog single tone carrier signal according to the analog baseband signal to maintain realizable antenna height, to provide the facility of multiplexing and channel separation and to get higher level of noise immunity in telecommunication. In the present chapter we would essentially discuss about amplitude modulation (AM) technique. The basic rule of modulation would be defined to model the method of AM mathematically. To maximize the efficiency of the transmission method, different variations of AM like DSB-SC (Double Side Band- Suppressed Carrier), SSB (Single Side Band) and VSB (Vestigial Side Band) are employed. Along with the design of generic types of modulators and demodulators, design of AM radio receivers is also discussed in evolutionary manner.
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Notes
- 1.
Sinusoids and co sinusoids are only single tone signals.
- 2.
Initial phase angle: Phase at time t = 0.
- 3.
Only sinusoids (and cosinusoids) are single tone signal.
- 4.
As discussed before, therefore three basic parameters of a signal, especially an electrical signal, namely amplitude, frequency and phase.
- 5.
The polarity here signifies the measured terminal to the reference terminal of the input and output.
References
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Kennedy, G.: Electronic Communication Systems, 4th edn. Tata McGraw Hill, India (1993)
Chakroborti, P.: Analog Communication Systems. Dhanpat Rai & Co, India (2005)
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© 2012 Springer-Verlag Berlin Heidelberg
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Das, A. (2012). Amplitude Modulation. In: Signal Conditioning. Signals and Communication Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-28818-0_4
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DOI: https://doi.org/10.1007/978-3-642-28818-0_4
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