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Consumer Electronics by S. P. Bali

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ANALOG METHODS

The two most important analog methods are amplitude modulation and angle modulation. Amplitude modulation (AM) with both sidebands and carrier present is most common for certain application, such as radio broadcasting and radio telephony (see Fig. 39.1).

More economical versions of AM are vestigial sideband transmission (VSB) which is used in television for economising bandwidth, while double sideband suppressed carrier (DSBSC) or single sideband suppressed carrier (SSBSC) provide further power or bandwidth economy. In particular, SSBSC is used extensively in multiplex coaxial systems for carrying several messages simultaneously. However the AM systems are essentially narrowband systems and suffer from limitations due to noise ...

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