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double sideband (DSB)

In amplitude modulation, a carrier signal is mixed with a modulation signal or a frequency band. Technically, the mixing takes place at a non-linear characteristic

. During mixing, two frequency bands are created below and above the carrier frequency, which contain the same information. These two frequency bands are called the lower and upper sideband, lower sideband (LSB) and upper sideband (USB). Hence the name

double sideband modulation (ZSB) or double sided bands (DSB).

Principle of Double Sideband Modulation

Principle of Double Sideband Modulation

The example shows a frequency band from 2 kHz to 20 kHz modulated onto a carrier frequency of 1 MHz.

Thelower sideband is between 980 kHz and 998 kHz, the upper sideband between 1.002 MHz and 1,020 MHz, with the carrier signal of 1 MHz in between.

If one sideband is filtered out, a single sideband modulation is obtained.

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Englisch: double sideband - DSB
Updated at: 28.12.2011
#Words: 186
Translations: DE