Double sideband (DSB) refers to a modulation technique where the upper and lower sidebands of a modulated signal are transmitted along with the carrier signal. This results in a signal that occupies a bandwidth equal to twice the bandwidth of the modulation signal. DSB modulation is simple but inefficient in terms of spectrum usage because it transmits redundant information in both sidebands.
Single sideband (SSB) and double sideband (DSB) are modulation techniques used in radio communications.
DSB modulation involves transmitting both the upper and lower sidebands of the modulated signal, as well as the carrier. This results in a signal that occupies a wider bandwidth compared to SSB modulation. In contrast, SSB modulation transmits only one of the sidebands (upper or lower) with the carrier, while suppressing the opposite sideband and the carrier itself.
This technique is more bandwidth efficient than DSB modulation because it uses half of the spectrum required for DSB while carrying the same information.
DSB AM (double sideband amplitude modulation) is a type of amplitude modulation where the upper and lower sidebands of the modulated signal are transmitted, along with the carrier. This results in a signal that contains the original baseband signal duplicated in both sidebands around the carrier frequency.
DSB AM is simple to implement but occupies twice the bandwidth compared to SSB AM (single sideband amplitude modulation), which transmits a single sideband and the aircraft carrier.
DSB-SC (double sideband carrier) and SSB-SC (single sideband carrier) are modulation techniques where the carrier signal is removed after modulation. DSB-SC modulates the message signal on a carrier wave by transmitting the upper and lower sidebands, while completely suppressing the carrier.
SSB-SC, on the other hand, transmits a single sideband (upper or lower) with the carrier, while suppressing the opposite sideband and the carrier itself. SSB-SC is more band efficient than DSB-SC because it uses half the spectrum required for DSB-SC while transmitting the same information.
The difference between double sideband (DSB) and AM (amplitude modulation) is their scope and purpose. DSB refers specifically to a modulation technique where the upper and lower sidebands are transmitted with the carrier, resulting in a signal that occupies a bandwidth twice that of the modulating signal.
AM, on the other hand, is a broader term that encompasses various modulation techniques where the amplitude of a carrier signal is varied in accordance with the instantaneous amplitude of a modulating signal (usually a voice or data signal). AM can include both DSB AM (double sideband amplitude modulation) and SSB AM (single sideband amplitude modulation), where SSB AM is more band efficient than DSB AM due to the transmission of ‘a single sideband and carrier