What is VSB Modulation technique?
Definition. Vestigial Sideband Modulation (VSB) refers to the process where the “vestige” part of a signal is modulated alongside one sideband. A vestigial sideband is a form of amplitude modulation (AM) that encodes data in a signal by altering the amplitude of the carrier frequency.
What is a VSB carrier system?
Vestigial sideband (VSB) is a type of amplitude modulation ( AM ) technique (sometimes called VSB-AM ) that encodes data by varying the amplitude of a single carrier frequency . The actual information is transmitted in the sidebands, rather than the carrier; both sidebands carry the same information.
What is the application of VSB?
VSB Modulation Applications VSB modulation is standard for the transmission of TV signals. Because the video signals require a large transmission BW using the techniques like DSB-FC otherwise DSF-SC. This is a type amplitude modulation that is mainly used for the TV broadcast worldwide.
Why is VSB modulation used in TV transmission?
A guard band of very small width is laid on either side of VSB in order to avoid the interferences. This VSB modulation is mostly used in television transmissions. The transmission bandwidth of VSB modulated wave will be the total of message bandwidth and the width of vestigial sideband.
Why do we go for VSB modulation?
VSB Modulation − Advantages Highly efficient. Reduction in bandwidth. Filter design is easy as high accuracy is not needed. The transmission of low frequency components is possible, without difficulty.
How is VSB generated?
Generation of Vestigial sideband (VSB) modulated wave. Here, from the above figure, it is clear that a VSB signal is generated at the output of the sideband filter employed in the circuit. The filter is designed such that it transmits one sideband including vestige (some part) of the other. Thus producing a VSB signal.
What are the advantages of VSB AM?
Advantages of VSB The main advantage of VSB modulation is the reduction in bandwidth. It is almost as efficient as the SSB . Due to allowance of transmitting a part of lower sideband, the constraint on the filter have been relaxed . So practically, easy to design filters can be used .
What is VSB modulation?
This VSB modulation is mostly used in television transmissions. The transmission bandwidth of VSB modulated wave will be the total of message bandwidth and the width of vestigial sideband. Two guard bands are laid on both the sides of this VSB signal so as to avoid the interference of signals.
What is vestigial sideband VSB modulation?
A guard band of very small width is laid on either side of VSB in order to avoid the interferences. This VSB modulation is mostly used in television transmissions. The transmission bandwidth of VSB modulated wave will be the total of message bandwidth and the width of vestigial sideband.
What is a VSB signal?
A VSB signal is designed like the following image. In conjunction with the higher sideband, a fraction of the lesser sideband is also being broadcasted in this method. An extremely small size protector band is laid on any side of vestigial sideband for avoiding the intrusions. This modulation is frequently used in TV transmissions.
What is the bandwidth required for DSB-SC modulation?
Since a bandwidth of video signal is 4.2 MHz and we have already discussed in DSB-SC modulation that it requires bandwidth twice that of the message signal. Hence in case of DSB system, the required bandwidth will become 8.4 MHz i.e., twice the bandwidth of the video signal.