Vestigial type modulation (VSB) is achieved by modifying amplitude modulation (AM) to improve the efficiency of bandwidth usage, particularly in digital television broadcasting. It involves filtering the transmitted signal to eliminate one sideband and part of the carrier, which reduces bandwidth while preserving the ability to recover the original signal at the receiver. This technique helps in minimizing interference and allows for more efficient spectrum utilization. VSB is commonly used in ATSC (Advanced Television Systems Committee) standards for digital TV transmission.
Pulse-Amplitude Modulation
depends on type of modulation and other variables
the modulation system is of FM
QAM is a combination of phase modulation & amplitude modulation.
Frequency modulation Phase modulation
Analog tv broadcast systems
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 . Portions of one of the redundant sidebands are removed to form a vestigial sideband signal - so-called because a vestige of the sideband remains.
It is a type of Pulse modulation as in PPM the position of pulse of carrier pulse train is varied in accordance with the modulating signal.
The word 'vestigial' means not fully developed in mature animals Vestigial is a small remnant of something that was once much larger.
A vestigial organ is an organ that has no beneficial use to an organism. Ex. Tail bone in Humans
Analog modulationIn analog modulation, the modulation is applied continuously in response to the analog information signal.Common analog modulation techniques are:Amplitude modulation (AM) (here the amplitude of the modulated signal is varied) Double-sideband modulation (DSB) Double-sideband modulation with unsuppressed carrier (DSB-WC) (used on the AM radio broadcasting band)Double-sideband suppressed-carrier transmission (DSB-SC)Double-sideband reduced carrier transmission (DSB-RC)Single-sideband modulation (SSB, or SSB-AM), SSB with carrier (SSB-WC)SSB suppressed carrier modulation (SSB-SC)Vestigial sideband modulation (VSB, or VSB-AM)Quadrature amplitude modulation (QAM)Angle modulation Frequency modulation (FM) (here the frequency of the modulated signal is varied)Phase modulation (PM) (here the phase shift of the modulated signal is varied)
Vestigial wings.
Vestigial SideBand. It is a type of signal modulation (filtering) used in the television communication industry. It is used to help remove signal redundancy in Pulse Amplitude Modulated (PAM) signals. Also look up 8VSB and A-VSB which are variants of VSB.
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PPM is a type of pulse modulation where messages are sent using single pulses. PWM is a type of modulation which conforms to the pulse. PAM is a type of modulation in which the information is encoded into a series of pulses.
A.Vestigial :)
Pulse-Amplitude Modulation