Double sideband suppressed carrier (dsb sc) modulation
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Double sideband suppressed carrier (dsb sc) modulation. Mathematical form Advantages Disadvantages Uses
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Single Sideband Suppressed Carrier (SSB-SC)
Single-sideband suppressed carrier (SSB-SC) modulation improves spectral efficiency by transmitting only one sideband. It requires a bandwidth equal to the signal bandwidth. SSB-SC can be detected coherently using multiplication by the carrier. Quadrature amplitude modulation (QAM) transmits two baseband signals over the same bandwidth using in-phase and quadrature carriers that are 90 degrees out of phase. Vestigial sideband (VSB) modulation is a compromise between DSB and SSB that inherits advantages of both while requiring only slightly greater bandwidth than SSB. It is used for broadcast television transmission.
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This document describes an experiment on double sideband suppressed carrier (DSB-SC) modulation and demodulation performed by electrical engineering students at the University of Asia Pacific. The objectives were to observe DSB-SC modulation using an MC1496 modulator and examine synchronous demodulation of DSB-SC signals. The experiment involved generating a message signal, carrier signal, and DSB-SC modulated signal. A balanced modulator was used to produce the DSB-SC signal. Synchronous demodulation using a balanced multiplier, low-pass filter, and same carrier signal as the modulator recovered the original message signal from the DSB-SC signal. The students observed input and output waveforms and discussed the circuit connections and results
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Single-sideband suppressed carrier (SSB-SC) modulation improves spectral efficiency by transmitting only one sideband. It requires a bandwidth equal to the signal bandwidth. SSB-SC can be detected coherently using multiplication by the carrier. Quadrature amplitude modulation (QAM) transmits two baseband signals over the same bandwidth using in-phase and quadrature carriers that are 90 degrees out of phase. Vestigial sideband (VSB) modulation is a compromise between DSB and SSB that inherits advantages of both while requiring only slightly greater bandwidth than SSB. It is used for broadcast television transmission.
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This document describes an experiment on double sideband suppressed carrier (DSB-SC) modulation and demodulation performed by electrical engineering students at the University of Asia Pacific. The objectives were to observe DSB-SC modulation using an MC1496 modulator and examine synchronous demodulation of DSB-SC signals. The experiment involved generating a message signal, carrier signal, and DSB-SC modulated signal. A balanced modulator was used to produce the DSB-SC signal. Synchronous demodulation using a balanced multiplier, low-pass filter, and same carrier signal as the modulator recovered the original message signal from the DSB-SC signal. The students observed input and output waveforms and discussed the circuit connections and results
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There are different types of modulation including analogue modulation (AM, FM, PM), pulse modulation, and digital modulation. Amplitude modulation (AM) varies the amplitude of the carrier wave and produces sidebands at sums and differences of the carrier and modulating frequencies. Double sideband suppressed carrier (DSB-SC) modulation suppresses the carrier wave to improve power efficiency but requires a complex receiver for demodulation.
Modulation
Digital modulation techniques change aspects of a carrier signal to transmit information. This document discusses various digital modulation methods including:
- Amplitude modulation (AM) which varies the amplitude (A) of the carrier.
- Frequency modulation (FM) which varies the frequency (ω) of the carrier.
- Phase modulation (PM) which varies the phase (φ) of the carrier.
It then discusses specific modulation techniques including amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK) and their variants like quadrature phase shift keying (QPSK). The document provides illustrations of the modulated signals and discusses their bandwidth efficiency and performance in noise.
Amplitude Modulation (AM)
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Double sideband suppressed carrier (dsb sc) modulation
- 2. PRESENTER: Hassan ijaz Quaid I Azam University Islamabad
- 3. DEFINITION: • DSB-SC is an amplitude modulated wave transmission scheme in which only sidebands are transmitted and the carrier is not transmitted as it gets suppressed. DSB-SC is an acronym for Double Sideband Suppressed Carrier.
- 4. GENERATION OF DSB-SC SIGNAL
- 5. CONTINUE • observing the figure, we can say that a product modulator generates a DSB-SC signal. • The signal is obtained by the multiplication of baseband signal x(t) with carrier signal cos ωct
- 6. FREQUENCY SHIFTING PROPERTY OF FOURIER TRANSFORM- From the above equation, it is clear that only 2 components are present in the spectrum. These two are the two sidebands that are placed at +ωc and -ωc.
- 7. MATHEMATICAL EXPRESSION • In order to get an exact an idea about the suppression of carrier in DSB-SC system. • Consider the baseband or modulating signal, • x(t) = Ax cos (2πfxt) • and the carrier signal, • c(t) = Ac cos (2πfct)
- 8. CONTINUE The mathematical representation of the signal at the output of the product modulator is given as- s(t) = x(t).c(t) Further, The maximum frequency is fc + fx The minimum frequency is fc – fx
- 9. ADVANTAGES • of DSB-SC modulation 1.It provides 100% modulation efficiency. 2.Due to suppression of carrier, it consumes less power. 3.It provides a larger bandwidth.
- 10. DISADVANTAGES • of DSB-SC modulation 1.It involves a complex detection process. 2.Using this technique it is sometimes difficult to recover the signal at the receiver. 3.It is an expensive technique when it comes to demodulation of the sign
- 11. APPLICATIONS OF DSB-SC MODULATION 1.During the transmission of binary data, DSB-SC system is used in phase shift keying methods. 2.In order to transmit 2 channel stereo signals, DSB signals are used in Television and FM broadcasting. • DSB-SC technique allows us to have a transmission that reduces overall power consumption rate, thereby ensuring a stronger signal at the output.