What is the basic principle of generating DSB-SC AM signal?

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What is the basic principle of generating DSB-SC AM signal?

Double-sideband suppressed-carrier transmission (DSB-SC) is transmission in which frequencies produced by amplitude modulation (AM) are symmetrically spaced above and below the carrier frequency and the carrier level is reduced to the lowest practical level, ideally being completely suppressed.

What is the power of DSB-SC?

Power of DSBSC wave is equal to the sum of powers of upper sideband and lower sideband frequency components. First, let us find the powers of upper sideband and lower sideband one by one. Similarly, we will get the lower sideband power same as that of upper sideband power.

Why do we prefer DSB-SC than DSB FC?

The advantages of SSB-SC over DSB-FC signal are : Less bandwidth requirements . This allow more number of signals to be transmitted in the same frequency range . Lots of power saving .

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What is DSB-SC demodulation?

Advertisements. The process of extracting an original message signal from DSBSC wave is known as detection or demodulation of DSBSC. The following demodulators (detectors) are used for demodulating DSBSC wave.

What is the principle of working of a balanced modulator?

The principle of operation of a balanced modulator states that if two signals at different frequencies are passed through a “nonlinear resistance” then at the output we get an AM signal with suppressed carrier. The device having a nonlinear resistance can be diode or a JFET or even a bipolar transistor.

What is DSBSC demodulation?

What is the main advantage of DSBSC AM system?

Advantages of DSB-SC modulation It provides 100\% modulation efficiency. Due to suppression of carrier, it consumes less power. It provides a larger bandwidth.

What is a DSBSC modulator explain how the ring modulator for generation of DSBSC wave acts as a demodulator?

Explanation: Ring modulator is a product modulator used for DSB SC generation. It consists of four diodes connected in the form of ring. In AM , the ring modulator acts as a product modulator for a square wave carrier and modulating signal and generated a Double Side Band-Suppressed Carrier signal.

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What is the importance of Costas receiver?

Explanation: A Costa’s loop is based on phase-locked loop (PLL). The circuit recovers carrier frequency from the suppressed-carrier modulated signals like DSBSC and SSBSC and phase modulated signals like FSK and BFSK. It is generally used for coherent detection of AM-SC signal in receivers.

What is the difference between DSBSC and SSB SC?

DSB-SC stands for Double SideBand Suppressed Carrier and SSB-SC stands for Single SideBand Suppressed Carrier. As shown in the fig-2, at DSBSC transmitter, message signal (positive and negative) is modulated using carrier signal and added to suppress the carrier portion. This is referred as balanced modulator.

What is DSB modulation?

Double-sideband suppressed-carrier (DSB-SC) modulation is an amplitude modulation that consists only of the two symmetrical sidebands and no carrier band. I came across this scheme in an ultrasound application, where power utilization can be maximized when all power is available on the sidebands.

What is a DSB-SC scheme?

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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.

How do you generate a DSB-SC signal?

Generation of DSB-SC Signal A DSB-SC signal can be obtained by simply multiplying modulating signal x (t) with carrier signal cosω c t. So we need to use a device called product modulator for the generation of DSB-SC waves. Fig 1

What is a double sideband suppressed carrier (DSB-SC)?

Double Sideband Suppressed Carrier (DSB-SC) Modulation 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 D ouble S ideband S uppressed C arrier.

How is the DSB-SC wave calculated?

The DSB-SC wave s (t) is applied to a product modulator in which it is multiplied with the locally generated carrier cos (2πf c t) . We assume that this locally generated carrier is exactly coherent or synchronized in both frequency and phase with the original carrier wave c (t) used to generate the DSB-SC wave .