This set of Analog Communications Multiple Choice Questions & Answers (MCQs ) focuses on “Generation of DSBSC Waves”. 1. LCD uses. Page 1. Lecture Generation of DSBSC waves: balanced modulator, ring modulator. Page 2. Page 3. Double-sideband suppressed-carrier transmission (DSB-SC) is transmission in which In the DSB-SC modulation, unlike in AM, the wave carrier is not transmitted; .. A DSBSC generation and demodulation instrument is described as side.
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The equation above shows that by multiplying the modulated signal by the carrier signal, the result is a scaled version of the original message signal plus a second term. DSB-SC transmission is a special case of double-sideband reduced carrier transmission. Explain its generation using balanced modulator. Comments and Ratings 1. Choose a web site to get translated content where available and see local events and offers. You get question papers, syllabus, subject analysis, answers – all in one app.
Esbsc 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.
Analog Communication DSBSC Modulators
This resultant signal is then passed dsbsf a low pass filter to produce a scaled version of original message signal. Download our mobile app lf study on-the-go.
The DSBSC generation using balanced modulator based on nonlinear resistance characteristics of diode is given below in Fig1. Geneartion AM consists of the two sidebands and a carrier where the major transmitted power is concentrated in the carrier which contains no information.
Once this signal passes through a low pass filter, the higher frequency component is removed, leaving just the original message. The name “suppressed carrier” comes about because the carrier signal component is suppressed—it does not genegation in the output signal.
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The mathematical fo of this process is shown below, where the product-to-sum trigonometric identity is used. Full depth modulation requires carrier re-insertion. Based on your location, we recommend that you select: Select the China site in Chinese or English for best site performance.
Below is a message signal that one may wish to modulate onto a carrier, consisting of a couple of sinusoidal components with frequencies respectively Hz and Hz. The above equation shows that carrier has been cancelled outleaving only two sidebands and the modulating frequencies. This is best shown graphically. This is apparent when the spectrum of the output signal is viewed.
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The output of the balanced modulator contains two sidebands and sum of the harmonic components. The modulating frequencies from the output is eliminated by the tuning of the output transformer, which results in the below equation of the generated DSBSC wave.
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Demodulation is done by multiplying the DSB-SC signal with the carrier signal just like the modulation process. This file generates the amplitude modulated signal and DSBSC wave for given carrier wave frequency, message signal frequency and modulation Index.
Retrieved from ” https: Double Sideband Suppressed Carrier DSBSC is an amplitude modulation technique in which the modulated wave gdneration both the sidebands along with the suppressed carrier.
Analog Communication – DSBSC Modulators
Amplitude modulation AM is a modulation technique used in electronic communication. The diode in the balanced modulator use the nonlinear resistance property for producing ddbsc signals. In the picture shown below we see four peaks, the two peaks below Hz are the lower sideband LSB and the two peaks above Hz are the upper sideband USBbut there is no peak at the Hz mark, which is the frequency of the suppressed carrier. The modulated wavws currents of the two diodes are combined in the center tapped primary of the output transformer, which then gets subtracted.
This consists of a message signal multiplied by a carrier signal.