Question No 2 and No 3 A. DSB-SC Amplitude Modulator 1. Create a new model windo

Question

Question No 2 and No 3

A. DSB-SC Amplitude Modulator 1. Create a new model window by clic king the Create a new model button on the Library Browser toolbar or click File>>New>Model. * A new empty workspace window is opened Develop a Simulink model for double sideband suppressed carrier (DSB-SC) amplitude 2. modulator whose output is described by ) = cos(2nfmt) oubie Messge signa 1 Hz Mutpier Gain DSD-AM Modulator Wavetoms DSB-SC AM Modulator cin) Carrier signa 10 Hz The library location for each of the block are as follows: Sine Wave block Product block Gain block Scope block Sources library of DSP System Toolbox - Commonly Used Blocks library of Simulink Toolbox - Commonly Used Blocks library of Simulink Toolbox . . - Sinks of Simulink Toolbox 3. Use the explicit values given in the model to set the parameters setting for each block. Run the simulation. Modulating signal: Frequency 1Hz, amp IV (2V p-p).phase offset 0.5*pi, sample time 1/100 and leave the rest of the parameters as they first appeared. Carrier signal: Frequency 10Hz, amp 10V (20V p-p), phase offset 0.5*pi, sample time 1/1000 and leave the rest of the parameters as they first appeared 4. The expected output would be:

Explanation / Answer

2.

The sine wave block generally gives us a continous time sine signal . during sampling we mean that to consider only some values at discrete intervals of time . so the theorem is to convert continous time waveform to discrete time waveform.

steps are

1. put t (in continous time formula ) = N (discrete variable) * TS (sampling frequency)

= (N / fs)

2. now by entering the value of sample (N) u can get the appropriate value .

3. Amplitude modulation is the process of multiplying two signals . (message and carrier ) . so we create two signals and then use the multiply block to multiply them and we have to also multiply this signal by a constant gain so we use a gain block and the output signal of the gain block is a AM modulated wave.

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