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4.2-9 The system shown in Fig. P4.2-9 is used for scrambling audio signals. The output yr)...
1. The system shown is used for scrambling audio signals. The output signal, y(t) is the scrambled version of the input m(t). Find the spectrum of the scrambled signal y(t): Y(f) Mf) m(t) vt) Low-pass filter 0-15 kHz - (Scrambled output) - 15 kHz | 15 kHz f kHz 2 cos 30,000 t
4.4-6 An LSB signal is demodulated coherently, as shown in Fig. P4.4-6. Unfortunately, because of the transmission delay, the received signal carrier is not 2 cos Wet as sent, but rather, is 2 cos[wc + Aw)t + 8). The local oscillator is still cos wct. Show the following. (a) When 8 = 0, the output y(t) is the signal m(t) with all its spectral components shifted (offset) by Ao. Hint: Observe that the output y(t) is identical to the right-hand...
1. Given the following AM rectifier detector circuit and its input and output signals: a t m()] cos RIr) LA + m(o) ? m(1) Low-pass A + m()) cos m(t) a. [40 points] Find Va(t), the modulated input signal into the low-pass filter. b. [10 points] Show that (1/T)m(t) is the signal across the output resistor R.
Mark with an X, the best answer for each statement below. Show your reasoning 9. EXTRA CREDIT: The ac circuit in Fig. 9(a), with the output VouT, acts as a: [2 points extra credit] a. 12 F Vin (t) 6 S2 low-pass filter (see Table Vourl t) band-pass filter (see Table) band-stop filter (see Table) high-pass filter (see Table) 12 H iv. V. Fig. 9 (a) _ None of the above Table: Filter Definitions Pass Stop Low-Pass b. For the...
Problem 1 A sinusodial signal x(t)- sin2t (t in seconds) is input to a system with frequency response: H(G What signal y(t) is observed at the output? Problem 2 The inverse Fourier transform of a system frequency response is given by h(t)t. The signal x(t) 3 cos(4t 0.5) is input to the system (t in seconds). (a) What is the expression of the signal y(t) at the system output? (b) What is the power attenuation in dB caused by the...
(2) Find the output of the DSB-SC demodulator shown in Fig.Q2 below, if the local oscillator at the receiver has a phase difference of $ . Also find the power of the signal v,(t) Product modulator (mixer) DSB-SC Modulated Signal vít) Low-Pass Filter Demodulated Signal v.(t) s(t)= m(t)4, cos(21f1) cos (21 f1+0) Local Oscillator Fig. 22
Q1. A single-tone FM signal which can be expressed as, s(t) = 4, cos[2oft+ß sin(21f „t)] is applied to a square-law device with output voltage v2 related to input voltage vi by vz(t)= av (t) where a is a constant. a. Determine analytic expression of the output signal. b. Explain how such a device can be used to obtain an FM signal with a greater frequency deviation (Af) than that available at the input. Q2. The spectrum of a message...
1. (50pt) NOTE: To get full mark, you are required to: (1) Plot sampled signals and fitered signals in the frequency domain, (e) Provide solution in time domain and (3 Provide the reasoning. HINT: Take notice on the height of the low pass filter for correct solutions A signal r(t)-cos(3rt) is sampled at a rate of f, samples per second. The sampled signal is then passed through an ideal low pass filter (LPF) with a cutoff frequency at 2 Hz...
number 2 ECE 300 Continuous-Time Signals and Systems H(jø π/2 Plot the spectrum Z (jø) of the filtered input signal z(), the spectrum Z, (jo) of the sampled signal z.(t), and the spectrum Y(ja) of the reconstructed signal y(t). Show clearly how the output spectrum Y (ja) differs from the original spectrum G(jo) C. Which system, A or B, produces less distortion between the input g(t) and the output y(4) or ()? Explain. You can measure distortion by finding the...
When the message signal m (t) =cos (2π fmt) and the carrier signal is c(t)=cos (2π fct) , fm<< fc, The modulated DSB-SC signal SDSB-SC=m(t)cos(2πfct) is generated, and only the upper sideband To generate and transmit the SSB signal. As shown in the figure below, the receiver is a local oscillator cosine signal to the received signal and passes it through a low-pass filter. Answer the following questions. (a) Draw the waveform of DSB-SC modulated signal SDSB-SC(t) (b)Find the result...