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1. The system shown is used for scrambling audio signals. The output signal, y(t) is the...
4.2-9 The system shown in Fig. P4.2-9 is used for scrambling audio signals. The output yr)...
4.2-9 The system shown in Fig. P4.2-9 is used for scrambling audio signals. The output yr) is the scrambled version of the input m(1) (a) Find the spectrum of the scrambled signal y(t). (b) Suggest a method of descrambling y(t) to obtain m(t). Figure P.4.2-9 M ) m(1) v(1) Low-pass filter 0-15 kHz -(Scrambled output) - 15 kHz | 15 kHz f kHz 2 cos 30,000
Problem 1 A sinusodial signal x(t)- sin2t (t in seconds) is input to a system with frequency resp...
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...
1. Given the following AM rectifier detector circuit and its input and output signals: a t...
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.
8) For the modulated signal m(t)Cos(wt in the demodulation process to recover the original signal m( )which of the...
8) For the modulated signal m(t)Cos(wt in the demodulation process to recover the original signal m( )which of the following signals and filters will be used a. Sin(2wt), Low pass filter b. Cos(2wt), Band pass filter c. Cos(wt), Low pass filter d. Cos2 (wt), Band pass filter
8) For the modulated signal m(t)Cos(wt in the demodulation process to recover the original signal m( )which of the following signals and filters will be used a. Sin(2wt), Low pass filter b. Cos(2wt),...
When the message signal m (t) =cos (2π fmt) and the carrier signal is c(t)=cos (2π fct) , fm<&...
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...
The following periodic signal is input to an ideal low pass filter of bandwidth 25 KHz. 1. x(t) 2...
The following periodic signal is input to an ideal low pass filter of bandwidth 25 KHz. 1. x(t) 2 a) Determine the average power of the signal x(t). b) If T 0.1 ms, give the output of the filter as a function of time, y(t) e) Determine the average power of the signal y(t) d) Determine the bandwidth of the signal y(), considered as a baseband signal. e) Now assume that the signal x() (with T-0.1 ms) is instead input...
Q1) The spectrum of a signal m() is shown in Fig.Q1. This signal is ideally sampled...
Q1) The spectrum of a signal m() is shown in Fig.Q1. This signal is ideally sampled using train of impulses. MIn -3k 3 f Fig.Q1 a) Sketch the spectrum of the sampled signal gs() when i) f, = 7 kHz. ii) f, equals the Nyquist rate b) The sampled signal is passed through an ideal low-pass filter LPF which is band-limited to 3 kHz. Sketch the spectrum of the output signal for each of the three sampling rates given above.
Q1. A single-tone FM signal which can be expressed as, s(t) = 4, cos[2oft+ß sin(21f „t)]...
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...
4.4-6 An LSB signal is demodulated coherently, as shown in Fig. P4.4-6. Unfortunately, because of the...
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...
Q: One type of modulators is shown below: y(t) Rs 10 Bandpass filter von Vc(t) 1-...
Q: One type of modulators is shown below: y(t) Rs 10 Bandpass filter von Vc(t) 1- What is the name of this modulator, and what is it used for? 2- If m (-0.1 cos (2000 ) and Ve(t)=0.3 cos (40000 ) are the input of the diode, find the output of the diode if the input output characteristics of the diode is: Vo(t) = 0.3*Vi (t) + 0.2*Vi?(t) Then, find Vo(t), if the center frequency of the band pass filter...
4.2-9 The system shown in Fig. P4.2-9 is used for scrambling audio signals. The output yr) is the scrambled version of the input m(1) (a) Find the spectrum of the scrambled signal y(t). (b) Suggest a method of descrambling y(t) to obtain m(t). Figure P.4.2-9 M ) m(1) v(1) Low-pass filter 0-15 kHz -(Scrambled output) - 15 kHz | 15 kHz f kHz 2 cos 30,000
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...
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.
8) For the modulated signal m(t)Cos(wt in the demodulation process to recover the original signal m( )which of the following signals and filters will be used a. Sin(2wt), Low pass filter b. Cos(2wt), Band pass filter c. Cos(wt), Low pass filter d. Cos2 (wt), Band pass filter
8) For the modulated signal m(t)Cos(wt in the demodulation process to recover the original signal m( )which of the following signals and filters will be used a. Sin(2wt), Low pass filter b. Cos(2wt),...
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...
The following periodic signal is input to an ideal low pass filter of bandwidth 25 KHz. 1. x(t) 2 a) Determine the average power of the signal x(t). b) If T 0.1 ms, give the output of the filter as a function of time, y(t) e) Determine the average power of the signal y(t) d) Determine the bandwidth of the signal y(), considered as a baseband signal. e) Now assume that the signal x() (with T-0.1 ms) is instead input...
Q1) The spectrum of a signal m() is shown in Fig.Q1. This signal is ideally sampled using train of impulses. MIn -3k 3 f Fig.Q1 a) Sketch the spectrum of the sampled signal gs() when i) f, = 7 kHz. ii) f, equals the Nyquist rate b) The sampled signal is passed through an ideal low-pass filter LPF which is band-limited to 3 kHz. Sketch the spectrum of the output signal for each of the three sampling rates given above.
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...
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...
Q: One type of modulators is shown below: y(t) Rs 10 Bandpass filter von Vc(t) 1- What is the name of this modulator, and what is it used for? 2- If m (-0.1 cos (2000 ) and Ve(t)=0.3 cos (40000 ) are the input of the diode, find the output of the diode if the input output characteristics of the diode is: Vo(t) = 0.3*Vi (t) + 0.2*Vi?(t) Then, find Vo(t), if the center frequency of the band pass filter...
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