![The input to an envelope detector is a DSB-LC signal of the form (t) = A[1 + u cos 21 fmt] cos 2n fet where 0 <u < 1 and fc >](http://img.homeworklib.com/questions/214779c0-c1d0-11eb-95a7-1bb20424d528.png?x-oss-process=image/resize,w_560)
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The input to an envelope detector is a DSB-LC signal of the form (t) = A[1...
Problem 4 A DSB-LC signal o(t) = [A + f(t)]cos(w-t), with A=5, is the result of...
Problem 4 A DSB-LC signal o(t) = [A + f(t)]cos(w-t), with A=5, is the result of modulating f(t) = cos(W) + 2cos( 3mt), where a.) What is the modulation index? b) What is the modulation efficiency? c) What is the bandwidth of (t)? d) If before modulation, f(t) is multiplied by a gain c, what is the largest value of a such that an envelope detector may be used at the receiver.
Consider a DSB-LC system where the message signal is: and the modulated signal is: What is...
Consider a DSB-LC system where the message signal is:
and the modulated signal is:
What is the minimum value of the constant A for which the
envelope detector can be used to recover the message signal x(t)
form the modulated signal xm(t) without distortion?
I' stuck on this question could you please explain it?
We were unable to transcribe this imageWe were unable to transcribe this image
Exercise 7: R t Envelope Detector y(0 The circuit in the figure above is a good approximation to ...
Exercise 7: R t Envelope Detector y(0 The circuit in the figure above is a good approximation to an ideal differentiator demodulator if С 0.1 h, where fe is the carrier frequency of the FM signal and fr is the cut-off frequency of the RC high-pass filter. The input FM signal is given by the following. DrM(t) 4 cos[10 nt + 10 T (5 sin(10 mt))] a) b) Specify the value of the resistance R such that fe-0.1 h, when...
Problem A DSB-SC AM signal is modulated by the signal m(t) = cos(4000st) - cos(1000nt). The...
Problem A DSB-SC AM signal is modulated by the signal m(t) = cos(4000st) - cos(1000nt). The modulated signal is u(t) = 200 m(t) cos(21tfct), where f=1 MHz. 1. Determine and sketch the spectrum of the AM signal. 2. Determine the average power in the frequency components 3. Find a resonable choice of R and C to design an envelope detector for this DSB-SC AM signal.
4: An AM signal has the form s(t) = A (1 + il cos(mt) cos wet...
4: An AM signal has the form s(t) = A (1 + il cos(mt) cos wet with wm <we and u <1. The signal is to be demodulated using the simple envelope detector shown in the following plot. AM sinal (a) Sketch v.(t) when wm <1/RC <we (b) Comment on suitability of such an envelope detector for demodulating an amplitude modu- lated signal: (i) With both sideband and full carrier as in the AM radio system. (ii) With full carrier...
b) The figure below shows an FM demodulator. s'(t)Envelope detector Demodulated signal s(t) Differentiator Figure 4: Question 2(b) In the system above, the differentiator performs the time-differ...
b) The figure below shows an FM demodulator. s'(t)Envelope detector Demodulated signal s(t) Differentiator Figure 4: Question 2(b) In the system above, the differentiator performs the time-differentiation operation s'(t) = as(t). Also, the envelope detector is assumed to be ideal, capable of extracting the envelope of the incoming signal perfectly. Describe, by equations, how the above FM demodulator may exactly recover the message signal from the FM signal. (6%) (c) Is the FM demodulator in Question 2(b) a coherent detector,...
The input r(t) to a DSBSC receiver is a DSB signal s(t) = A m(t)cos (21fet)...
The input r(t) to a DSBSC receiver is a DSB signal s(t) = A m(t)cos (21fet) corrupted by additive white Gaussian noise with two-sided power spectral density N,/2, where No = 10-12 W/Hz, m(t) is a message signal bandlimited to 10 kHz. Average power of m(t) is Pm = 4 W and Ac = 2 mV. The block diagram of the receiver is shown below. Note that the receiver has filters which have slightly larger bandwidths than a typical DSB...
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...
1. Given a baseband signal m(t) sin(1000mt) cos(3000nt) + cos(3700nt a. Sketch the spectrum of m(...
1. Given a baseband signal m(t) sin(1000mt) cos(3000nt) + cos(3700nt a. Sketch the spectrum of m(t) (Hint. sin(a) cos(b) 0.5 sin(a +b) +0.5sin a-b)) b. Sketch the spectrum of DSB-CS signal m(t)cos(10000mt) C ldentify the upper sideband {USB) and lower sideband (LSB) spectra d. Give the black diagram of the receiver to receive DSB-CS signal in (b). 2. baseband signal m(r)--0.5 + Σ..小(t-n)-u(t-0.5-n)] where ult) is the Given unit step function, an amplitude modulated signal is as SAM 107+ m(0cos...
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.
Problem 4 A DSB-LC signal o(t) = [A + f(t)]cos(w-t), with A=5, is the result of modulating f(t) = cos(W) + 2cos( 3mt), where a.) What is the modulation index? b) What is the modulation efficiency? c) What is the bandwidth of (t)? d) If before modulation, f(t) is multiplied by a gain c, what is the largest value of a such that an envelope detector may be used at the receiver.
Consider a DSB-LC system where the message signal is:
and the modulated signal is:
What is the minimum value of the constant A for which the
envelope detector can be used to recover the message signal x(t)
form the modulated signal xm(t) without distortion?
I' stuck on this question could you please explain it?
We were unable to transcribe this imageWe were unable to transcribe this image
Exercise 7: R t Envelope Detector y(0 The circuit in the figure above is a good approximation to an ideal differentiator demodulator if С 0.1 h, where fe is the carrier frequency of the FM signal and fr is the cut-off frequency of the RC high-pass filter. The input FM signal is given by the following. DrM(t) 4 cos[10 nt + 10 T (5 sin(10 mt))] a) b) Specify the value of the resistance R such that fe-0.1 h, when...
Problem A DSB-SC AM signal is modulated by the signal m(t) = cos(4000st) - cos(1000nt). The modulated signal is u(t) = 200 m(t) cos(21tfct), where f=1 MHz. 1. Determine and sketch the spectrum of the AM signal. 2. Determine the average power in the frequency components 3. Find a resonable choice of R and C to design an envelope detector for this DSB-SC AM signal.
4: An AM signal has the form s(t) = A (1 + il cos(mt) cos wet with wm <we and u <1. The signal is to be demodulated using the simple envelope detector shown in the following plot. AM sinal (a) Sketch v.(t) when wm <1/RC <we (b) Comment on suitability of such an envelope detector for demodulating an amplitude modu- lated signal: (i) With both sideband and full carrier as in the AM radio system. (ii) With full carrier...
b) The figure below shows an FM demodulator. s'(t)Envelope detector Demodulated signal s(t) Differentiator Figure 4: Question 2(b) In the system above, the differentiator performs the time-differentiation operation s'(t) = as(t). Also, the envelope detector is assumed to be ideal, capable of extracting the envelope of the incoming signal perfectly. Describe, by equations, how the above FM demodulator may exactly recover the message signal from the FM signal. (6%) (c) Is the FM demodulator in Question 2(b) a coherent detector,...
The input r(t) to a DSBSC receiver is a DSB signal s(t) = A m(t)cos (21fet) corrupted by additive white Gaussian noise with two-sided power spectral density N,/2, where No = 10-12 W/Hz, m(t) is a message signal bandlimited to 10 kHz. Average power of m(t) is Pm = 4 W and Ac = 2 mV. The block diagram of the receiver is shown below. Note that the receiver has filters which have slightly larger bandwidths than a typical DSB...
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...
1. Given a baseband signal m(t) sin(1000mt) cos(3000nt) + cos(3700nt a. Sketch the spectrum of m(t) (Hint. sin(a) cos(b) 0.5 sin(a +b) +0.5sin a-b)) b. Sketch the spectrum of DSB-CS signal m(t)cos(10000mt) C ldentify the upper sideband {USB) and lower sideband (LSB) spectra d. Give the black diagram of the receiver to receive DSB-CS signal in (b). 2. baseband signal m(r)--0.5 + Σ..小(t-n)-u(t-0.5-n)] where ult) is the Given unit step function, an amplitude modulated signal is as SAM 107+ m(0cos...
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.
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