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Recent questions tagged amplitude-modulation
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GATE ECE 2019 | Question: 46
A voice signal $m(t)$ is in the frequency range $5\:kHz$ to $15\:kHz$. The signal is amplitude-modulated to generated an AM signal $f(t)=A\left(1+m(t)\right)\cos 2\pi f_{c}t,$ where $f_{c}=600\: kHz.$ ... for the encoding. The rate, in Megabits per second (rounded off to $2$ decimal places), of the resulting stream of coded bits is ________ Mbps.
Arjun
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Communications
Feb 12, 2019
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Arjun
6.0k
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109
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gate2019-ec
numerical-answers
communications
amplitude-modulation
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0
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2
GATE ECE 2014 Set 4 | Question: 23
In a double side-band (DSB) full carrier AM transmission system, if the modulation index is doubled, then the ratio of total sideband power to the carrier power increases by a factor of __________.
Milicevic3306
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Communications
Mar 26, 2018
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Milicevic3306
15.8k
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39
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gate2014-ec-4
numerical-answers
communications
amplitude-modulation
0
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0
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3
GATE ECE 2014 Set 2 | Question: 23
Consider sinusoidal modulation in an AM system. Assuming no overmodulation, the modulation index ($\mu$) when the maximum and minimum values of the envelope, respectively, are $3$ V and $1$ V, is ___________.
Milicevic3306
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Communications
Mar 26, 2018
by
Milicevic3306
15.8k
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79
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gate2014-ec-2
numerical-answers
communications
amplitude-modulation
0
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0
answers
4
GATE ECE 2018 | Question: 27
Let $c\left ( t \right )=A_{c} \cos \left ( 2\pi f_{c}t\right )$ and $m\left ( t \right )=\cos \left ( 2\pi f_{m}t\right )$. It is given that $f_{c}>> 5f_{m}.$ The signal $c\left ( t \right )+m\left ( t \right )$ is applied to ... wave. If it is desired to have the sideband power of the AM wave to be half of the carrier power, then $a/b$ is $0.25$ $0.5$ $1$ $2$
gatecse
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Communications
Feb 19, 2018
by
gatecse
1.5k
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50
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gate2018-ec
communications
amplitude-modulation
0
votes
2
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5
GATE ECE 2018 | Question: 15
Consider the following amplitude modulated signal: $s\left ( t \right )=\cos\left ( 2000\:\pi t \right )+4\cos\left ( 2400\:\pi t \right )+ \cos\left ( 2800\:\pi t \right ).$The ratio (accurate to three decimal places) of the power of the message signal to the power of the carrier signal is _________.
gatecse
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Communications
Feb 19, 2018
by
gatecse
1.5k
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166
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gate2018-ec
numerical-answers
communications
amplitude-modulation
0
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0
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6
GATE ECE 2017 Set 2 | Question: 50
The unmodulated carrier power in an AM transmitter is $5$ kW. This carrier is modulated by a sinusoidal modulating signal. The maximum percentage of modulation is $50 \%$. If it is reduced to $40 \%$, then the maximum unmodulated carrier power (in kW) that can be used without overloading the transmitter is _________
admin
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Communications
Nov 25, 2017
by
admin
32.7k
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151
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gate2017-ec-2
amplitude-modulation
numerical-answers
communications
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