Crowdly

Calculate

the total power in the sidebands of a Double-sideband Amplitude Modulation

(DSB-AM) system, given a modulation index of 𝑚 = 0.5 and a carrier power,

𝑃

_𝐶

1 kW.

62.5 kW

1125

1.125

125 kW

input signal of the form cos(2pi

f₀t

) will come out of an LTIV system

as:

2cos(2pi(f₀+theta)t)

a triangular wave

sin(2pif₀t) + cos(2pif₀t)

cos(2pi(f₀+ f₁)t)

What

is the range of normalised frequency in the primary period?

-2 to 2

-10,000

to 10,000

Which

of the following choices best describes the function of the filter given below?

a lowpass filter

a bandpass filter

a bandstop filter

a highpass filter

They are very easy to design.

Which of

the following is a characteristic of an LTIV (Linear Time Invariant) system?

They

are nonlinear systems.

They

are always very cost-effective.

They

do not produce new frequency content.

Which

of the following values falls in the range of landline telephone band frequencies?

DSB-SC Amplitude Modulation, what is the main advantage of suppressing the

carrier?

it saves bandwidth.

improves performance.

makes no difference, hence no advantage.

saves power at the transmitter due to not transmitting the carrier information.

AM demodulation, what are the two pieces of hardware that are needed to recover

the original message signal?

rectifier followed by a LPF

rectifier followed by a BPF

LPF followed by a BSF

LPF followed by a rectifier

Double-Sideband Amplitude Modulation (DSB-AM), what happens to the baseband

spectrum after the message is modulated?

it is multiplied by the sinusoid.

it is multiplied by the carrier

frequency.

is shifted to the carrier frequency, symmetrically about d.c.

none of the above.