Xai Alexandrei Delos Reyes
問題数 29 • 10/17/2024
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問題一覧
1
is the process of converting raw message data into digital signals or waves over a modulator to optimize transmission. This process increases the strength of the signal to have maximum reach.
Modulation
2
is the steady waveform in terms of amplitude (height) and frequency
Carrier signal
3
it is the message that must be transmitted
Modulating Signal
4
is the output signal after the process.
Modulated Signal
5
One way to get a high-frequency signal to carry a low-frequency signal is by
Amplitude Modulation
6
It is a modulation process focused on modulating or changing the signal's amplitude.
Amplitude Modulation
7
are voltage or current variations that occur over time and are displayed on an oscilloscope screen
Time domain signals
8
During the modulation of a carrier wave by a modulating signal, new signals are generated at different frequencies as part of the process. These frequencies are called _____
Sidebands
9
Sideband signals are illustrated in a _________ where the horizontal axis represents frequency, and the vertical axis represents the signal’s magnitude, whether in voltage, current, or power amplitude.
Frequency domain
10
This is known as the ________, also referred to as the degree of modulation or modulating factor/coefficient.
modulation index
11
This is known as the ________, also referred to as the degree of modulation or modulating factor/coefficient.
modulation index
12
It can be used to derive the modulation index (𝑚) by measuring the values of the modulation and carrier voltages and then calculating the ratio.
oscilloscope
13
𝑽𝒎𝒂𝒙 is also known as
peak value
14
𝑽𝒎𝒊𝒏, the lowest, is also known as...
trough
15
AM means....
Amplitude Modulation
16
What is the formula for finding modulating index (𝑚)?
𝑉𝑚 / 𝑉𝑐 * 100
17
An imaginary line connects the positive and negative peaks of the carrier waveform. This imaginary line is called an ... ?
Envelope
18
A modulation process that puts the message in a carrier wave by changing the instantaneous frequency of the wave.
Frequency Modulation
19
It is the amount of change in the carrier frequency caused by the modulating signal. The maximum frequency deviation happens at the maximum amplitude of the modulating signal.
Frequency Deviation (𝒇𝒅)
20
The amount of shift depends on the amplitude of the binary signal. This modulation is called
frequency-shift keying
21
A modulation process wherein the phase of the carrier signal varies based on the amplitude variation of the message signal or modulating signal.
Phase Modulation
22
It starts to lead or compress at the second zero deviation until the next positive peak of the modulating signal. These are called _____?
lagging phase shifts and leading phase shifts
23
the signal does a 180°phase shift when it hits binary 1 or 0. The shift happens whether the signal is positive or negative. This process is called
phase-shift keying or binary phase-shift keying.
24
When a constant-frequency sine wave modulates a carrier, what is produced?
two side frequencies or sidebands
25
Which statement is NOT TRUE about Modulation
These are voltage or current variations that occur over time and are displayed on an oscilloscope screen.
26
Which statement is NOT TRUE about Sidebands
It is done to improve signals often unsuitable for the transmission device
27
Which statement is NOT TRUE about the characteristics of an Amplitude Modulation
The carrier frequency shifts proportionately as the modulating signal’s amplitude varies.
28
Which statement is NOT TRUE about the characteristics of an Frequency Modulation
An increase/decrease in the amplitude of the modulating signal causes an increase/decrease in the positive and negative peaks of the carrier amplitude.
29
Which statement is TRUE about Phase Modulation
A modulation process wherein the phase of the carrier signal varies based on the amplitude variation of the message signal or modulating signal.