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Analog And Digital Electronics > Lesson 1 > Flashcards

Lesson 1 Flashcards

1
Q

Which device can transmit and receive EM Waves?

A

Antenna

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2
Q

What is the range of audio signal frequency?

A

20 Hz to 20 kHz

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3
Q

What is any specific range of frequency of audio signal called?

A

Audio intelligence peak

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4
Q

What is base band signal?

A

0.3 kHz to 4 kHz

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5
Q

What is the formula for antenna height?

A

Lambda/10

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6
Q

Define modulation

A

The process by which high frequency signals will follow the characteristics of low frequency signals is called modulation

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7
Q

What are the 3 types of modulation?

A

Amplitude Modulation
Frequency Modulation
Phase Modulation

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8
Q

Which filter used at transmitter section?

A

Band pass filter

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9
Q

Which filter is used at receiving section?

A

Low pass filter

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10
Q

Frequency is very low for which signal

A

Modulating signal

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11
Q

Frequency is very high for which which signal

A

Modulated signal

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12
Q

What does AWGN stand for?

A

Additive White Gaussian Noise

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13
Q

Why is AWGN called additive?

A

It is added with amplitude of the signal

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14
Q

Expand PSD

A

Power Spectral Display

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15
Q

Expand ESD

A

Energy Spectral Density

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16
Q

Expand SNR

A

Signal to Noise Ratio

17
Q

In a radio what is the components used in tuning or modulation?

A

An inductor and capacitor

18
Q

Which component on a tuning radio is easily changed ?

A

Capacitor

19
Q

What is used to change the capacitance?

A

VariCap- Variable Capacitor

20
Q

After varying the capacitance , what are the steps till a person can hear the sound?

A

Signal amplified
|
Mixer to mix received frequency and high frequency
|
Intermediate frequency amplifier
|
Demodulator
|
Audio Frequency Amplifier to retrieve the audio
|
Speaker to hear

21
Q

What is the information essentially known as?

A

Modulating signal or Baseband signal

22
Q

What is modulated signal?

A

Modulating signal + very fast high frequency carrier

23
Q

What is demodulation?

A

Separation of modulating signal from high frequency carrier is known as demodulation

Analog And Digital Electronics (1 decks)

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