Ch 1 - P 1 - Analog Signals Flashcards
What is the most fundamental concept of an analog signal?
Sinusoid
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Name the 3 parameters used to describe a sinusoid.
- Amplitude
- Frequency
- Phase
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What is the standard unit of frequency measurement?
Hertz (Hz)
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What formula is used to represent the relationship between cycle time and frequency?
f = 1/T
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What is the typical range of frequencies that humans can hear?
20 Hz to 20,000 HZ
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What range of frequencies is typically used for voice telephone circuits?
300 Hz to 3,400 Hz
What is a phase?
A description of the reference time, t = 0
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How many degrees are in a cycle?
360 degrees TDMM: page 1-19
What is the signal’s spectrum?
A sum of sinusoidal signals that differ in amplitude, frequency, and phase?
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What is necessary for the received signal to be an exact duplicate of the transmitted signal?
The transmission system must not change the frequency of any signal components, and the relative amplitude and phases of all components must be maintained.
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What defines the analog signal’s bandwidth?
The frequency range of the sinusoidal signals needed to describe an analog signal.
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What is the frequency range of the very low frequency (VLF) band?
3 to 30 kHZ
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What is the frequency range of the low frequency (LF) band?
30 to 300 kHz
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What is the frequency range of the medium frequency (MF) band?
300 to 3000 kHz
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What is the frequency range of the high frequency (HF) band?
3 to 30MHz
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What is the frequency range of the very high frequency (VHF) band?
30 to 300 MHz
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What is the frequency range of the ultra high frequency (UHF) band?
300 to 3000 MHz
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What is the frequency range of the community antenna TV (CATV) band?
54 to 1002 MHz
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What is the frequency range of the super high frequency (SHF) band?
3 to 30 GHz
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What is the frequency range of the extremely high frequency (EHF) band?
30 to 300 GHz
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What unit of measure is often used to express the strength of a signal?
Decibel (dB)
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What dB change occurs when the power is doubled?
+3 dB
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What dB change occurs when the power is reduced by half?
-3 dB
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Decibel levels are used to express power rations of types of analog, digital signals, regardless of the medium.
True. Decibel levels are used to express power rations of all types of analog and digital signals, regardless of the medium.
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