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A portion in a communications system, which processes the information so that it will become suitable to the characteristic of the transmission medium
Signal whose physical quantity varies continuously with time
Digital information is processed with a specified degree of
Indicate the voltage level in dB with reference to one volt. This unit is used in video or TV measurement
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When the power ratio of the output to input of a circuit is 200. What is the gain in dB?
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What is the reference level for random noise measurement, FIA weighted?
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A 10 db pad has an output level of -3dBm. What is the level at the input?
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A power level of 50 µW could be expressed as:
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Study Notes
Communication System Components
- A modem is a portion in a communications system that processes information to make it suitable for transmission through a specific medium.
Signal Types
- Analogue signals are signals whose physical quantity varies continuously with time.
Digital Information Processing
- Digital information is processed with a specified degree of precision.
Measurement Units
- dBV (decibel volts) is a unit used to indicate the voltage level in dB with reference to one volt, commonly used in video or TV measurement.
Gain Measurement
- When the power ratio of the output to input of a circuit is 200, the gain in dB is 23 dB.
Noise Measurement
- The reference level for random noise measurement is 1 pW (picowatt), FIA weighted.
Attenuation Pads
- A 10 dB pad has an output level of -3 dBm, meaning the input level would be 7 dBm.
Power Level Expressions
- A power level of 50 µW (microwatts) could be expressed as 17 dBm or -12 dBW.
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Description
Test your knowledge of communication system signal processing with questions about voltage level in dB, gain calculation, reference level for random noise measurement, and processing digital information for transmission.
