A radio programme can be transmitted as an analogue signal or a digital signal. State what is meant by the terms analogue signal and digital signal.
Analogue signals transmit waves by changing the amplitude of the wave through a range of values. Digital signals only transmit at a single amplitude in short bursts.
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Television programmes can be transmitted through optical fibres using digital signals. Explain one advantage of using digital signals instead of analogue signals to transmit television programmes.
The signal can be regenerated so it can travel greater distances/ further without any degradation/ attenuations
Television programmes can be transmitted through optical fibres using digital signals. Explain another advantage of using digital signals instead of analogue signals to transmit television programmes
Noise can be removed from the signals/ less interference so that a clearer output is produced compared to an analogue signal.
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Give one limitation of using a digital signal
Bit depth and sample rate will affect loss of information.
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What is bit depth?
The amount of information in the sample and its affects the value that can be given to the amplitude per sample and so will affect the accuracy of the sample.
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What is sample rate?
The number of samples taken per second (frequency).
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Explain step 1 when converting an analogue signal to a digital signal
Use a transducer to produce an analogue electrical signal proportional to the signal you want to send.
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Explain step 2 when converting an analogue signal to a digital signal.
Connect the output of the transducer to the input of an analogue-to-digital converter.
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Explain step 3 when converting an analogue signal to a digital signal.
The cable must be screened by earthling to avoid electrical interference.
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Explain step 4 when converting an analogue signal to a digital signal.
Sample the analogue signal using the analogue-to-digital converter.
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Explain step 5 when converting an analogue signal to a digital signal.
Select an appropriate sampling rate, which sets how frequently the signal is taken.
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Explain step 6 when converting an analogue signal to a digital signal.
Select the smallest appropriate unit for converting the voltage signal into data.
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Explain step 7 when converting an analogue signal to a digital signal.
Transmit the data through an aerial or optical fibre.
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Explain how broadband may refer to any signal that contains multiple sets of information.
Most information is sent one piece of data at a time, while broadband can send a lot of data at once. This greatly improves the speed of data transfer. Broadband is most commonly used for internet access.
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Explain how broadband opticals fibres carry multiple signals at once.
The signals do not interfere with each because each signal is sent as a different frequency, or colour. The receiver only interprets a single frequency at a time, so only picks up one signal.
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Other cards in this set
Card 2
Front
Television programmes can be transmitted through optical fibres using digital signals. Explain one advantage of using digital signals instead of analogue signals to transmit television programmes.
Back
The signal can be regenerated so it can travel greater distances/ further without any degradation/ attenuations
Card 3
Front
What is the flow of analogue signals
Back
Card 4
Front
Television programmes can be transmitted through optical fibres using digital signals. Explain another advantage of using digital signals instead of analogue signals to transmit television programmes
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