6. Explain step 4 when converting an analogue signal to a digital signal.
Sample the analogue signal using the analogue-to-digital converter.
Select the smallest appropriate unit for converting the voltage signal into data.
Transmit the data through an aerial or optical fibre.
The cable must be screened by earthling to avoid electrical interference.
7. Explain step 6 when converting an analogue signal to a digital signal.
The cable must be screened by earthling to avoid electrical interference.
Transmit the data through an aerial or optical fibre.
Select the smallest appropriate unit for converting the voltage signal into data.
Select an appropriate sampling rate, which sets how frequently the signal is taken.
8. 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.
Analogue signals transmit waves by changing the displacement of the wave through a range of values. Digital signals only transmit at a single amplitude in short bursts.
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.
The signal can be regenerated so it can travel greater distances/ further without any degradation/ attenuations
Bit depth and sample rate will affect loss of information
9. Explain step 7 when converting an analogue signal to a digital signal.
Select the smallest appropriate unit for converting the voltage signal into data.
The cable must be screened by earthling to avoid electrical interference.
Transmit the data through an aerial or optical fibre.
Select an appropriate sampling rate, which sets how frequently the signal is taken.
10. Explain step 2 when converting an analogue signal to a digital signal.
Sample the analogue signal using the analogue-to-digital converter.
Use a transducer to produce an analogue electrical signal proportional to the signal you want to send.
Connect the output of the transducer to the input of an analogue-to-digital converter.
The cable must be screened by earthling to avoid electrical interference.
11. 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.
Analogue signals transmit waves by changing the wavelength of the wave through a range of values. Digital signals only transmit at a single amplitude in short bursts.
Analogue signals transmit waves by changing the displacement of the wave through a range of values. Digital signals only transmit at a single amplitude in short bursts.
Analogue signals transmit waves by changing the time period of the wave through a range of values. Digital signals only transmit at a single amplitude in short bursts.
12. What is sample rate?
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.
Bit depth and sample rate will affect loss of information.
The number of samples taken per second (frequency).
Bit depth and sample rate will affect loss of connections.
13. 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.
the number of samples per second (frequency).
Bit depth and sample rate will affect loss of connections.
Bit depth and sample rate will affect loss of information.
14. Give one limitation of using a digital signal
Noise can be removed from the signals/ more interference so that a clearer output is produced compared to an analogue signal.
Interference can be removed from the signals/ more noise so that a clearer output is produced compared to a digital signal.
Bit depth and sample rate will affect loss of information.
Bit depth and sample rate will affect loss of connections.
15. Explain step 1 when converting an analogue signal to a digital signal
The cable must be screened by earthling to avoid electrical interference.
Use a transducer to produce an analogue electrical signal proportional to the signal you want to send.
Connect the output of the transducer to the input of an analogue-to-digital converter.
Sample the analogue signal using the analogue-to-digital converter.
