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4 Cards in this Set
- Front
- Back
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State whether these are analog or digital signals: Humidity reading in greenhouse State of a lightswitch Number of customers visiting a shop every 5 mins |
Analog- continuous in both value and time Digital - either on or off Digital - whole numbered values with fixed sample rate |
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State 2 ways the information can be lost when converting an analog signal to digital |
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If the highest frequency in a signal is 5kHz, what frequency would you sample at to avoid problems with aliasing |
You should use sampling at 10 kHz |
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If we had an MP3 audio file samples at 44.1kHz and using 16 bit quantisation, how big would the file need to be if it was 4 mins long? Give your anseer in MB |
16 bits = 2B 44.1 kHz = 44100 Hz 4 mins = 240s Total file size = 44100 * 240 * 2 = 21,168,000B =20.2 MB |
