A Level Computer Science AQA, Binary
Representation of Images and Sound
2024 Exam Review
Describe how bit patterns may represent other forms of
data, including graphics and sound. - Answer>>Bit
patterns can be used to store information about other
forms of data, for example images can be stored using the
images height and width in pixels with the colour depth
and sound can be stored as digital samples of the original
sound.
Understand the difference between analogue and digital
data. - Answer>>Analogue data is a continuous wave
recorded in its original form, when analogue waveforms
are sampled at intervals and turned into a discrete set of
numbers it produces digital data.
Understand the difference between analogue and digital
signals.. - Answer>>Analogue: a continuous signal
which represents physical measurements. Digital: discrete
time signals generated by digital modulation.
Describe the principles of operation of an analogue to
digital converter (ADC) - Answer>>A microphone
converts the sound energy into electrical energy. The ADC
samples the analogue data at a given frequency,
measures the amplitude of the wave at each point and
converts it into a binary value using the resolution of each
sample.
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