An acoustic monitoring station records a low-frequency sound pulse from an underwater volcanic eruption. The captured analogue signal is converted into a digital representation.
The recorded sound clip is exactly 0.5 seconds long and is sampled at a frequency of 16 Hz.
The digital representation of the wave has a bit depth of 4 and is stored in two's complement.
Sound data:
0100 0010 1101 1010 1100 0000 0101 0011
Draw a graph on the grid below to represent the sampled digital sound wave.
You must include:
- descriptive labels for both the x and y axes
- appropriate numerical values for both axes
- each digital sample plotted clearly as an 'X'
- the individual sample points joined up with straight lines to show the wave shape
Data representation Questions
Practise Edexcel GCSE Computer Science Data representation with exam-style questions for GCSE Computer Science. 50 questions covering Encoding characters with 7-bit ASCII, Representing bitmap images in binary, Representing analogue sound in binary, and Limitations of binary representation, matched to the Edexcel GCSE Computer Science (1CP2) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.