A marine research hydrophone captures a 1.0-second underwater sound pulse from a dolphin. The analogue sound wave is converted into a digital audio file.
The recording is sampled at a rate of 8 Hz. The digital representation has a bit depth of 4 and is stored in two's complement.
Sound data:
0011 0100 0001 1110 1101 1101 0000 0010
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.