Computer Science (AS & A Level) · May / June 2023 · Paper 21 · Question 6

A video-conferencing program supports up to six users. Speech from each user is sampled and digitised (converted from analogue to digital). Digitised values are stored in array Sample. The array Sample consists of 6 rows by 128 columns and is of type integer. Each row contains 128 digitised sound samples from one user. The digitised sound samples from each user are to be processed to produce a single value which will be stored in a 1D array Result of type integer. This process will be implemented by procedure Mix(). A procedure Mix() will: • calculate the average of each of the 6 sound samples in a column • ignore sound sample values of 10 or less • store the average value in the corresponding position in Result • repeat for each column in array Sample The diagram uses example values to illustrate the process: 1 1 2 3 4 5 6 2 3 ... 126 127 128 Sample: Result: 20 20 20 20 20 30 20 20 40 20 20 50 20 3 5 20 4 2 30 30 2 50 30 3 40 40 4 40 50 20 6 60 4 4 70 30 20 20 35 40 46 25 11 Write pseudocode for procedure Mix(). Assume Sample and Result are global. [6]

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