AQA COMPUTER SCIENCE 7517/2 VERSION 1.0 FINAL FINAL QUESTIONS PAPERS WITH MARKING SCHEME [MERGED]|2023

A sound is sampled and recorded digitally. The sound is sampled at a rate of 48 000 samples per second (Hz) for 3 minutes using a 16-bit sample resolution. Calculate the size of the digital recording, giving your answer in mebibytes. Give your answer rounded to 2 decimal places. You should show your working. [2 marks] Answer mebibytes 0 1 . 2 The highest frequency component in a different sound is 15 000 Hz. What is the minimum sampling rate that should be used when recording this sound to ensure that all the frequencies in the original waveform are preserved, so that when the recording is played back the original sound is recreated accurately? [1 mark] Answer Hz3 *03* Turn over ► IB/G/Jun23/7517/2 Do not write outside the 0 1 . 3 Figure 1 shows part of the process of playing back a sound that has been sampled. box The binary sound data is used to generate an electrical waveform. Figure 1 A hardware component on a sound card carries out the process shown in Figure 1. State the name of this component. [1 mark] Turn over for t