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(a) Tick (✓) one or more boxes in each row to identify whether each statement applies to each character set - OCR - GCSE Computer Science - Question 1 - 2021 - Paper 1
Question 1
(a) Tick (✓) one or more boxes in each row to identify whether each statement applies to each character set. | Statement | ASCII | Extended ASCII | Unicode | |-----... show full transcript
Worked Solution & Example Answer:(a) Tick (✓) one or more boxes in each row to identify whether each statement applies to each character set - OCR - GCSE Computer Science - Question 1 - 2021 - Paper 1
Step 1
Can represent thousands of different characters, including Russian and Chinese symbols.
Answer
This statement applies to Unicode, as it is specifically designed to represent a vast array of characters from various languages, including Russian and Chinese symbols. ASCII and Extended ASCII cannot represent such a wide range of characters.
Step 2
Step 3
Step 4
Describe the data that is recorded when sound is sampled.
Answer
When sound is sampled, the audio signal is measured at regular intervals, and these measurements are recorded as binary values. Each sample captures the amplitude of the sound wave at that specific moment in time, allowing for the reconstruction of the audio during playback.
Step 5
Explain what is meant by a sample rate of 48 KHz.
Answer
A sample rate of 48 KHz means that the audio signal is sampled 48,000 times per second. This rate indicates how frequently the audio signal is measured, with higher sample rates providing better sound quality and more accurate representation of the original sound.
Step 6
Describe how the file size of the sound recording could be reduced.
Answer
The file size of the sound recording could be reduced by lowering the bit depth, for example, from 24 bits per sample to 16 bits per sample. Alternatively, reducing the sample rate (e.g., from 48 KHz to 44.1 KHz) or compressing the audio file using formats like MP3 or AAC can effectively reduce the overall file size.