A sound file has a sampling rate of 44.1 kHz and a sample resolution of 16 bits. If the sound is recorded for 5 seconds, calculate the size of the resulting digital sound file in bits.
Sound File Calculations (3 marks) Read More »
Define data compression and explain why it is often necessary to compress data.
Why Compress? (2 marks) Read More »
Describe how run length encoding (RLE) compresses data and give the RLE representation for the following binary sequence: “0001110011”.
Run Length Encoding (5 marks) Read More »
Convert the bitmap representation “1100011111” into RLE frequency/data pairs.
RLE Frequency/Data Pairs (3 marks) Read More »
Define ‘sample resolution’ in the context of sound digitisation.
Sample Resolution (2 marks) Read More »
Describe one advantage and one disadvantage of increasing the sample rate and resolution of a digital sound file.
Advantage and Disadvantage of Increasing the Sample Rate and Resolution (4 marks) Read More »
A bitmap image is made up of pixels. Describe how changing the number of pixels and colour depth can affect the file size and quality of a bitmap image.
Effect of Resolution and Colour Depth (4 marks) Read More »
Explain why sound, which is an analogue signal, must be converted to digital form before a computer can process it.
The Need for Digital Sound (2 marks) Read More »
Describe the term ‘sampling rate’ in the context of digital audio.
Sampling Rate (2 marks) Read More »
Describe two advantages of using Unicode over ASCII for character encoding.
Advantages of Unicode over ASCII (4 marks) Read More »
