4 - Sound
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What is one advantage of increasing the number of bits allocated to each sample?
Sound quality will be improved/clearer, smoother, better resolution, more accurate, higher fidelity
What is one disadvantage of increasing the number of bits allocated to each sample?
The size of the sound file will increase
Name two items of essential software required during the recording process.
• Sound recording software • Operating system • Driver • Codec
What is a key advantage of using MIDI to represent music instead of using sampled sound?
More compact representation
Describe a benefit of MIDI regarding editing music.
Easy to modify/edit at note level
One way of representing sound digitally is by using sampling. An alternative to using sampled sound is MIDI. State two advantages of using MIDI instead of sampled sound.
More compact representation; Easy to modify / edit notes; Easy to change instruments; Musical score can be generated directly from a MIDI file; No data lost about musical notes.
How is music represented in MIDI?
As a sequence of MIDI event messages
What is one example of data contained in a MIDI message?
Pitch/frequency/note number
Explain the principles of operation of an ADC.
Analogue signal sampled at fixed time intervals; amplitude/voltage measured and coded into a fixed number of bits
State Nyquist’s theorem.
Sample at a frequency at least twice the rate of the highest frequency present in the original signal
What is meant by synthesised sound?
Sound produced using the computer/from software
Name two features of the coding system that affect sound quality.
• Number of bits used to store each value • Sampling rate/frequency of sampling
Explain how the electrical signal from the microphone is converted for storage.
Sampling converts analogue sound into digital; quantisation samples the height of the wave at regular intervals; coding represents height/value by a number/binary code