Sound Representation
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What does ADC stand for
Analogue to digital converter
What does DAC stand for
Digital to analogue converter
What is sound
A continuous set of data points formed by a wave
What does the ADC do
Converts analogue sound into a digital format
What does DAC do
Converts the digital format of sound back to analogue
What does a low sample resolution mean
Less options/bits
What does a high sample resolution mean
More options/bits
Equation for the size of a sound file (in bits)
Sample rate (per second) * Sample resolution (num. bits per second) * Length of sample (seconds)
How to convert bits to bytes
/ 8
What is a sample of 1 minute at 16 bits at 20KHz stored as in bytes
= 20,000 * 16 * 60 = 19,200,000 / 8 = 2,400,000 bytes
How to produce an accurate recording
The sampling rate must be at least double that of the highest frequency in the original signal
What is sound synthesis
Electrically generated sounds that mimics musical instruments or the human voice
What does MIDI stand for
Musical Instrument Digital Interface
What are five advantages of MIDI
• Less space • Easily manipulated • Instructions can be passed to other instruments • Event messages • MIDI metadata
What are five advantages of MIDI
• Less space • Easily manipulated • Instructions can be passed to other instruments • Event messages • MIDI metadata