Please enable JavaScript.
Coggle requires JavaScript to display documents.
Representing Sound (Analogue to Digital Conversion (Analogue sound samples…
Representing Sound
Analogue to Digital Conversion
Analogue sound samples are recorded via an amplifier
Each sample is quantised to measure its wave height and translate this into an integer value
The integer value is then converted and stored digitally as a binary value
To output a sound, the reverse happens
Analogue and Digital Signals
Analogue signals are continuous, whereas digital signals are discrete
Signals can be converted from one form to another
Real-world Data
Real-world data is usually analogue in nature with values that vary by any amount over time
Sound is a result of changes in air pressure
Pressure fluctuations cause our eardrums to vibrate
Nerve signals are interpreted as sound
Analogue to Digital Convertors
Examples of ADCs and DACs are:
Microphones
Speakers
Sampling
An analogue signal is measured at regular periods
The amplitude is referred to as the sample resolution
This is referred to as the sampling rate and is measured in Hertz
Sample Resolution
The number of bits used to record each measurement is known as the resolution
More bits used per sample enables the height of the wave to be more accurately measured but increases file size