T2 - Sound + Compression Flashcards
Analogue sound signals are which type of data
continuous.
Digital signals are which type of data
discrete.
How Sound is digitized:
by repeatedly measuring + recording the sound wave
A to D converters:
Sounds is converted to a digital form
= stored + processed by a computer
An Analogue to Digital Convertor (ADC) is used for
to convert inputs to digital signals.
A Digital to Audio Convertor (DAC) is used for
to convert digital signals to outputs.
Sound sampling -
measurement of amplitude of a
sound wave at a given time
How is sound sampled:
- Sound is sampled using a bit depth and sample rate
what does bit depth determine in sound sampling
determines how closely the wave is sampled on the y-axis
Sampling rate -
number of samples taken per second
(Hz)
Sample resolution:
The number of bits used to record
each measurement
More bits used per sample =
- the height of the wave to be more accurately measured
- increases file size
Hertz
- 1Hz = 1 sample per second
sample resolution aka
audio bit depth
Sampling rate frequency:
The greater the frequency, the greater the accuracy, and file size