Digital Audio Flashcards
When a sound is converted into digital form, what takes a series of snapshots of the sound?
The ADC (Analogue-to-Digital converter).
What is Frequency determined by?
Rate at which amplitude rises and falls.
What are waveforms a series of?
Amplitudes.
Measured in kilhertz (kHz), what is the rate at which snapshots are taken?
Sample Rate.
How many snapshots per second?
Sample Rate.
What is the standard sample rate (kHz)?
44.1kHz (cd standard), 48 kHz (new, better standard)
What determines the highest frequency that can be recorded?
Sample Rate.
What determines the level of the noisefloor?
Bit Depth.
What does Bit Depth measure?
The amount of detail in each snapshot.
If Bit Depth is higher, what will happen to the measurement?
It will be more accurate.
What is the difference between low and high bit depth?
Noisefloor.
What is the level of noisefloor?
Signal to noise, measured by Bit Depth.
What is Dither?
A small amount of random noise to a digital audio in order to reduce the distortion caused by quantization error.
What is Nyquist Theorem?
Each cycle of the sound’s vibration must be sampled a minimum of twice.
What is the range of human hearing?
20 Hz to 20 kHz.
