Computing - Sound
What is the main difference between an analogue and digital signal?
Analogue signals are continuous while digital signals are discrete.
In one sentence, how does a digital-to-analogue converter for sound work?
Sound is captured by a microphone which is sampled at regular intervals and these samples are converted to binary.
The frequency at which samples of a sound are taken is called?
The sampling rate.
When an analogue sound signal is being converted to digital, what value is sampled?
Amplitude/voltage.
What is sample resolution?
The amount of bits used to record each sample.
What is the benefit of a higher sample resolution?
More accurate representation of the analogue sound.
What is the drawback of a higher sample resolution?
A larger file size.
What is the formula for file size of a sound?
What is the symbol representation of Nyquist Theorem?
What does $f _ {\text{max}}$ stand for in the Nyquist Theorem?
The max frequency in the sound.
What does the Nyquist Theorem state?
That the sample rate should be _ _ over _ _ two times the highest frequency in order to create an accurate sample.
The theorem that the sample rate should be _ _ over _ _ two times the highest frequency is called?
The Nyquist Theorem
Why are CDs sampled at $44.1kHz$?
Because the max of human hearing is $22kHz$, so it’s over double.