creating sound

Question 1

what is sound?

Answer 1

an impact from an instrument, voice or object that causes fluctuating vibrations that create a sound wave

Question 2

what two elements make a sound?

Answer 2

loudness and frequency

Question 3

what is amplitude?

Answer 3

height of the wave, measured in decibels (dB), sound pressure levels (SPL)

Question 4

what is the decibel of a whisper?

Answer 4

20dB

Question 5

what is frequency?

Answer 5

the pitch of a sound
measured in hertz (Hz) and kHz
can also be measured in cycles per second
the more cycles per second will increase the frequency making the pitch higher

Question 6

whats the lowest frequency a human is capable to hear?

Answer 6

the range of frequencies for human hearing is from 20Hz to 20 kHz

Question 7

what is nyquist’s law?

Answer 7

a sound must be sampled at least twice the minimum frequency of human hearing i.e. 20Hz - 40Hz

Question 8

what is sample rate?

Answer 8

how many samples per second are taken to produce the digital audio signal

Question 9

true or false, the less samples that are taken the higher the accuracy compared to the original acoustic sound?

Answer 9

false, the more samples that are taken the higher the accuracy compared to the original acoustic sound?

Question 10

what is the usual sample rate for CDs?

Answer 10

44,100 samples per second or 44.1kHz

Question 11

what is bit depth?

Answer 11

the dynamic range of an audio signal

Question 12

how does bit depth work?

Answer 12

the higher the bit depth the more increments between the quietest sound to the loudest sound