Sound

Question 1

What is an Analogue Signal?

Answer 1

Natural Sound Waves
A continuous signal that represents physical measuremments

Question 2

What is a Digital Signal?

Answer 2

Discrete digital format for representing natural sound waves
Discrete time signals generated by digital modulation

Question 3

What is an ADC?

Answer 3

Analogue To Digital Converter

Question 4

What is a DAC?

Answer 4

Digital To Analogue Converter

Question 5

What is a Sound Sample?

Answer 5

A digitally recorded fragment of sound, taken from an existing track or sound environment..

Question 6

What is Sample Resolution?

Answer 6

Represents how many different gradations of amplitude can be represented in a digital wave form.

Question 7

What is Sample Rate?

Answer 7

How often (frequency) you record the amplitude of a sound wave

Question 8

What is Nyquist’s Theorem?

Answer 8

That to produce an accurate recording you need to use a sampling rate which is at least double that of the highest frequency in the original signal

Question 9

What are MIDI files?

Answer 9

MIDI is a protocol that allows electronic musical instruments, computers, and other devices to communicate with one another.

Question 10

What does MIDI stand for?

Answer 10

Short for “Musical Instrument Digital Interface

Question 11

What is Digital data?

Answer 11

Analog waveforms are sampled at regular intervals, turned into a limited set of numbers and stored digitally

Question 12

What is Analog Data?

Answer 12

A sound wave is recorded in its original form - e.g.: onto a tape.
It can then be read and sent to a speaker

Question 13

What is Analog Representation?

Answer 13

Uses a continuous range of values to represent the sound

Question 14

What is Digital Representation

Answer 14

Uses discrete or discontinuous values to represent the sound

Question 15

How are Analog signals captured?

Answer 15

Continuously varying quantities are measured and captured

Question 16

How are Digital Signals captured?

Answer 16

Quantities are counted rather than measured

Question 17

What are the two major factors that affect the quality of any digitally converted sound wave?

Answer 17

Sample rate
Sample Resolution

Question 18

What is sample rate?

Answer 18

The speed or frequency of capture
How frequently the amplitude of a sound wave is recorded

Question 19

What is sample resolution

Answer 19

The level of detail the sound is captured in each time it is sample
How many gradations of amplitude can be represented in a digital waveform

Question 20

What is the number of sample per second measured in?

Answer 20

Hertz (hz)

Question 21

How many hertz are in a typical audio file?

Answer 21

44100 samples per second

Question 22

What is the normal frequency range of a human ear?

Answer 22

44,100Hz

Question 22

How to calculate the Size of a Sound File?

Answer 22

Sample Rate * Duration * Sampling Resolution
Num of Samples per Sec * Num of bits per sample * Length of sample in sec

Question 23

What happens if sample is recorded in stereo?

Answer 23

it is doubled 2x

Question 24

How to calculate bitrate?

Answer 24

Bitrate = Sample Rate x Bit Depth x (num of channels)

Question 24

What units are sample resolution in?

Answer 24

Bits

Question 25

What units is Sample Rate in

Answer 25

Hertz (Hz)

Question 26

What units is duration in?

Answer 26

Seconds (s)

Question 27

How to convert to Bytes?

Answer 27

Bits / 8

Question 29

What does MIDI do?

Answer 29

Allows electronic musical instruments to communicate with computers and each other.

Question 30

What does the MIDI controller do?

Answer 30

Receives event messages to each device. Messages specify details like: Duration of note, Pitch, Volume Change, Vibrato, Tempo Synchronisation