Analogue and Digital Recording Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

What are the only values a digital signal can possess?

A

0 or 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What does the process of analogue to digital conversion involve?

A

Taking digital samples of the momentary amplitude of a waveform

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

In analogue to digital conversion, what is a continuous analogue signal converted into?

A

A series of binary numbers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

With regards to analogue to digital conversion, what is the sample rate?

A

The number of times the amplitude of the analogue signal is read

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

In analogue to digital conversion, what is 1Hz equal to?

A

1 sample of the waveform’s amplitude taken every second

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What sample rate is CD quality?

A

44.1kHz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What sample rate is DVD quality?

A

48kHz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Why is there an argument against recordings at a sample rate higher than 48kHz sounding better?

A

Because the limitations of human hearing mean you would very unlikely hear any difference

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What effect does the sample rate have on the frequency response of equipment?

A

The higher the sample rate, the greater the highest frequency captured

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is Nyquist’s theorem?

A

The sample rate of a digital system should be a minimum of twice the highest frequency captured

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What occurs when the sample rate is not high enough?

A

Aliasing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What happens to frequencies above the Nyquist frequency?

A

They are captured and incorrectly recreated within the audible range below the Nyquist frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What does the incorrect recreation of frequencies above the Nyquist frequency manifest as?

A

Artefacts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

In analogue-digital conversion, what is the bit depth?

A

The level of detail the amplitude is measured to for each sample

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What effect does a higher but depth have on the signal?

A

The greater the bit depth, the greater the dynamic range, and therefore the signal-to-noise ratio

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the bit depth of CD quality?

A

16-bit

17
Q

What bit depth is commonly seen with digital audio?

A

24-bit

18
Q

Why is a bit depth of 24 useful when working on a project?

A

The noise on multiple tracks soon adds up

19
Q

With regards to analogue-digital conversion, what is dithering?

A

The introduction of small amounts of unobtrusive, randomly-generated noise into the conversion process

20
Q

In analogue-digital conversion, what effect does dithering have?

A

It randomises the effect of quantisation error

21
Q

True or false: analogue signals are less susceptible to interference than digital signals

A

False

22
Q

What happens if an analogue signal picks up noise?

A

It forms part of the waveform

23
Q

What happens if a digital signal picks up noise?

A

It doesn’t degrade in quality, as it still identifies as 0 or 1