Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Audio and sound reinforcement > Chapter 2 > Flashcards

Chapter 2 Flashcards

1
Q

What is frequency response?

A

The relationship between the device’s input and output with regard to signal frequency and amplitude.

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

What is a frequency response plot?

A

It shows us the range of frequencies that the black

box will pass from input to output, and what fluctuations in output level (if any) occur within that range.

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

What is the proper term for signal generating devices (oscillators, musical instruments, and so on)?

A

frequency range

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

FREQUENCY RESPONSE:
30 Hz to 18 kHz, ±3 dB
what does the “ ±3 dB “ represent?

A

the tolerance of the specification

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

What is another name for frequency response?

A

magnitude response

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

What is a normalized plot?

A

If the input to a device under test is not constant in level at all frequencies, a correction may be made to the output plot (or the input level can be intentionally varied to make it constant).

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

What is the octave?

A

a special musical interval between two tones, formed

when the ratio between the frequencies of the tones is 2:1

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

_____ ____ is a randomly generated signal that excites all the audio frequencies with equal energy
per octave.

A

Pink noise

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

The audio elements that exhibit the flattest

frequency response characteristics are _____ _____ and _____

A

electronic circuits and cables

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

What is the tolerance of the specification?

A

tells us the maximum deviation in output level that we can expect over the stated range if the input level
remains the same at all frequencies.

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

What sounds is compared to waterfalls?

A

Pink noise

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

How does a constant input level affect the frequency response plot?

A

it gives us an indication of the fidelity with which the device transfers a signal from input to output

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

TRUE OR FALSE

Without a stated tolerance, the frequency response specification is useless

A

True

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

Describe a practical audio system

A

a network of many different types of devices through which the signal must pass on its way to the listeners’ ears.

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

Describe the typical make up of a audio cable

A

The typical audio cable consists of one or two signal conductors surrounded by insulation and a shielding
conductor

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

What is another name for the low-frequency roIloff?

A

subsonic filter pole

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is a presence peak?

A

A broad peak in response of 3 to 6 dB, centered in the

region between about 2 kHz and 5 kHz

18
Q

What exhibits a peak of 8 kHz to 10 kHz and gives off a brittle or bright quality of the sound?

A

Condenser type microphones

19
Q

What is another name for high frequency rolloff?

A

TIM (transient intermodulation distortion) filter

20
Q

What are Ribbon type microphones?

A

exhibit both a presence peak and a slight low-frequency rise, usually around 200 Hz

21
Q

What is harmonics?

A

When a musical note with a complex waveform has a distinct pitch (as opposed to noise), that waveform can
ultimately be created by combining a set of precisely related sine waves.

22
Q

What is the effect of a presence peak?

A

Adding a bit of crispness to the spoken voice and can . ‘ Increase the intelligibility of words.

23
Q

What is the effect of low-frequency roIloff?

A

reject ultra-low frequencies that could damage loudspeakers and/or modulate the audio to produce undesirable distortion

24
Q

What is the effect of high frequency rolloff?

A

This intentional limiting of high-frequency

response serves to minimize TIM, and also helps to reject supersonic frequencies that can damage tweeters.

25
What is the effect of Ribbon type microphones?
This lends to them a warm sound quality, making them | popular choices for both voice and certain instruments
26
The less ____1___ there is in ____2____ across | the stated frequency band, the more ___3____ the signal at the output will reflect the signal at the input
1. deviation 2. output level 3. faithfully
27
the frequency response plot assumes a constant _____ _____ to the device under test
input level
28
What is a common definition of frequency response?
the usable range of signal frequencies which the device will pass from input to output.
29
The ideal ______ produces the same output level at all frequencies
oscillator
30
What is the common frequency response issues caused by cables?
Are generally due to capacitance between the signal conductor and shield in the cable, and capacitance between the conductors themselves
31
As the frequency multiplier___1___, the amplitude (or strength) of the harmonic usually ___2____
1 increases | 2 decreases
32
How does room resonances system's response indoors?
cause dips or, more commonly, peaks in the response.
33
True or False | The frequency response of any sound system is NOT affected by the environment in which it works
False | The environment does affect the frequency response of any sound system
34
What are the main factors affecting a system's response outdoors?
wind, temperature, and air absorption.
35
The degree to which the air absorbs high frequency energy is affected by the __________.
relative humidity
36
What are the predominant factors affecting a system's response indoors?
reflections from wall, ceiling and floor surfaces, and room resonances
37
How does wind affect a system's response?
Wind tends to deflect sound very slightly as it travels, and gusty wind can appear to modulate the sound.
38
Describe the effect of temperature on a system's response
Temperature gradients can also deflect sound, and | to an even greater degree than wind gradients.
39
How does reflection affect a system's response indoor?
Reflections not only cause reverberation effects, but also can cause cancellations at specific frequencies which show up as dips in the system response.
40
__________________ are used to send signals over long cables
Special line driver amplifiers
41
True or False | Air absorption affects mainly high frequencies.
True
42
How does air absorption affect the system's response outdoor?
As sound travels through air, the energy of the highs is lost more quickly than that of the lows.

Audio and sound reinforcement (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions