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Multimedia Technologies > Surround Sound > Flashcards

Surround Sound Flashcards

1
Q

Ls

A

Left surround

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2
Q

Rs

A

Right surround

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3
Q

Mono-pole speakers

A

Sound is only emit from the front

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4
Q

Di-pole speakers

A

Sound is emitted from the two sides

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5
Q

Tri-pole

A

Sound is emitted from both the two sides, and the front

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6
Q

Music-specific rooms tend to use what type of speakers

A

Mono-pole

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7
Q

Surround sound-specific rooms tend to use what kind of speakers?

A

Multi-pole

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8
Q

In a stereo mix, how is the ‘centre’ sound created?

A

Sending the same audio signal into both the left and right speakers and equal volume

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9
Q

Phantom centre

A

A faux centre created in a stereo mix by sending sounds panned equally between the left and right channels with equal volume, creating the illusion of a centre speaker

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10
Q

Sample rate of SACD

A

2.8224 MHz

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11
Q

Maximum frequency response for Surround channel in Dolby Surround mix

A

7 kHz

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12
Q

Dolby Digital compression ratio

A

11:1

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13
Q

DSD

A

Direct Stream Digital

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14
Q

DTS compression ratio

A

3:1

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15
Q

SDDS compression ratio

A

5:1

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16
Q

Film format that optically prints audio tracks on the outer edge of 35mm film

A

SDDS

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17
Q

Maximum sample rate of Blu-ray

A

192 kHz

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18
Q

Possible placements for the two extra speakers in a 7.1 system

A
  1. Left and right side
  2. Left centre and right side
  3. Rear centre channel and VOG
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19
Q

T/F: Dolby Pro Logic is the consumer decoder for surround sound

A

True

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20
Q

ITU-R BS.775-1: Engineer should be placed where amongst the speakers

A

Equal distance from the 5 main channel speakers

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21
Q

Dolby Surround: A signal that is identical in both the Lt & Rt, and 180˚ out of phase goes to this speaker

A

Surround

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22
Q

ITU-R BS.775-1: How many degrees off centre should the left and right speakers be when mixing in 5.1?

A

30˚

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23
Q

T/F: The term ‘codec’ only applies to digital soundtracks

A

False - codecs have been used to encode and decode sound for film, analog VHS tapes, etc

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24
Q

THX

A

A certification process for precise audio reproduction characteristics

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25
Q

2 other names for the Grid Panner

A
  1. X/Y panner

2. Etch A Sketch panner

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26
Q

VOG

A

Voice of God speaker

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27
Q

VOG placement

A

Directly overhead

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28
Q

Dolby Digital soundtrack is also referred to as these

A

Audio Codec-3
AC-3
.ac3

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29
Q

On a surround monitor controller, inputs that are greater than 2 channels are called:

A

Wide inputs

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30
Q

Codec that allows you to provide surround sound from a 2-channel mix

A

Dolby Pro Logic II

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31
Q

ITU-R BS.775-1: How high should speakers be when mixing in 5.1?

A

All the same height

32
Q

T/F: THX is a surround sound encoding format

A

False

33
Q

T/F: Not all Dolby Digital soundtrack are matrix encoded

A

True

34
Q

In Pro Tools, what must the Centre Percentage control be set to to achieve a ‘true centre?’

A

100%

35
Q

T/F: Bass management is part of the mixing process

A

False

36
Q

T/F: The LFE channel is also known as the subwoofer channel

A

False - there is no such thing as a ‘subwoofer channel.’ The channel is LFE and is reproduced by a subwoofer

37
Q

Surround playback format that mirrors 5.1 but adds a rear centre surround channel

A

6.1

38
Q

Amount of channels of audio that are produced by the Dolby Surround decoding process

A

4

39
Q

Divergence is commonly referred to as

A

Bleed control

40
Q

T/F: Surround systems that use a dedicated LFE channel are called dot one systems

A

True

41
Q

ITU

A

International Telecommunications Union

42
Q

On a surround monitor controller, listening to a multichannel mix in a lesser channel format is called

A

Downmixing

43
Q

Typically, how many channels are in a Surround Sound system?

A

Any amount higher than 2

44
Q

LFE channel plays through this speaker

A

Subwoofer

45
Q

SMPTE channel order standard

A
  1. L
  2. R
  3. C
  4. LFE
  5. Ls
  6. Rs
46
Q

DTS channel order standard

A
  1. L
  2. R
  3. Ls
  4. Rs
  5. C
  6. LFE
47
Q

Dolby / Film channel order standard

A
  1. L
  2. C
  3. R
  4. Ls
  5. Rs
  6. LFE
48
Q

Output of Dolby Surround encoder is called

A

LtRt

49
Q

2 reasons why Blu-ray and DVD often contain soundtracks with data compression

A
  1. Space on the disc is limited, and digital video occupies a large amount of the available space
  2. Players requiring a laser to read information from a disc have limited bandwidth in their data streams which must be divided for the picture and sound
50
Q

ITU-R BS.775-1: Ideal placement for the surround speakers while mixing in 5.1

A

110˚

51
Q

LFE

A

Low Frequency Effect

52
Q

Systems that are .0

A

Have no dedicated LFE channel

53
Q

Playback format

A

The channel systems, such as 4.0, 5.1, 7.1, etc. This will also indicate where speakers should be positioned in the room

54
Q

Delivery format

A

How the final surround mix is delivered to the consumer, such as DVD, Blu-ray, VHS, etc.

55
Q

Quadraphonic

A

4.0 playback system from the 70s/80s and the first multichannel system designed for music delivery to consumers
L, R, Ls, Rs

56
Q

LCRS

A

4.0 playback system that is still widely used in surround sound

57
Q

5.0

A

Playback format that combines Quadraphonic and LCRS, with 3 front speakers L, C, R and two surround speakers Ls and Rs

58
Q

5.1

A

Playback format that is exactly like 5.1 but adds a dedicated LFE channel

59
Q

6.1

A

Playback format that is exactly like 5.1 but adds a Center Surround speaker. This gives us 3 front speakers L, C, R, 3 surround speakers Ls, Cs, Rs, and a subwoofer

60
Q

7.1

A

Playback format that is like the 5.1, but adds two more speakers in the back, and moving the surround speakers to the sides. This gives us 3 speakers in the front L, C, R, 2 speakers on the sides Ls and Rs, and 2 speakers in the rear Left Back and Right Back. Lastly .1 means there is a dedicated LFE channel, giving us a subwoofer

61
Q

Surround Sound Monitor Control: Speaker Selection

A

Controller provides the ability to switch between multiple multichannel speaker systems, as well as to make different combinations

62
Q

Surround Sound Monitor Controller: Speaker Muting

A

Most consumer surround playback systems do not have the capability to mute individual speakers, but it is mandatory for a professional surround sound monitor controller to provide this ability

63
Q

Downmixing

A

Checking a multichannel mix in a playback format with fewer channels

64
Q

Centre Percentage to achieve a True Centre

A

100%

65
Q

Centre Percentage to be equally in the true centre and phantom centre

A

50%

66
Q

Centre Percentage to achieve a Phantom centre

A

0%

67
Q

Typical frequency to set the LFE split at

A

80 Hz

68
Q

Encode

A

The process of packaging the audio for delivery

69
Q

Decode

A

Unpackaging to be able to playback

70
Q

Codec

A

A process that a system uses to be able to encode and decode a delivery format

71
Q

Discrete systems

A

Keeps the channels separated

72
Q

Multiplex

A

Ability to combine multiple channels into a single channel of information

73
Q

Matrix systems

A

Packaging surround sound mixes into two channels, allowing the audio to sound correct in stereo; but if played through equipment that can decode the surround sound mix, it can be expanded back to its original multichannel format

74
Q

T/F: LtRt can be heard as a traditional stereo mix

A

True

75
Q

What happens if LtRt is sent through a matrix decoder?

A

Matrix decoders recover the additional surround channels such as the centre and surrounds

76
Q

How does the Matrix decoder direct the 2-channel mix into a multichannel mix?

A

Left: Any signal that is sent only to Lt
Centre: Any signal that is sent equally to both Lt & Rt and is IN phase
Right: Any signal that is sent only to Rt
Surround: Any signal that is sent equally to both Lt & Rt and is OUT of phase

77
Q

Upmixing

A

When a single-ended matrix decoder derives a multichannel output from stereo mixes that were never mixed or encoded for surround sound

Multimedia Technologies (3 decks)

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