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Nate's CTS Questions > CTS Questions and Shortcuts > Flashcards

CTS Questions and Shortcuts Flashcards

(85 cards)

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1
Q

Lighting Inverse Square Law

A

Double distance, intensity decreases by 4 (1/22)

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2
Q

300MHz - 3GHz is the the _________band?

A

UHF

ultra high frequency

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3
Q

What is refraction in video?

A

bending or changing of the direction of light ray when passing through between material boundaries, such as air and glass.

The refractive index measure the angle of refraction.

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4
Q

What is dispersion in video?

A

White light through a prism.

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5
Q

IPv4 is made up of ______x, ________ bit chunks.

A

4, 8

These are called octets.

232 potential IP address (4,294,967,296)

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6
Q

What is the Noise Rating (NR)?

A

A method used to specify or quantify the background noise levels from ventilation or other sources in an occupied space.

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7
Q

Formula for ANSI lumen rating is:

A

L = SH x SW x AI (average illuminance)

An incident light meter reading in the center of the of each of the 3x3 areas of the grid is needed.

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8
Q

Phantom power is supplied equally on both conductors, true or false.

A

True. Because its equal, this will not harm a dynamic mic.

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9
Q

Projection Brightness refers to:

A

black level control.

If too high, black appears gray.

If too low, black is all the same shade.

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10
Q

(1) Pascal is equivalent to_________ dB?

A

94.

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11
Q

RS-232:

Distance?

Conductors?

A

50-65’ because unbalanced

pair plus a ground

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12
Q

Parts above the reference level are____________ and parts below are called_______________.

A

Compression and Rarefraction.

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13
Q

What is spherical aberration?

A

Light in the edge of a lens leaves at a different angle than light through the center.

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14
Q

What is a gateway?

A

This is a router that connects to an outside network.

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15
Q

What is the Imager?

How many are in a camera?

A

Light hits this after passing through the lens.

Either done by a prism or (3) imagers (RGB) (DLP)

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16
Q

What is benchmarking?

A

Examining methods, techniques, and principals from peer organizations and facilities. Basically demos.

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17
Q

Additive Color uses:

Subractive Color uses:

A

Red, green, blue

Red, yellow, blue.

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18
Q

What is a router?

A

A device above the switch layer that that routes the packets to the destination IP address.

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19
Q

What is a bridge (networking)?

A

This connects two different types of networks.

Ethernet to WAN protocol for instance.

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20
Q

Specular Refelction, a mirror type reflection when most of the energy is reflected back in a single direction is known as __________ reflection.

A

Direct.

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21
Q

The signal strength of a condenser mic is stronger or weaker than a dynamic?

A

Weaker, which is why it needs a pre-amp.

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22
Q

How many samples per second in a 44.1 kHz CD?

A

44,100

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23
Q

The main electric panel distributes power using________ and ___________.

A

Feeders and Distribution Panels

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24
Q

Focal Length

A

Distance between lens and image sensor and subject is in focus, measured in mm.

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25
Candela
base unit for luminous intensity. Equal to a wax candle.
26
Frequency and Wavelength are __________ proportional.
Inversely. As one gets larger, the other gets smaller. The lowest frequencies have the longest wavelengths.
27
Foot candle
US customary measurement of illuminance. 1 foot candle = 1 lumen/square foot. 1 foot candle = 10.76 lux
28
What is the site survey checklist used to do?
Obtain general info about a client and site that may be relevant for the AV system design and installation tasks.
29
Lux
The international unit for illuminace. 1 lumen of light spread over 1 square meter. 10.76 lux = 1 foot candle
30
Video Clock Adjustment Symptom
too large or too small.
31
Video Scan Rates for Digital Video: For computers:
30 +/- 60
32
Acoustics cover how sound is \_\_\_\_\_\_\_\_\_\_\_, it's\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_, and \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.
Produced, propogation, and control
33
Sampling rate determines the signals accuracy with frequency, the precision (amplitude values) is the determined by...
Bit depth. the number of possible states increases by 2 to the power of the number of bits. 16 bits = 2 to the 16th power.
34
The human hearing frequency range is...
20 Hz to 20 kHz (range from 56.6' to less than 3/4")
35
36
Projection contract refers to:
Difference between lightest and darkest areas. If too low, white appears gray. If too high, whites appear the same shade.
37
RS-422 Distance? Conductors?
4,000' Balanced 4 wire
38
Low-impedence is ________ ohms or less while high - impedence is more than _________ ohms.
200 ohms or less (some up to 600), more than 25,000 ohms.
39
Color Temp
1900K - Candle Light 5400K - Daylight Ranges from "orange" low to "blue" high.
40
Low impedence mics are _______ ohm or less, sometime up to ________ ohms. High impedence can be \_\_\_\_\_\_\_\_\_\_ohms or more.
200, 600 25k
41
42
The speed of sound is: The speed of an electrical signal is:
343m/s (1,225') 90,000 miles per second. Reason for time algingment and delay!
43
Bit rate is...
Measurement of the quantity of information over time in a digital signal stream
44
What is curvature of field?
Blurry apperance around edges of projection screens. Resulting from the curved lens.
45
IPv6 use \_\_\_\_\_\_x groups of \_\_\_\_\_\_\_\_.
4, octets. Has 2128 potential address (340,282,366,920,938,463,463,374,607,431,768,211,456)
46
A vs C weight:
A - under 85dB C - over 85dB
47
What is Room criteria (RC)?
Metric in quantifying the tonal characteristics of ventilation noise, such as rumble or hiss. Take all components (walls, ceilings, diffusers, etc) as a whole into account.
48
Illuminance
the amount of light falling on a surface, measured in lux (lx) or footcandles (fc). 1 foot candle = 10.76 Lux
49
Once approved, what does the AV concept / design / program report become the basis for?
this will creat detailed AV design documents and cost estimates.
50
When you sample at 2x the frequency of the signal, you are using....?
Nyquist Rate
51
Sound pressure is reduced by \_\_\_\_\_\_dB every time the distance from the source is doubled.
6. Also known as the 6 dB per doubling rule.
52
When energy scatters and is reflected, its known as ___________ reflection.
Diffuse.
53
The number of times that sine wave cycles per seconds is called the ...
The frequency, also CPS (cycles per second).
54
The physical distance between 2 points exactly one cycle apart are is the ...
Wavelength
55
7 layers of the OSI Model
7: Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical
56
What is a needs analysis?
Identifies activities that the end user needs to perform, the develops the functional descriptions of the system that support those needs.
57
The main function of a diversity receiver is to....
Compare phase differences between signals to avoid cancellations.
58
Measuring an images bandwidth requires a\_\_\_\_\_\_\_\_\_\_\_.
Spectrum analyzer
59
The output of a device should have an impedence \_\_\_\_\_\_\_\_% or less the impedence of the input device.
1/10th or 10%
60
Equations for Frequency, Wavelength, and Velocity:
f = v/L L= v-f v = L \* f
61
The spectrum of hearing is divided into\_\_\_\_\_\_\_\_\_ octave bands, and each band is \_\_\_\_\_\_\_\_\_\_octave.
10, 1.
62
30MHz - 300MHz is the the \_\_\_\_\_\_\_\_\_band?
VHF Very High Frequency
63
Zigbee: Distance? Configuration?
100' Line of Site Point to point or mesh.
64
MAC address stands for :
Media Access Control Address. Parts of the IEEE 802 standard and uses a 48 bits number with 6 groups of /two hexidecimal numbers.
65
What are the parts of a program reports after a program (needs analysis) meeting(s)?
1. Executive Summary (overview, what facility is, ohw used) 2. Space Planning (special requirements control, storage, etc) 3. Systems Descriptions (AV sketches, drawings, diagrams, spec sheets) 4. Infrastructure Considerations (lighting, electrical, acousstical, network, etc) 5. AV Budgets (opinion on probable cost, estimate and quotes later)
66
Conversion of energy from one for to another is called...
Transduction.
67
Radio Frequency Range?
3kHz - 300GHz
68
What are (2) types of imagers?
CMOS - complementary metal oxide semiconductors CCD - Charged coupled device.
69
What does 1:50 on a metric scale mean?
1 unit on paper is 50 in the real space.
70
Octave Center Bands:
* 30Hz * 60Hz * 120Hz * 250Hz * 500Hz * 1kHz * 2kHz * 4kHz * 8kHz * 16kHz
71
Video Phase Adjustment Symptoms
Phase adjustments are at the pixel level. Fine detail will be fuzzy.
72
Nit
Used for display screens. Nit = 1 candela per square meter
73
Metric (SI) to US:
Meters to Feet = multiply by 3.28084 Centimeters to Inches = multiply by .3937008 Milimeters to Inches = multiply by .03937008 Feet to Meters = multiply by .3048 Inches to Centimeter = mulitply by 2.54 Inches to Millimeters = multiply by 25.4
74
DHCP stands for what?
Dynamic Host Configuration Protocol \* an IP address is automatically assigned to the MAC address and is contigent upon the subnet size and number of available addresses.
75
Video Quality... Passive Viewing: Basic Decision Making (BDM): Analytical Decision Making (ADM):
Does not require detail or retention Decisions are made, but detail is not needed. Classrooms, boardrooms, product illustrations. Decision Based on Details. Medical imaging, engineering prints, forensics.
76
Inverse Square Law - sound energy is inversely proportional to the square of the distance from the source. Ever time distance doubles from the source, the energy spreads and covers \_\_\_\_\_\_\_\_\_\_\_x the area it did before.
4
77
At what point in the AC power system are the branch circuits that power wall outlets and AV equipment connected?
Subsidiary distribution panel (panelboard)
78
Wire vs Cable
Wire is a single conductor
79
Aperature of a Lens is\_\_\_\_\_\_\_\_ Measured in\_\_\_\_\_\_\_\_
The opening of the lens, regulating amount of light let in. This is measured in F-stops. The larger the number, the smaller the opening.
80
Generally, a \_\_\_\_\_\_\_\_\_measurement of incident light is taken at a task area like a video screen.
Lux
81
RS485: Distance? Conductors?
4,000' UTP (DMX 512 for instance)
82
a sample rate of 44.1 khz equate to how many frequency samples per second? (this is a standard CD sample rate)
44,100 samples per chanel per second (2 channels for a cd)
83
Bit depth related to a signals ___________ instead of the frequency of the original signal.
Amplitude
84
Bit rate (flow of information) is calculated by the multiplying the ________ \_\_\_\_\_\_ by the ______ \_\_\_\_\_\_\_\_\_\_\_.
sample rate and bit depth. A CD with a sample rate of 44.1 khz and a bit dept of 16 bits per channel: 44,100 x 16 x 2 (2 channels) = 1.411 Mbps (Mega = 106)
85

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