# AMS Fullsail

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1. Acoustical Studies I
3 forms of particle motion?
• Cylindrical
• Transverse
• Longitudinal
2. Acoustical Studies I
Formula to calculate speed of sound knowing only the temperature?
c = 49√(459.4 + degrees F)
3. Acoustical Studies I
How does temp affect speed of sound?
• Temp increases, so does speed of sound
• Temp decreases, so does speed of sound
4. What is wavelength?
The distance a wave travels to complete one cycle
5. Acoustical Studies I
How do you calculate wavelength?
λ = 1130/Hz
6. Acoustical Studies I
How do you calculate octave relationships?
• 2:1 ratio
• Doubling of halving
7. Acoustical Studies I
How do you calculate harmonics?
Multipliers of the fundamental
8. Acoustical Studies I
Formula to calculate a range of octaves?
2^n = ƒH/ƒL
9. EASE 1
EASE was developed by?
Wolfgang Anhert
10. EASE 1
Types of room input methods other than vertex by vertex?
• Extrude
• Insert 3D shape
11. EASE 1
5 types of 3D shapes you can insert?
• Cylinder
• Cuboid
• Cupola
• Cone
• Pyramid
12. EASE 1
Interior surfaces are what color?
Yellow
13. EASE 1
Save & Apply hotkey?
F6
14. EASE 1
Most rooms modeled in negative axis. Why?
That's the way speakers are facing when inserted
15. EASE 1
Command for cutting a face into 2 faces?
Fixed cut
16. EASE 1
Delete Unattached Vertices hotkey?
Ctrl+Shift+F12
17. EASE 1
When adding floor to ceiling columns, you must:
Is coat of?
18. EASE 1
What are some of the prototypes available?
• Church
• Amphitheater
• Gothic dome
• Tricue
• Station
• Redoubt
• Theater
• Shell
• Multipurpose
• Auditory
19. Intro to Measurement Systems
Main reasons for sound system measurement?
• Maintenance
• Legal
• Artistic
20. Intro to Measurement Systems
5 basic test signals
• White Noise
• Pink Noise
• Shaped Noise
• Sine Waves
21. Intro to Measurement Systems
What is white noise?
Equal energy / frequency
22. Intro to Measurement Systems
What is pink noise?
Equal energy / octave
23. Intro to Measurement Systems
2 most common weighting curves for SPL meters?
A & C
24. Intro to Measurement Systems
Dimension RTA is missing?
Time
25. Intro to Measurement Systems
What is Fourier Transform?
Mathematical calculation converts: (amplitude vs time) into (amplitude vs frequency)
26. Intro to Measurement Systems
What measurement systems use FFTs?
• SIM
• SMAART
27. Intro to Measurement Systems
What does TEF stand for?
Time Energy Frequency
28. Intro to Measurement Systems
What does MLS stand for?
Maximum Length Sequence
29. Polarity-Phase
Define polarity.
A source or signal is either pushing positive or negative
30. Polarity-Phase
Phase in 4 words?
Frequency Dependent Time Delay
31. Polarity-Phase
3 ways to reverse polarity?
• Swap pins 2 & 3 on cable
• reverse speaker wiring
• Polarity switch or settings (console)
32. Polarity-Phase
Two signals of equal amplitude at 0º offset will result in?
6 dB of coupling
33. Polarity-Phase
Two signals of equal amplitude at 180º offset will result in?
Full cancellation
34. Polarity-Phase
Two signals at equal amplitude at 120º offset will result in?
Neither cancellation or coupling.
35. Polarity-Phase
Trace angled to the left is:
Lagging
36. Polarity-Phase
Trace is angled to the right:
37. Polarity-Phase
Trace angled straight up and down is:
Wrapping
38. Polarity-Phase
How many milliseconds of delay would each of these speaker drivers require to be in time
• high = 4.5ms
• mids = 3ms
39. Acoustical Studies II
Advantages of parametric EQ over graphic EQ?
40. Acoustical Studies II
What is complimentary EQ?
• Creating the opposite in gain
• Matching the bandwidth
• Matching the center frequency
41. Acoustical Studies II
What is error in center frequency?
When the center frequency of the anomaly and the center frequency of the correction do not match
42. Acoustical Studies II
What is error in bandwidth?
When the bandwidth of the anomaly and the bandwidth of the correction do not match
43. Acoustical Studies II
What is comb filtering?
Two signals arriving at different times near equal amplitude causing cancellation of linear frequencies
44. Acoustical Studies II
Two independent factors that determine the magnitude and frequency response of comb filtering?
• Time offset
• Level offset
45. Acoustical Studies II
Calculate comb filtering?
• f = 1/t
• f - frequency spacing
• t - time offset in ms
• To find 1st null, divide frequency spacing by 2
46. Acoustical Studies II
Why is it called comb filtering?
On a linear scale, it looks like the bristles of a comb
47. Acoustical Studies II
Actions to reduce comb filtering?
• Gate
• Delay
• Level offset
• High pass filters
48. Acoustical Studies II
Why are EQs blamed for poor results when trying to correct comb filtering?
It is a time problem, it cannot be corrected with frequency
49. SIM Multi
How many mics can you input to 1 mic switcher?
8
50. SIM Multi
Branch Measurement Points?
• Console
• Processor
• Mike
51. SIM Multi
3 frequency responses in a branch?
• Processor
• Speaker + room
• Result
52. SIM Multi
What does LONAXN mean?
Left, On Axis, Near
53. SIM Multi
ROFFAXF
Right, Off Axis, Far
54. SIM Multi
2 variables for a primary mic placement?
• +/- 10º On axis
• Center of listening area
55. SIM Multi
What is an inverted processor?
• An upside down EQ
• A cut looks like a boost
• A boost looks like a cut
56. SIM Multi
What is Single System?
You are measuring one system at a time, the other systems are muted
57. SIM Multi
What is Lobe Study?
The primary system you are studying is muted and you are looking at other systems interacting
58. SIMII
What applications is SIM 2.0 Lab Mode used for?
Standalone measurement and research
59. SIMII
How do you properly patch for SIM II 2.0 Lab Mode?
Drawing is still on the board
60. SIMII
What are the status panels?
Information Windows at the Bottom of the Screen
61. SIMII
Data rejected means?
One of the Ports has reached OVERLOAD
62. SIMII
2 windows in spectrum mode?
• Reference
• Measurement
63. SIMII
Dimensions in the Delay Finder screen?
Relative Amplitude vs. Time Bottom window 10x magnification of the top window
64. SIMII
FIFO stands for?
First In First Out
65. SIMII
Hotkeys for trace offset?
( + , - ) keys
66. SIMII
Hotkey for Pink Noise
Alt + G
67. SIMII
AutoSet Delay hotkey?
F3
68. SIM Integration
7 steps to analyze a stereo system?
• 1. Preliminary preparations
• 2. Interfacing SIM with the sound system
• 3. Initial testing
• 4. Testing for harmonic distortion
• 5. Finding the delay offset
• 6. Initial EQ
• 7. Adding the systems together
69. SIM Integration
What type of mic is used for acoustic measurement?
Omni-directional
70. SIM Integration
What happens when a measurement mic is angled 90º from the source?
At 5kHz and above it starts to roll off
71. SIM Integration
Where should secondary mic be placed?
Anywhere in the listening area
72. SIM Integration
Typically, where should we not place the measurement mic?
• Near walls or pillars
• Exact center of rooms
• In the aisles (except in some line array situations)
73. SIM Integration
When should we use sitting height for the measurement mic position?
In recording studios & for front fills
74. SIM Integration
Why does Auto-EQ not work?
Because it's blind
75. SIM Integration
What are the initial EQ considerations in a studio?
• The sweet spot must be wide enough for both ears
• Pay close attention to the S/N or Coh
• Only EQ for Low Q problems, don't worry so much about the High Q issues
76. SIM Integration
Which company manufactures the Galileo?
Meyer Sound
77. SIM Integration
Name of the software used with the Galileo?
Compass
78. SIM Integration
What kind of cable is used to connect Galileo to the measurement system?
SIM BUSS cable
79. SIM Multi
Label the 6 traces of the following
• 1/processor
80. SMAART
Who developed SMAART?
Sam Berkow
81. SMAART
Who owns & markets SMAART now?
Rational Acoustics
82. SMAART
External hardware needed for SMAART?
• Mic
• Sound card (recommended)
83. SMAART
Info that must be entered in Spectrum Measurement Config Window?
• Input
• Device
84. SMAART
Info to be entered in Transfer Measurement Window?
The pair of inputs you wish to compare
85. SMAART
2 operational modes for SMAART?
• Real time
• Impulse response
86. SMAART
2 measurement plot types that can be viewed within SMAART's spectrum mode?
• RTA
• Spectrograph
87. SMAART
2 measurement plot types that can be viewed in SMAART's transfer mode?
• Phase
• Magnitude
88. SMAART
Hotkey to save trace information?
Spacebar
89. SMAART
Hotkey to turn generator on/off?
G
90. SMAART
What point does SMAART use accumulators rather than FIFO?
Above 16 averages (1 sec, 2 sec, etc)
91. Acoustical Studies III
What is reverberation?
Sound that lingers in a room after signal is turned off
92. Acoustical Studies III
What is ITG?
Initial Time Gap
93. Acoustical Studies III
Who was Wallace C. Sabine?
• Founded field of architectural acoustics
• RT60 formula
94. Acoustical Studies III
What is RT60?
The time it take a sound to decay 60 dB
95. Acoustical Studies III
Sabine's classic equation for RT60?
RT60 = 0.049V/Sa
96. Acoustical Studies III
How to calculate volume?
Volume = LxWxH
97. Acoustical Studies III
How do you caculate for S?
Multiply each surface by its two dimensions, then sum the all together
98. Acoustical Studies III
formula to calculate the average absorption coefficient of a room
• v= volume
• s= total surface
• -
• a= avg absorption coe
• Sn= surfacd area 1 side
• an= absorption coe 1 side
99. Acoustical Studies III
What changes are made to Sabine's equation when calculating for absorption of air?
Add +4mV to the denominator of the Sabine equation
100. Acoustical Studies III
Fitzroys equation
dont need to know
101. TEF
Who developed Theory of Time Delay Spectrometry?
Richard Heyser
102. TEF
Dimensions in an ETC curve?
• Amplitude
• Time
103. TEF
TEF gathers data in which domain?
Frequency
104. TEF
It takes _________ to measure time?
Frequency
105. TEF
It takes ____________ to measure frequency?
Time
106. TEF
Formula to calculate time window?
Bandwidth / Sweep Rate
107. TEF
It may be more convenient to set ________ and __________ and let the computer set sweep rate and bandwidth.
• Resolution
• Sweep time
108. TEF
How to calculate reflection from speaker to floor to microphone?
Pythagorean theorem
109. TEF
Why does TEF use 20microPascals for calibration?
Threshold of hearing
110. TEF
How does Schroeder Reverse Integration Curve calculate it's data?
From the right side of the screen back to the direct signal
111. TEF
Which two harmonics seem to do the most damage to the THD?
• 3rd
• 5th
112. 5.1 CAL
How can floating a panel help instead of mounting it?
Absorbs more low frequencies
113. 5.1 CAL
Most home theaters should have an RT60 of ________ sec from 200Hz to 2kHz.
0.2-0.4
114. 5.1 CAL
Center speaker should not be more than ______ feet from height of L/R speakers?
2
115. 5.1 CAL
Two types of rear surround speakers?
• Dipole
116. 5.1 CAL
Rear surround speakers should be at height of:
At least 6 feet
117. 5.1 CAL
Good way to determine subwoofer placement to reduce room modes?
Response
118. 5.1 CAL
Range for loudest sounds of a soundtrack?
105-110dB
119. 5.1 CAL
Range for quietest background effects on a soundtrack?
50-55dB
120. 5.1 CAL
3 companies that made 5.1 Audio Toolkit DVD?
• Goldline
• PMI
• Dolby
121. 5.1 CAL
What help is a multiplexer when doing 5.1 systems?
it allows multiple microphones to achieve "spatial-averaging"
122. SIM III
3 applications can SIM 3 be used for?
• Device analysis
• Speaker analysis
• Room analysis
123. SIM III
2 screens in the Freq. Response tab in the Group view?
• Result
• Processor/Room
124. SIM III
3 windows in the Band Spectrum screen. What is their significance?
• Console
• Processor
• Microphone
• Representing a single branch
125. SIM III
How many different modes available?
• Free Run
• Single System
• Lobe Study
• Combined Systems
• Show
• Mic EQ
• Console Check
• Mic Compare
126. SIM III
2 types of Spectrum Analysis views in SIM 3?
• Band spectrum
• Line spectrum
127. SIM III
What are the 2 screens shown in the Delay Finder tab?
• Processor amplitude
• Room amplitude
128. SIM III
Where do you toggle phantom power for SIM 3?
On the Front Panel tab
129. SIM III
• Ability to do multi-channel
• CD-ROM
130. SIM III
What role does the Galileo processor play in SIM 3 multi-channel?
It acts as the line switcher/processor in the SIM branch
131. SIM III
What function of the Galileo processor can be controlled from SIM 3?
Switching outputs (muting/un-muting)
132. EASE 2
Which module shows 3D mapping?
EYES
133. EASE 2
What symbol used for Acoustic Probe?
XYZ Axis man
134. EASE 2
Frequencies used for calculating RASTI?
500 HZ & 2 kHz
135. EASE 2
RASTI stands for?
Rapid Articulation Speech Transmission Index
136. EASE 2
%ALcons stands for?
Percentage of Articulation Loss of Consonants
137. EASE 2
In EASE, what does C stand for?
Clarity
138. EASE 2
What does C7 show?
Direct/Reverberant ratio
139. EASE 2
What does C50 show?
Speech intelligibility
140. EASE 2
What does C80 show?
Music intelligibility
141. EASE 2
Module that demonstrates sound transmission and reflections beings
scattered in a room showing SPL loss, orders of reflections and
propagation time of signals?
Ray tracing
142. NOISE CONTROL
HVAC?
Heating Ventilation Air Conditioning
143. NOISE CONTROL
Male carrier wave is between?
200-350Hz
144. NOISE CONTROL
What is normal in presence of noise?
We involuntarily raise our voices due to the noise level
145. NOISE CONTROL
What does NCB stand for?
Balanced Noise Criteria
146. NOISE CONTROL
Who developed NCB charts?
Dr. Leo Beranek
147. NOISE CONTROL
Recommended NCB for classroom?
30-40
148. NOISE CONTROL
What is transmission loss?
The loss of sound pressure through various materials
149. NOISE CONTROL
Residential constructon: Interior walls made of?
• 2 x 4's
• 16" on center
• 1/2" drywall both sides
150. NOISE CONTROL
How many layers of drywall will provide the greatest value for transmission loss?
2
 Author: wolffxfx ID: 218592 Card Set: AMS Fullsail Updated: 2013-05-24 19:50:24 Tags: AMS Fullsail Folders: Description: AMS Fullsail Show Answers: