| 3 forms of particle motion? |
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Cylindrical
Transverse
Longitudinal |
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| Formula to calculate speed of sound knowing only the temperature? |
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| c = 49v(459.4 + degrees F) |
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| How does temp affect speed of sound? |
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Temp increases, so does speed of sound
Temp decreases, so does speed of sound |
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| The distance a wave travels to complete one cycle |
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| How do you calculate wavelength? |
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| How do you calculate octave relationships? |
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2:1 ratio
Doubling of halving |
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| How do you calculate harmonics? |
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| Multipliers of the fundamental |
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| Formula to calculate a range of octaves? |
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| Types of room input methods other than vertex by vertex? |
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Extrude
Insert 3D shape
Load a prototype |
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| 5 types of 3D shapes you can insert? |
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Cylinder
Cuboid
Cupola
Cone
Pyramid |
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| Interior surfaces are what color? |
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| Most rooms modeled in negative axis. Why? |
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| That’s the way speakers are facing when inserted |
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| Command for cutting a face into 2 faces? |
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| Delete Unattached Vertices hotkey? |
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| When adding floor to ceiling columns, you must: |
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| What are some of the prototypes available? |
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Church
Stadium
Amphitheater
Gothic dome
Tricue
Station
Redoubt
Theater
Shell
Multipurpose
Auditory |
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| Advantages of parametric EQ over graphic EQ? |
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Adjustable center frequency
Adjustable bandwidth |
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| What is complimentary EQ? |
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Creating the opposite in gain
Matching the bandwidth
Matching the center frequency |
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| What is error in center frequency? |
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| When the center frequency of the anomaly and the center frequency of the correction do not match |
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| What is error in bandwidth? |
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| When the bandwidth of the anomaly and the bandwidth of the correction do not match |
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| Two signals arriving at different times near equal amplitude causing cancellation of linear frequencies |
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| Two independent factors that determine the magnitude and frequency response of comb filtering? |
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| Calculate comb filtering? |
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f = 1/t
f – frequency spacing
t – time offset in ms
To find 1st null, divide frequency spacing by 2 |
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| Why is it called comb filtering? |
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| On a linear scale, it looks like the bristles of a comb |
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| Actions to reduce comb filtering? |
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Delay
Level offset
High pass filters |
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| Why are EQs blamed for poor results when trying to correct comb filtering? |
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| It is a time problem, it cannot be corrected with frequency |
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| 3 applications can SIM 3 be used for? |
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Device analysis
Speaker analysis
Room analysis |
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| 2 screens in the Freq. Response tab in the Group view? |
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| 3 windows in the Band Spectrum screen. What is their significance? |
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Console
Processor
Microphone
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Representing a single branch |
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| How many different modes available? |
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Free Run
Single System
Lobe Study
Combined Systems
Show
Mic EQ
Console Check
Mic Compare |
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| 2 types of Spectrum Analysis views in SIM 3? |
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Band spectrum
Line spectrum |
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| What are the 2 screens shown in the Delay Finder tab? |
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Processor amplitude
Room amplitude |
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| Where do you toggle phantom power for SIM 3? |
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| Most significant upgrade made to SIM 3 from SIM II? |
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Ability to do multi-channel
CD-ROM |
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| What role does the Galileo processor play in SIM 3 multi-channel? |
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| It acts as the line switcher/processor in the SIM branch |
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| What function of the Galileo processor can be controlled from SIM 3? |
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| Switching outputs (muting/un-muting) |
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| How many mics can you input to 1 mic switcher? |
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| Branch Measurement Points? |
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| 3 frequency responses in a branch? |
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Processor
Speaker + room
Result |
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| 2 variables for a primary mic placement? |
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+/- 10? On axis
Center of listening area |
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| What is an inverted processor? |
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An upside down EQ
A cut looks like a boost
A boost looks like a cut |
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| You are measuring one system at a time, the other systems are muted |
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| The primary system you are studying is muted and you are looking at other systems interacting |
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| 7 steps to analyze a stereo system? |
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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 |
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| What type of mic is used for acoustic measurement? |
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| What happens when a measurement mic is angled 90? from the source? |
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| At 5kHz and above it starts to roll off |
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| Where should secondary mic be placed? |
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| Anywhere in the listening area |
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| Typically, where should we not place the measurement mic? |
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Near walls or pillars
Exact center of rooms
In the aisles (except in some line array situations) |
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| When should we use sitting height for the measurement mic position? |
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| In recording studios & for front fills |
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| Why does Auto-EQ not work? |
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| What are the initial EQ considerations in a studio? |
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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 |
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| Which company manufactures the Galileo? |
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| Name of the software used with the Galileo? |
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| What kind of cable is used to connect Galileo to the measurement system? |
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| Main reasons for sound system measurement? |
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White Noise
Pink Noise
Broadband Pulse
Shaped Noise
Sine Waves |
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| 2 most common weighting curves for SPL meters? |
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| Dimension RTA is missing? |
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| What is Fourier Transform? |
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| Mathematical calculation converts: (amplitude v. time) into (amplitude v. frequency) |
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| What measurement systems use FFTs? |
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| A source or signal is either pushing positive or negative |
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| Frequency Dependent Time Delay |
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| 3 ways to reverse polarity? |
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Swap pins 2 & 3 on cable
reverse speaker wiring
Polarity switch or settings (console) |
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| Two signals of equal amplitude at 0? offset will result in? |
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| Two signals of equal amplitude at 180? offset will result in? |
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| Two signals at equal amplitude at 120? offset will result in? |
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| Neither cancellation or coupling. |
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| Trace angled to the left is: |
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| Trace is angled to the right: |
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| Trace angled straight up and down is: |
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| What applications is SIM 2.0 Lab Mode used for? |
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| Standalone measurement and research |
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| How do you properly patch for SIM II 2.0 Lab Mode? |
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| Drawing is still on the board |
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| What are the status panels? |
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| Information Windows at the Bottom of the Screen |
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| One of the Ports has reached OVERLOAD |
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| 2 windows in spectrum mode? |
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| Dimensions in the Delay Finder screen? |
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Relative Amplitude vs. Time
Bottom window 10x magnification of the top window |
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| Hotkeys for trace offset? |
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| Who owns & markets SMAART now? |
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| External hardware needed for SMAART? |
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Mic
Sound card (recommended)
Cabling/Adapters |
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| Info that must be entered in Spectrum Measurement Config Window? |
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| Info to be entered in Transfer Measurement Window? |
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| The pair of inputs you wish to compare |
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| 2 operational modes for SMAART? |
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Real time
Impulse response |
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| 2 measurement plot types that can be viewed within SMAART’s spectrum mode? |
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| 2 measurement plot types that can be viewed in SMAART’s transfer mode? |
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| Hotkey to save trace information? |
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| Hotkey to turn generator on/off? |
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| What point does SMAART use accumulators rather than FIFO? |
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| Above 16 averages (1 sec, 2 sec, etc) |
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| Sound that lingers in a room after signal is turned off |
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| Who was Wallace C. Sabine? |
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| Founded field of architectural acoustics |
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| The time it take a sound to decay 6 dB |
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| Sabine’s classic equation for RT60? |
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| How do you caculate for S? |
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| Multiply each surface by its two dimensions, then sum the all together |
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| What changes are made to Sabine’s equation when calculating for absorption of air? |
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| Add +4mV to the denominator of the Sabine equation |
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| Heating Ventilation Air Conditioning |
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| Male carrier wave is between? |
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| What is normal in presence of noise? |
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| We involuntarily raise our voices due to the noise level |
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| Who developed NCB charts? |
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| Recommended NCB for classroom? |
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| What is transmission loss? |
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| The loss of sound pressure through various materials |
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| Residential constructon: Interior walls made of? |
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2 x 4’s
16″ on center
1/2″ drywall both sides |
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| How many layers of drywall will provide the greatest value for transmission loss? |
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| Which module shows 3D mapping? |
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| What symbol used for Acoustic Probe? |
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| Frequencies used for calculating RASTI? |
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| Rapid Articulation Speech Transmission Index |
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| Percentage of Articulation Loss of Consonants |
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| In EASE, what does C stand for? |
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| Module that demonstrates sound transmission and reflections beings scattered in a room showing SPL loss, orders of reflections and propagation time of signals? |
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| Who developed Theory of Time Delay Spectrometry? |
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| Dimensions in an ETC curve? |
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| TEF gathers data in which domain? |
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| It takes _________ to measure time? |
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| It takes ____________ to measure frequency? |
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| Formula to calculate time window? |
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| It may be more convenient to set ________ and __________ and let the computer set sweep rate and bandwidth. |
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| How to calculate reflection from speaker to floor to microphone? |
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| Why does TEF use 20microPascals for calibration? |
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| How does Schroeder Reverse Integration Curve calculate it’s data? |
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| From the right side of the screen back to the direct signal |
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| Which two harmonics seem to do the most damage to the THD? |
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| How can floating a panel help instead of mounting it? |
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| Absorbs more low frequencies |
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| Most home theaters should have an RT60 of ________ sec from 200Hz to 2kHz. |
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| Center speaker should not be more than ______ feet from height of L/R speakers? |
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| Two types of rear surround speakers? |
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| Rear surround speakers should be at height of: |
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| Good way to determine subwoofer placement to reduce room modes? |
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| Range for loudest sounds of a soundtrack? |
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| Range for quietest background effects on a soundtrack? |
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| 3 companies that made 5.1 Audio Toolkit DVD? |
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| What help is a multiplexer when doing 5.1 systems? |
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| It allows multiple microphones to achieve “spatial-averaging” |
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