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112 Cards in this Set
- Front
- Back
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What is Phase?
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Frequency Dependant time delay
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If the C3 note is at 130hz, what is the 4th harmonic of that note ?
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520hz
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What is the fundemental Octave above 2khz
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4Khz
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What are the basic test signals used for sound system measurement?
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Sine wave sweep,White noise, Pink Noise, Broadband Pulse, Shaped Noise
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White noise is?
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Equal Engery per frequency
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Pink Noise is?
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Equal energy per octave
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What are the two most commonly used weighting curves for spl meters?
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A and C
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A RTA HAS HOW MANY Dimiensions and how many ports?
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2 demensions and 1 port
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Phase correction is used?
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To correct for time alignment issues
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Amplitude correction is used?
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To boost or cut frequencies to correct deffiecncies in a cabinent
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Name two side effects thst maybe seen by refuucing the LF Amplifier gain?
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Crossover points wil shift, and Possible Phase misalignment
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Which screen displays the difference between the reference and Measurement channels in the frequency domain?
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Freqeucy Response
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Which screen computes and displays the amplitude response of the measured system in the time domain
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Delay finder
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The Sim II 2.0 lab software is used primariy for what two Applications?
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Stand Alone measurement and research
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What is the Hotkey to turn on the generator Noise
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Alt G
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In the data status Pannel, Note will only show how many characters from the Notepad?
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10
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Data Rejected in the overall status panel means?
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Overload
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What are the two windows in spectrum and what two dimensions do they display?
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Reference and Measurement, Amplitude Vs. Frequency
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In Delay finder, what is the hotkey for the Autoset delay
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F3
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In Delay finder what does the lower screen display copared to the upper screen?
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10 times the Maginfication of the relative Amplitude Vs time
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the 3 traces of a Frequency Response? (top to bottom)
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Signal to Noise, Frequency response, Phase
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What does SIM stand for?
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Source Independant Measurement
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What does MLS stand for?
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Maxium Legenth Sequence
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Under the setup menu, In reference channel, there is a choice of two setups. which are?
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Input or Generator
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What are the Advantages does a paramentric Eq have compared to a grapic EQ?
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Adjustable bandwidth and Center Frequecy
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What are the two independant factors that determine the magnitude and frequency response of comb filtering?
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Time and Level Offset
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Why is it called Comb Filtering
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Viewing it on a linear Scale it looks liek the Bristles of a comb
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Exaples of typical causes of comb Filtering
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DI and Mic Interaction, Reflection
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SIM 2.3 Stereo software is used primarily for what two Applications
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Recording studios and Stereo Soundsystems
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Red Trace color means?
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Signal to noise
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Green Trace color means?
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Inverse EQ
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Blue trace color means?
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Result
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White Trace color means?
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Room to speaker
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Orange trace color means
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Orignial EQ
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Name two Fuctions that are disabled when you enter show Mode?
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single system and preset
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What are the two menu changes could you make to help prevent Blanking?
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Averages and Smoothing
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Primary Mic Position
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+/- 10 on axis and Center of Coverage
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6 traces from 2.3 (from top to Bottom)
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S/N, Result, S/N of EQ or 1/EQ, S/N of Room Speaker, Inverse EQ, Room + Speaker
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Name two key factors Effecting speaker interaction
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Time and Level Offset
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______Reflection acts as a split point source Array?
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Grazing
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_______Reflection acts as a split parallel Array
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Parallel
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___reflection acts as a sidefill monitor Array
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Rear Wall
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______Reflection acts as a point Destination Array?
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Corner
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Which Relflection is most favorable?
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Grazing
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Which reflection of the four is most commom?
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Parallel
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What is the Hotkey to toggle between Live and Memory Traces?
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f10
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In Sim lab mode, Under set menu, In the reference channel therre is a choice of two setups?
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Input and Gereator
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Type of curtain used?
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Eyebrow
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Name the person that created the SMART software?
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Sam Berkow
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What external Hardware does smart need for accoustic analisys of a speaker cabinent?
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Measurement mic and Mixer
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What are the Reference Registers?
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Memory Storage Areas
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What is Fixed Point Per Octacve
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1/24 octave resolution
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_____Topographical view of a waveform
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Spectograph
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What is the different generator settings that smart has available internally in the software?
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Pink noise and Red Sync
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What brand of Measurement mic do we use with Smaart?
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Earthworks M30
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What is the RT60?
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The time it takes a signal to decay after it has stopped
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Who was considered the "archetecutal accoustics?
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Wallace Sabine
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What is the formula to calculate the volume of a room?
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volume= l*w*h
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A stands for?
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Average absorption coeffiecnt
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Sn stands for?
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surface area of one side
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An stands for?
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absorption coeffiecent on that side
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S stands for?
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total surface area
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What changes are made to the Sabine equation to include weather
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+4MV
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Speech carrier wave produced by the vocal cords for male talkers is around?
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200-350hz
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What does NCB stand for?
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Balenced noise criteria
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What does Normal presence of noise mean?
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We Involentarily raise our voices because of the noise level
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Which two frequencies are used for calculating Rasti?
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500 and 2Khz
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What does RASTI stand for?
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Rapid Articulation Speech transmission Index
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%alcons stand for?
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Percentage of articulation loss of Consonants
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In ease for c50what does the c stand for?
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Clarity
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what does c50 show
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Speech intelligibity
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One module in ease demonstrates sound transmission and reflections being scattered, showing the loss of SPL, that module is named?
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Ray tracing
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What accoustical help can "floating" an absorption panel do instead of mounting it?
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Absorbs more low frequencies, Not just mids and Highs
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Most Home theaters should have an RT60 of ____seconds from 200hz to 2khz
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2-4 seconds
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The center speaker should not be more than ____
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2 feet
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What types of speakerers discussed are used for rear surround sound?
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Dipole and Direct radiating
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Rear surround speakers should br at a height of
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Atleast 6ft
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What is a grood way to determine the subwoffer palcement to reduce room modes?
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Use RTA, Move subwoffer till you have the flatest response
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What should be the range for the loudest sounds of a soundtrack
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105-110dB
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What be the range for the quietest background effects of a soundtrack?
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50-55dB
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What are the three companies made the 5.1 audio toolkit?
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Goldline, PMI, dOLBY
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What help is a multiplexer when doing 5.1 system?
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It allows multiple microphones to achive spatial - averaging
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Who developed the theory of time delay spectormetry
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Richard Heiser
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WHich company first commercially distrubuted TEF to the industry?
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Crown International
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Which company currently owns TEF patent and distribution
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Gold LINE
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What kind of connectors does TEF ave for line Input and Mic Input
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2 BNC and 2XLRS
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What kind of Cable Connections will TEF do to the host computer?
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Serial, Parallel, USB/ Parallel
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What does TEF stand for?
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Time Energy Frequency
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What deminsions are in an ETC curve?
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Amplitude vs Time
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The TEF system gathers its data in which domain?
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Frequency
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It takes ___ to measure time and it takes _____to measure freqeuncy
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Freqeuncy and time
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What voltage should you not exceed when doing electrical measurements
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1.7 volts
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What is the formula to calculate the time window?
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Bandwidth/ sweep rate
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How do you calculate the amount of time sound travels when you know the distance?
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D/C=T
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How do you calculate the distance sound travels?
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d=t*c
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d stands for?
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Distance
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T stands for?
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tIME
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c STANDS FOR?
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Speed of sound
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What is the time distance window
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The bubble around Microphone and speaker that is created by your choice of parameters
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It may be much more convienient to set a ___ and ____ and let the computer set the sweep rate and bandwidth for us?
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Resolution and sweep time
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How do you calculate te total distance of a reflection from a speaker to the floor to microphone?
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a2+b2=c2 then c+C
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What kind of calibrator do we use with TEF?
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Lanson Davis CAC 200
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Why does TEF USE 20 pascals for calibrating the unit?
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it is the threshold of hearing
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What kind of microphone do we use with the TEF?
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Gold Line MK 10
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How does the shroder reverse intergration curve calculate its data?
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From the right side of the screen back to the direct signal
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Acoustic distortion affects three Psycoacoustic perceptions which are?
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Imaging, Spartial impressions and frequency response
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Which two harmonics seem to do the most damage to the THD?
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3rd and 5th
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What is THD+N?
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Total harmonic distortion +Noise
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How does Hrmonic tracking work?
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Instead of tracking the fundemental, it tracks the harmonic
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In a 3d waterfall display, you have to set the ____and ____time and the amount of ___to inlude
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Start stop and steps
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Polar measurement maybe transferred for further use to which software?
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Ease
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Three types of room modes?
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Axial, tangental, Oblique
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