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75 Cards in this Set
- Front
- Back
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What are the three distinct forms of particle motion?
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Cylindrical Wave
Transverse Wave Longitudinal Wave |
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How does temperature affect the velocity of sound?
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temp goes up, speed of sound goes up
temp goes down, speed of sound goes down |
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what is wavelength?
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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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divide 1130 by frequency
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How can you reverse polarity?
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Swap pins 2 and 3 on mic cable
swap + and - at speaker Reverse banana plug at amp |
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describe phase
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frequency dependent time delay
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How do you calculate octave relationships?
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2:1 ratio
A Doubling |
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How do you calculate harmonics?
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x - multipler of the fundamental
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what are the main reasons for sound system measurement.
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Maintenance
legal artistic |
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what 5 basic test signals are used for sound system measurement?
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White noise
Pink Noise shaped noise broadband pulse sinewaves |
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What is white noise
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equal energy per frequency
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What is pink noise
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equal energy per octave
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What are the 2 most common weighting curves used for spl meters?
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A and C
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what dimension is a real time analyzer missing?
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time
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What is the fourier transform?
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A mathmatical computation that converts amplitude vs time into amplitude vs frequency
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What measurement systems use FFTs
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SIM
Smaart |
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What does TEF stand for?
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Time
Energy Frequency |
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What does MLS stand for?
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Maximum length sequence
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What is an electronic crossover point?
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Where the low and high outpt of the processor crosses over
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What is an acoustic crossover point?
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When both drivers are driven at equal length
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What is amplitude correction
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boost in areas of frequency response to correct in effiencies of a speaker cabinet
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What is phase correction
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time alignment
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How do amplifier spec sheets denote voltage gain?
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DBvg
input sensitivity x multipler |
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what is power amplifier voltage gain?
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ratio of input to output voltage
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How do you match amplifier voltage gains
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potentiometers
DIP switches Front Panel Attractions |
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what applications is the SIM II V2.0 Lab used for?
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stand alone measurments and research
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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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What are the 2 windows in spectrum mode?
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reference and measurement
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what are the 2 windows in delay finder mode
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relative amplitude vs. time
10 xs the magnification |
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What are the 3 traces in the frequency response screen?
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signal to noise
frequency response phase |
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What 2 choices under the setup menu reference channel are you provided with?
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generator input
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What 2 choices under the setup menu measurement channel are you provided with?
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Output mic
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What is the hot key to turn the generator on?
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ALT + G
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Which frequency is typically used for measuring total harmonic distortion
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1k
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What is the hot key for the auto delay in the dely finder mode?
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F3
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What is sonic imaging
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bring show back on stage
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What is DUT
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device under test
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What is CEU
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Controlled Electronics Unit
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What are the obstacles to system optimization
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Speaker interaction
Reflections Dynamic Conditions |
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What are dynamic conditions
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Things that change:
-Temperature -Humidity |
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What are techniques for system optimization
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Architectual Modification
Speaker reasoning Electronic time delay Gain structure adjustment complimetary equalization |
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What are the tools for system optimization
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your ears
SIM system 2 High quality measurement micriphones |
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Where is the delay finder located
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Time domain
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What does FFT do?
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Changes Amp vs Time to Amp vs Frequency
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What is Air propogation
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1.13 feet per MS
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What does 1ms of time offset cause
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24-20 DB cancellation at 50hz
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HOw many branches are in 2.0
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16
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How many groups are in 2.0
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8
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What are the hot keys for Gain
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Shift:
F1 and F2 input F3 and F4 output F5 and F6 mic |
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What things are seen in the Delay Finder
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Propogation Delay
Phase Frequency Response Refliections |
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SIM stands for?
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Source Independent Measurement
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SIM was created by who?
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Meyer Sound
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The primary Developer was?
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Bob McCarthy
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SIM II is?
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an Analyzer capable of producing acurate high response data regarding response of system and compoinents
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What is frequency response?
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Difference between reference and measurement
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What screens are found in SIM 2.0
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Spectrum
delay finder frequency response |
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What color are live traces
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Bright colors
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What can affect S/N ratio?
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Room Noise
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What do steep filters cause?
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Phase shift at crossover point
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All frequencies except lows travel at the same rate in air, true or falseq
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true
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At 120 degrees there is no ______.
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Coupling
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When in phase you are looking for what?
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Smiley Face
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What are power amps/
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Increase line level audio signals to a power suitable for driving loudspeakers
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What is the range of acceptable DBvg
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20-45 volts
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What is an acceptable voltage in?
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0-2 volts
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What is an acceptable voltage out
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0-50 volts
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What does voltage gain do?
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Determines input signal required to drive a given output level
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What is Voltage gain range
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Ratio of input to output voltage
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What does voltage range determine
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determines amount of inut voltage required to bring the amplifier to full power
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What is the EuroMeyer standard DBvg
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23 db
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What is the North/South american standard DBvg
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26db
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What are the dimensions of measurement systems?
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Time
Energy Frequency TEF |
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What is a single port?
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Send OR recieve
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What is a dual port?
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Send AND receive
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What are the cautions of RTAs
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frequeny resolution
Phase response Signal to noise ratio temporal discrimination Cant measure time |
