AV Calculators & Resources
Sound, design and lens calculators designed to simplify those complex equations
REFERENCES
U.S. Frequency Allocations
Click here to access the National Telecommunication and Information Administration’s United States Frequency Allocations table referenced in the July 2006 “Frequency Selection” Cheat Sheet.
SOUND SYSTEM DESIGN TOOLS
These calculators take the uncertainty out of equations common to designing an acoustically reliable sound system.
Constant Voltage Transformer Power Delivered
www.crownaudio.com/apps_htm/designtools/cv-xform-pwr.htm
dB Power Ratio
www.crownaudio.com/apps_htm/designtools/db-power.htm
dB Voltage Ratio
www.crownaudio.com/apps_htm/designtools/db-volts.htm
Amplifier Power Required
www.crownaudio.com/apps_htm/designtools/elect-pwr-req.htm
Inverse Square Law
www.crownaudio.com/apps_htm/designtools/inverse-square-law.htm
Line Loss
www.crownaudio.com/apps_htm/designtools/line-loss.htm
Ohm’s Law/Watt’s Law
http://ourworld.compuserve.com/homepages/Bill_Bowden/ohmslaw.htm
Wavelength Calculator
www.mcsquared.com/wavelength.htm
Speech Intelligibility
www.mcsquared.com/ssdesign.htm
Critical Distance
www.mcsquared.com/critical.htm
Quickie Reverb Time Calculator
www.mcsquared.com/rt60aa.htm
Constant Voltage Calculator
Click the link below to access this calculator from NSCA and Pro AV’s “Constant Voltage Loudspeaker Systems” Tech Tutorial.
www.proavmagazine.com/flash/CVCalc.xls
DISPLAY SYSTEM DESIGN TOOLS
The following calculators provide information for selecting the best products for display system design, and are handy for any presentation application.
Selecting Front Projection Screens
www.da-lite.com/education/guide.php?page=10
Viewing Distance vs. Screen Size
www.mcsquared.com/images1.htm#size
TCO Calculator
http://www.necdisplay.com/solutions/tco/nec_tco.htm
Projector Calculator
www.nectechmedia.com/throw/throw.htm
LENS CALCULATORS
These calculators simplify the process of determining the correct lens for many applications, and can provide the information you need with a minimum of known variables. These calculators are helpful for any surveillance, network video, IMAG, or CCTV application.
Object Dimension, Object Distance, Focal Length
www.canon.com/bctv/calculator/calculator3.html
Angle of View
www.canon.com/bctv/calculator/calculator1.html
Depth of Field
www.canon.com/bctv/calculator/calculator2.html
