# Shared Flashcard Set

## Details

AUDIO MEASUREMENT SYSTEMS
FINAL EXAM only POST MIDTERM Study Cards
23
Engineering
07/29/2013

Term
 WHAT IS REVERBERATION?
Definition
 It is the sound that lingers in a room after the signal is turned off
Term
 WHAT IS THE ITG?
Definition
 Initial Time Gap
Term
 WHO WAS WALLACE C. SABINE?
Definition
 Founder of the Science of Architectural acoustics and developed the RT60 formula.
Term
 WHAT IS RT60?
Definition
 The amount of time it takes for sound to decay 60dB
Term
 WHAT IS SABINE’S CLASSIC EQUATION FOR RT60?
Definition
 Sā
Term
 WHAT IS THE FORMULA TO CALCULATE THE VOLUME OF A ROOM?
Definition
 Volume = length x width x height
Term
 HOW DO YOU CALCULATE FOR S (TOTAL SURFACE AREA)?
Definition
 Multiply each surface by its 2 dimensions then sum them all together.
Term
 WHAT IS THE FORMULA TO CALCULATE THE AVERAGE ABSORPTION COEFFICIENT OF A ROOM?
Definition
 ā = s1a1 + s2a2 + ….. + snanS
Term
 WHAT CHANGES ARE MADE TO THE CLASSIC SABINE EQUATION, WHEN CALCULATING FOR THE ABSORPTION OF AIR?
Definition
 Add +4mV to the denominator of the sabine equation.
Term
 V
Definition
 Volume
Term
 S
Definition
 Total Surface Area
Term
 ā
Definition
 Average Absorption Coefficient
Term
 Sn
Definition
 Surface area of one side
Term
 An
Definition
 Absorption coefficient of that side
Term
 WHO DEVELOPED THE THEORY OF TIME DELAY SPECTROMETRY?
Definition
 Richard Heyser
Term
 WHAT DIMENSIONS ARE IN AN ETC CURVE?
Definition
 Amplitude vs. Time
Term
 THE TEF SYSTEM GATHERS IT’S DATA IN WHICH DOMAIN?
Definition
 Frequency
Term
 IT TAKES __________ TO MEASURE TIME AND IT TAKES ________ TO MEASURE FREQUENCY.
Definition
 IT TAKES _frequency_ TO MEASURE TIME AND IT TAKES _time_ TO MEASURE FREQUENCY.
Term
 WHAT IS THE FORMULA TO CALCULATE THE TIME WINDOW?
Definition
 Bandwidth Sweep Rate
Term
 IT MAY BE MUCH MORE CONVENIENT TO SET A __________ AND __________ AND LET THE COMPUTER SET THE SWEEP RATE AND BANDWIDTH FOR US.
Definition
 IT MAY BE MUCH MORE CONVENIENT TO SET A _resolution_ AND _sweep time_ AND LET THE COMPUTER SET THE SWEEP RATE AND BANDWIDTH FOR US.
Term
 HOW DO YOU CALCULATE THE TOTAL DISTANCE OF A REFLECTION FROM A SPEAKER TO FLOOR TO MICROPHONE?
Definition
 a2 + b2 = c2 Then C + C
Term
 WHY DOES TEF USE 20μPASCALS FOR CALIBRATING THE UNIT?
Definition
 It is the threshold of hearing
Term
 HOW DOES THE SCHROEDER REVERSE INTEGRATION CURVE CALCULATE ITS DATA?
Definition
 From the right side of the screen back to the direct signal.
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