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AVIXA CTS-D: Human Perception of Sound Exam Study Guide.
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AVIXA CTS-D: Human Perception of Sound Exam Study Guide. Logarithm - answeris the exponent of base 10 that equals the value of a number Decibel - answerdescribes a base-ten logarithmic relationship of a power ratio between two numbers. -It uses a logarithmic scale to describe ratios with a ver...

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  • August 27, 2024
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©THEBRIGHT EXAM STUDY SOLUTIONS 8/27/2024 12:01 PM



AVIXA CTS-D: Human Perception of Sound
Exam Study Guide.

Logarithm - answer✔✔is the exponent of base 10 that equals the value of a number

Decibel - answer✔✔describes a base-ten logarithmic relationship of a power ratio between two
numbers.
-It uses a logarithmic scale to describe ratios with a very large range of values that can vary over
several orders of magnitude.
-It is also used for quantifying differences in voltage, distance and sound pressure as they relate
to power.

Decibels can measure what type of values? - answer✔✔Distance, Power, Pressure, or Voltage

Pascal - answer✔✔SI Unit for Pressure

Decibel Formula for Power - answer✔✔dB = 10 * log (P1 / Pr)


Where:


dB = The change in decibels
P1 = The new or measured power measurement
Pr = The original or reference power measurement


if result is positive, the result is an increase, or gain. If it is negative, the result is a decrease, or
loss.

Decibel Formula for Distance - answer✔✔dB = 20 * log (D1 / D2)


Where:

, ©THEBRIGHT EXAM STUDY SOLUTIONS 8/27/2024 12:01 PM


dB = The change in decibels
D1 = The original or reference distance
D2 = The new or measured distance


This as the same as:
db= 10 * log (D1²/D²)

Decibel Formula for Voltage - answer✔✔dB = 20 * log (V1 / Vr)


Where:


dB = The change in decibels
V1 = The new or measured voltage
Vr = The original or reference voltage


db = 10 * log (V1²/V2²)

Reference Level Sound Pressure: 0 dB SPL in Pascals - answer✔✔.00002 Pa / 2x10^-5 Pa / .02
mPa @ 1kHz

Reference Level Voltage (Consumer Electronics): 0dBV in Volts - answer✔✔1 V

Reference Level Voltage (pro AV): 0 dBu in Volts - answer✔✔0.775 V

Reference Level Power: 0 dBW in Watts - answer✔✔1W

Reference Level Power: 0 dBM in milliwatts - answer✔✔1 mW / .001W

Explain negative decibel values - answer✔✔measurement just means "less than before," or in
this case, "less than the reference level. It does not mean the basic unit it represents has a
negative value

Hearing Damage Threshold in dB - answer✔✔120 - 140 dB

Pro-Audio line level in dBu and volts - answer✔✔+4dBu and 1.23 Volts

Consumer Line Level in dBV and milllivolts - answer✔✔-10dBV, 316 mV

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