AVIXA CTS-D: Human Perception of Sound (Questions & Answers) Rated 100%
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Course
AVIXA CTS-D: Human Perception of Sound
Institution
AVIXA CTS-D: Human Perception Of Sound
Logarithm - is the exponent of base 10 that equals the value of a number
In decibel formulas how should values be logically arranged when comparing two numbers (V1 / V2) -
If you expect a gain, place the higher number first. If you expect a loss, place the smaller number
first.
Explain negative...
Logarithm - is the exponent of base 10 that equals the value of a number
In decibel formulas how should values be logically arranged when comparing two numbers (V1 / V2) -
If you expect a gain, place the higher number first. If you expect a loss, place the smaller number
first.
Explain negative decibel values - 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
Decibel - 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? - Distance, Power, Pressure, or Voltage
Pascal - SI Unit for Pressure
Decibel Formula for Power - 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 - dB = 20 * log (D1 / D2)
Where:
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 - 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 - .00002 Pa / 2x10^-5 Pa / .02 mPa @ 1kHz
Reference Level Voltage (Consumer Electronics): 0dBV in Volts - 1V
Reference Level Voltage (pro AV): 0 dBu in Volts - 0.775 V
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