lesson 2 - how sound is measured and just what is dynamic range Flashcards Preview

Low Voltage Year 3 - Test 5 > lesson 2 - how sound is measured and just what is dynamic range > Flashcards

Flashcards in lesson 2 - how sound is measured and just what is dynamic range Deck (16):
1

0 dBu is equal to ____ volts

.775

2

for musical application where high fidelity is the ultimate consideration how much headroom should be allowed

15-20 dB

3

headroom

the difference between nominal and highest levels in a program

4

how can a sound systems dynamic range be increased

increase max sound capacity or decrease ambient sound

5

gain

power increase of a signal
expressed in DB

6

why is headroom important

ability to handle loud program peaks

7

what devices permit compression to be applied above a set threshold

limiters

8

sound preassure

level measured per unit area of a particular location relative to sound source

9

0 dBv equals ________ volts

1

10

define volume

power level

11

what factors determine the head room needed

nature of program material
purpose

12

list two possible problems you could encounter if the dynamic range of the program material exceeds the dynamic range capability of the sound system

peak distortion
quiet passages not heard

13

what does the u in dBu stand for

unloaded

14

what is usually an adequate amount of headroom for most sound reinforcement systems

10dB

15

what does signal to noise ratio represent

difference between nominal level and noise floor

16

what does dynamic range represent

difference between loudest and quietest portion of a program