lec 4- reverb and echo

Question 1

what is reverberation?

Answer 1

-it is when sound is either reflected so many times that no single, discontinuous repeat of the source is percieved or when the reflective surfaces are too near the listener to allow subjective aural seperation

-prolongation of sound, resonance

Question 2

what is echo?

Answer 2

occurs when sound source is distinctly reproduced, may be single or multiple depending on how sound bounces

Question 3

what causes the reverb tail of slow sound decay?

Answer 3

the absorption of the sound energy, loss of energy

Question 4

what is the ideal amount of time for reverb?

Answer 4

1.5 to 2.5

Question 5

what is reverb time?

Answer 5

the time it takes for a sound to die away to a level 60 decibels below its original level

Question 6

how does sound behave?

Answer 6

-it bounces off of walls
-in a curved room, it comes back to one spot

Question 7

what is the rotunda effect?

Answer 7

when sound bounces off of the wall in a way where you can hear a whisper from one side to the other

Question 8

what are the 3 things that happen when a sound hits a surface?

Answer 8

-reflection: most of the sound is reflected, almost as loud as original
-absorption: absorbing power is determined by material used
-diffusion: scatters sound depending on desired effect

Question 9

what is sound diffraction?

Answer 9

when the sound gets split/scattered due to obstacles

Question 10

which sound wavelength is more directional?

Answer 10

-high wavelength, because less diffraction
-low has high diffraction

Question 11

what is chamber reverb?

Answer 11

putting sound into a space (e.g. sound out of a speaker into a cave to get reverb)

Question 12

what was the cheapest and most expensive way to make a sound reverb?

Answer 12

spring reverb and plate reverb

Question 13

what is the roomsize?

Answer 13

-controls overall characteristics of the reverb effect

Question 14

what is damping?

Answer 14

-the response of the early reflections and decay of the tail
-how much high freq. sound you lose

Question 15

what is input bandwidth?

Answer 15

tone control, small values cause muffling effect

Question 16

what is dry/wet signal level?

Answer 16

-determines the amount of original sound in the reverb

Question 17

what is early reflection level?

Answer 17

-echo effect

Question 18

what is tail level?

Answer 18

-a volume control that determines the amount of the hall effect of the reverb

Question 19

what reverb sounds the best?

Answer 19

convolution reverb, only possible with technology