Acoustics

Reverberation (7)

The Music Telegraph | Text 2019/02/25 [12:06]
Acoustics

Reverberation (7)

The Music Telegraph| 입력 : 2019/02/25 [12:06]

▲ Behavior of Reverberation

©The Music Telegraph

 

 

 

Reverberation (7)

 

 

3. Body of reverb

 

As time passes,

 

1) Amplitude decrease

- The reverbs. (So called, 'body of reverb')

- ‘Nature of the Space’ determines RT60

 

*RT60 = Reverb Time

: The time it takes the reverberant energy to drop 60 dB in amplitude

 

▲ RT60

©The Music Telegraph

 

 

 

2) Frequency Content decreases

In general,

a) High Frequencies lost first, Mid frequencies lost next, Low Frequencies last to go

*cheap reverbs doesn’t calculate (Frequency content decrease Math) exactly like above

b) Small space: less Low Frequency content

Large space: less High Frequency content

 

 

3) Density increases

Over time, it gets thicker

Expensive effector -> 'thick'

Cheaper effector -> 'thin'

 

 

*When we use reverb, we can make (control) Ref./Abs. rate (Reflection/Absorption rate) by control different material (EQs)

ex) 'Window glass' setting  ==> Higher Frequency contents in reflections

 

 

What is the difference between cheaper and expensive reverb?

- Listen carefully after you press stop button

- You hear the ‘reverb tails’

=> More ‘real room’ sound? or simulated?

 

 

 

Perception by reverb:

1) Room size

2) Decor (stage setting)

3) Room Shape

 

 

 

 

[side trip]

‘Vocal Recording’

Acting mode => Over ‘emote’ before microphone

∵ Mic tends to decrease vocalist’s emotional voice/feeling

 

 

The Ref./ABs (absorption) nature of all materials is Frequency dependent

: No space has reverberant contents above 8 ~ 10 kHz

 

 

Sibilant effect in vocal

ref.) “In the Arms of Angel” (Sarah McLachlan) --> cut too much

 

 

  

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