ASSIGNMENT	
  5	
  
Samhita	
  Shiledar	
  
	
  
	
  
	
  
Hello	
  !	
  I’m	
  Samhita	
  Shiledar	
  from	
  India!	
  	...
What	
  is	
  Reverb???	
  
	
  
Reverb,	
  short	
  for	
  reverberation,	
  is	
  an	
  effect	
  that	
  is	
  comprise...
can	
  cause	
  your	
  bass	
  to	
  build	
  up	
  much	
  faster	
  than	
  algorithmic	
  reverbs.	
  
With	
  multipl...
COMPARISION:	
  
ALGORITHMIC	
  REVERB	
  	
   CONVOLUTION	
  REVERB	
  
Reverb	
  by	
  mathematical	
  formula	
  
attai...
COMMON	
  PARAMETERS	
  OF	
  REVERB:	
  
	
  
	
  
Early	
  Reflections	
   Usually	
  controlled	
  via	
  Room	
  type	...
 
	
  
	
  
	
  
	
  
	
  
	
  
	
  
	
  
Reverb	
  EQ	
   Usually	
  a	
  Highshelf	
  and/or	
  Lowshelf	
  EQ	
  with	
...
DEMONSTRATIONS:	
  
Below	
  are	
  the	
  demonstrations	
  on	
  Different	
  types	
  of	
  reverbs.	
  I	
  have	
  li...
 
	
  
	
  
TEXT	
  REFLECTION:	
  
This	
  weeks	
  assignment	
  was	
  challenging	
  for	
  me	
  foe	
  many	
  reasons.	
  First...
Reverb: Introduction to Music Production Assignment 5
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Reverb: Introduction to Music Production Assignment 5

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This is my try for assignment 5 of Coursera Music Production course. Due to last minute technical errors, I am linking the PDF of my work here.
Reference soundcloud clip:https://soundcloud.com/samhita-shiledar/reverb-assignment-5

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Reverb: Introduction to Music Production Assignment 5

  1. 1. ASSIGNMENT  5   Samhita  Shiledar         Hello  !  I’m  Samhita  Shiledar  from  India!     I  recently  completed  my  Chemical  engineering  and  working  in  same  field  now.  I   play  piano  and  sing  Indian  Classical  Music.     This  lesson  is  for  week  5  of  Introduction  To  Music  Production  at  Coursera.org   Topic  is-­‐  Compare  and  contrast  an  algorithmic  and  convolution  reverb.   Demonstrate  the  difference  and  the  important  features  in  both  types  of  reverb.   Hope  you  guys  enjoy  ;)                                            
  2. 2. What  is  Reverb???     Reverb,  short  for  reverberation,  is  an  effect  that  is  comprised  of  many  different   delayed  signals  which  creates  a  background  effect  that  is  similar  to  sound  in  a   room,  bouncing  around.     Reverberation  is  the  persistence  of  sound  in  a  particular  space  after  the  original   sound  is  produced.     Sound  in  a  room  is  reflected  by  different  things  present  in  surrounding.  Hence   some  waves  travel  a  longer  path  while  some  travel  shorter.  Hence,  there  is   difference  between  the  time  at  which  sound  reaches  receiver.     All  reverbs  will  have  a  dry/wet  mix  control,  which  will  control  output  signals  as   a  mix  between  the  dry  inputted  signal  and  the  wet  reverberated  signal   Two  common  uses  are  as  follows:   • To  make  instruments  sound  real  /  like  recordings  in  real  rooms   • To  apply  a  thickness  effect  or  a  “distance”  effect  (exaggeration)     CONVOLUTION  REVERB:   Convolution  reverbs  use  real  sound  samples,  recorded  from  real  rooms  (or   modified  but  based  on  real  recordings  in  some  cases)  known  as  “Impulse   Responses”.    They  use  multiple  microphones  to  capture  the  acoustics  of  a  room   and  produce  an  IR  file  for  you,  so  you  don’t  need  to  do  any  of  that.  (e.g.  bursting  a   balloon  and  recording  and  capturing  all  properties  using  3-­‐4  mics)   In  audio  signal  processing,  convolution  reverb  is  a  process  used  for  digitally   simulating  the  reverberation  of  a  physical  or  virtual  space.   Convolution  is  an  advanced  mathematical  equation  similar  to  cross-­‐correlation   that  produces  a  third  modified  version  which  leaves  an  overlap  that  can  be   utilized  to  create  this  reverb  effect.  These  can  be  real  spaces,  such  as  an   auditorium  or  exotic  places  such  as  a  famous  concert  hall.   An  important  feature  of  convolution  reverb  is  its  ability  to  mimic  a  variety  of   different  room  by  importing  lossless  audio  files.     One  common  problem  with  reverb  in  general  is  the  amount  of  bass  build  up  they   can  cause.    Convolution  reverbs,  using  their  impulse  response  files,  tend  to   exaggerate  the  impulse  response  from  your  sound.    This  is  the  initial  collision   between  a  sound  and  the  surrounding  material.    If  this  is  not  set  up  correctly,  it  
  3. 3. can  cause  your  bass  to  build  up  much  faster  than  algorithmic  reverbs.   With  multiple  instruments  playing  in  an  ensemble  this  can  cause  a  large  amount   of  muddiness.  Because  of  this  effect  and  the  CPU  effect,  it  is  recommended  to  use   convolution  reverbs  on  solo  instruments  only.       ALGORITHM  REVERB:   Digital  reverbs  can  use  algorithms  to  reproduce  natural  echoes  and  simulate  the   effect  of  reverberation.  The  definition  of  an  algorithm  is  a  simple  step-­‐by-­‐step   procedure  that  is  used  in  computer  programming  to  logically  outline  the  steps   the  computer  will  take  to  solve  something.   Algorithmic  reverbs  use  multiple  feedback  delay  circuits  which  creates  a   diminishing  series  of  sounds.  The  early  reflections  are  controlled  by  variables   such  as  room  size,  room  shape  and  stereo  controls.  The  reverb  time  is  generally   less  than  2ms.  The  computer  produces  a  reverb  sound  based  on  the  settings  on   these  controls  which  controls  the  variables  in  the  algorithm.                  
  4. 4. COMPARISION:   ALGORITHMIC  REVERB     CONVOLUTION  REVERB   Reverb  by  mathematical  formula   attained  by  inserting  values  of   different  parameters   Uses  real  samples  recorded  in  real   rooms   Customized   Not  customized   Less  creative   More  creative   Less  realistic   More  realistic   1.Recorded  acoustic  guitar  from  my   studio   2.Symphony  ensembles  that  I  (rarely)   want  to  add  more  space  to  (CineBrass,   Albion)   3.LA  Scoring  Strings  ensembles   4.Any  ambiances  in  a  track  (almost   never  use  my  convolution  reverb  on   this)     1.Live  guitar  through  an  amp   simulator  (Guitar  Rig)   2.Programmable  Synths  (Massive,   FM8,  Absynth)   3.Electronic  /  Hip-­‐Hop  style  snare   drums   Arts  Acoustic  Reverb   Use  Reflector,  especially  if  you’ve   already  bought  Complete  from  Native   Instruments.   Analogous  to  synthesizer   Analogous  to  sampler   More  parameters  that  can  be  changed   Very  few  parameters  to  play  with                      
  5. 5. COMMON  PARAMETERS  OF  REVERB:       Early  Reflections   Usually  controlled  via  Room  type  and/or  Room   Size  parameters.   The  EARLY  REFLECTIONS  enable  the  human  brain  to   quickly  identify  the  room  size.  They  are  therefore  the   most  critical  part  of  a  reverb  effect,  if  a  room  simulation  is   the  goal.     Room  Size   How  big  the  room  is.  This  determines  the  time  after  which   sound  will  reflect.   Dry  Wet  balance   dry  means  that  it  is  free  from  processess  such  as   reverb,delay,chorus  or  other  effects,  in  its  raw   form.  WET  means  it  has  effects/processes  on  it.   Predelay   Parameter  Range  :  0  to  x  milliseconds   Time  between  Direct  Signal  and  start  of  Reverb  portion.   The  more  space  between  you  and  walls  or  other  reflective   objects,  the  greater  the  Predelay.     Reverb  Time   Parameter  Range  :  0.1  to  x.x  seconds   The  greater  the  enclosed  volume  of  the  space  you're  in,   the  longer  the  reverb  time.  This  is  of  course  true  only  to  a   certain  extent.  The  larger  the  room  or  chamber,  the  louder   your  source  signal  needs  to  be  to  produce  any  significant   level  of  reverb  tail.     Mix   How  much  reverbed  sound  is  there  in  output  in  terms  of     percentage.       Density   Density  of  air  where  you  are  recording.  
  6. 6.                   Reverb  EQ   Usually  a  Highshelf  and/or  Lowshelf  EQ  with  variable   Frequency.   These  EQs  are  only  applied  to  the  output  of  the  reverb  or   perhaps  even  just  the  reverb  portion  of  the  Reverb  effect.   Some  reverbs  have  Highshelf  and  Lowshelf  EQs  for  the   Early  Reflections  as  well.   Logic  has  high  cut  option.    
  7. 7. DEMONSTRATIONS:   Below  are  the  demonstrations  on  Different  types  of  reverbs.  I  have  linked  a   soundcloud  file  alongwith.  Listen  to  it  and  see  how  different  parameters  affect   the  output.  1st  loop  is  original  track  and  later  ones  have  settings  as  below.  (on   order)     Just  a  small  preface:  I  have  imported  a  guitar  loop  to  audio  track  in  Logic  pro  9   and  added  ‘Reverb’  in  Inserts  on  Channel  strip  of  Mixer.  2,3  are  convolution   reverbs  (Space  Designer)  (Choir  hall  and  Guitar  hall  large  respectively)  and  last   three  are  algorithmic  reverbs  (GoldVerb).  All  the  reverbs  are  inbuilt  in  Logic  Pro   9.        
  8. 8.      
  9. 9. TEXT  REFLECTION:   This  weeks  assignment  was  challenging  for  me  foe  many  reasons.  First,  it  took   long  to  complete  video  lectures.  And  secondly  I  am  so  new  to  this  field  that  I  am   moving  very  slowly.  It  took  hard  to  understand  the  difference  between   processed  and  original  signal  for  me.  So  had  to  struggle  a  lot.   As  there  was  word  limit,  I  could  not  cover  many  details  in  demonstrating  and   assumed  that  now  we  know  how  to  add  inserts  and  all.  I  sould  have  kept  some   place  for  it  and  told  it  may  be.  Anyway,  all  depends  on  your  feedback.  Let  me   know  how  you  find  this  assignment.  Suggestions  are  welcomed  J  

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