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Understanding ratio with compression.
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UnderTow
Started Topics :
9
Posts :
1448
Posted : Jan 31, 2008 15:04
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Quote:
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On 2008-01-30 14:42, Trip- wrote:
PoM,
a sound source at -10dB level and the same sound source at -30dB level, will get a different treatment from a 'same threshold setting' compressor.
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He means with all settings the same but a different threshold.  That is why it is much more relevant to talk about the amount of gain reduction (compression) rather than the threshold.
PoM I know the level can make a difference in analogue compressors and in my experienceit also can make a difference in digital compressor that model analogue behaviour.
In general I find that things remain cleaner with most plugins if you keep all your levels relatively low. Allot of processors (analogue or digital) kind of fall to bits when the levels are too close to the maximum levels. Of course this can be used to good advantage if you are looking for a rough sound. Usually this works better in the analogue domain.
UnderTow
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Mike A
Subra
Started Topics :
185
Posts :
3954
Posted : Feb 1, 2008 09:41
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Quote:
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On 2008-01-29 08:29, Trip- wrote:
As you mentioned about low thresholds, a higher attack setting really reminds an exciter, which has raios below 1.
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expander*
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Trip-
IsraTrance Team
Started Topics :
101
Posts :
3239
Posted : Feb 3, 2008 16:26
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Quote:
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On 2008-01-31 15:04, UnderTow wrote:
Quote:
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On 2008-01-30 14:42, Trip- wrote:
PoM,
a sound source at -10dB level and the same sound source at -30dB level, will get a different treatment from a 'same threshold setting' compressor.
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He means with all settings the same but a different threshold. That is why it is much more relevant to talk about the amount of gain reduction (compression) rather than the threshold.
PoM I know the level can make a difference in analogue compressors and in my experienceit also can make a difference in digital compressor that model analogue behaviour.
In general I find that things remain cleaner with most plugins if you keep all your levels relatively low. Allot of processors (analogue or digital) kind of fall to bits when the levels are too close to the maximum levels. Of course this can be used to good advantage if you are looking for a rough sound. Usually this works better in the analogue domain.
UnderTow
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Gain reduction it is then, of course
Mike, expander, thanks for the correction.
 Crackling universes dive into their own neverending crackle...
AgalactiA |
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Psynaesthesian
IsraTrance Junior Member
Started Topics :
30
Posts :
557
Posted : Feb 5, 2008 09:34
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can someone reccomend a precise / good / affordable compressor with following characteristic :-
eg - compressor is placed in Bassline signal path and sidechained to Kick. In addition to the Sidechain compression with the kick, i want to process / compress the Bassline signal to make it stand out, all this using a single compression unit!!!
Any suggestions??? or am I dreaming too deep??
B'om Shankara!!!
"... b'om ..." |
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Boobytrip
IsraTrance Junior Member
Started Topics :
39
Posts :
988
Posted : Feb 5, 2008 12:52
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Try Voxengo's Crunchessor or Kjaerhus GAC-1 & GUP-1. Those do (stereo) side-chaining and saturation.
I found the graphs on compression in Bob Katz' Mastering Audio a very useful illustration of what a compressor does. Since i couldn't find them anywhere i reproduced them (sort of):
http://i238.photobucket.com/albums/ff120/boobytrip/compressor_effect.jpg
I used a wave-file which consists of white noise, varying in level from 0 dB to -10 dB (the upper audio event, 'noise_blocks'), which is transformed into the lower audio event ('noise_comped') by feeding it into a compressor with the following settings:
http://i238.photobucket.com/albums/ff120/boobytrip/noise_compressor_settings-10dB.jpg
You can clearly see the effects of:
-ratio and threshold: the 0 dB parts are 10 dB over the -10dB threshold and are reduced to exceed the treshold only by one-fifth(ratio of 5:1) of 10 dB, which is 2 dB over the threshold of -10 dB (which is -8 dB)
-attack and release: it takes time before compression is fully working (attack) and it takes time for the compression to stop working after the threshold is no longer exceeded (release). |
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Zoopy
IsraTrance Junior Member
Started Topics :
44
Posts :
538
Posted : Feb 8, 2008 06:34
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thanks boobytrip, super interesting.
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Boobytrip
IsraTrance Junior Member
Started Topics :
39
Posts :
988
Posted : Feb 8, 2008 13:06
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orbit
IsraTrance Full Member
Started Topics :
71
Posts :
108
Posted : Feb 8, 2008 16:12
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hey guys let me see if i got this right assuming we have quick attack and medium release. The amount a signal will get compressed will be the difference between the threshold and peak divided by the ratio number?? are these values right?
-20 DB threshold -10DB peak at 5:1 = -18db
-20db threshold -10DB peak at 2:1=-15DB
-16DB threshold -10db peak at 6:1 =15DB
-32DB threshold -8db peak at 8:1=-29db
-40db threshold -15db peak at 5:1= -35db
-40db threshold -15DB peak at 1:1- -40db
eeeek i hope im in the right direction
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orbit
IsraTrance Full Member
Started Topics :
71
Posts :
108
Posted : Feb 8, 2008 16:48
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whoops -40db threshold -15db peak at 1:1 would be -15db. the higher the ratio the more gain reduction you will get |
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Boobytrip
IsraTrance Junior Member
Started Topics :
39
Posts :
988
Posted : Feb 10, 2008 23:08
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Quote:
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On 2008-02-08 16:12, orbit wrote:
hey guys let me see if i got this right assuming we have quick attack and medium release. The amount a signal will get compressed will be the difference between the threshold and peak divided by the ratio number?? are these values right?
eeeek i hope im in the right direction
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Jah, that's all there is to it. The ratio is relative to the treshold. The thrshold just says: the heigth of everything above me will be divided by the ratio value. |
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