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原帖 由 希布 于 09-11-19 13:32 发表
整个dynamic procession time 的延迟,不明，可否有请详细拆分解说？
Compressor 里面的Lookahead 其实类似Reverb 里面的Pre-Delay，先设定延迟一定时间，效果器才开始做处理。
这算是一种特色功能，LA-2A、CL-1B 等都有中度的Lookahead。
所以当你转动Threshold 时，会感到作用时间好像跟旋纽不同步，就是因为这个延迟。
这个功能和Hold 一样都算是比较少见的，一般情况下Compressor 并不会加入Lookahead 或Hold。
原帖 由 希布 于 09-11-19 15:00 发表
虽然未能明确明白，但也有些模糊感觉！多谢antress指教！
当你转动Threshold 时，会感到作用时间好像跟旋纽不同步，就是因为这个延迟。再请问他是什么时候对什么功能旋纽起作用的呢？ATT，REL，THRESHOLD？ ...
这样说也许比较清楚。
假如你设定Reverb 的Pre-Delay 为500ms，那么Wet 的声音会在Dry 出现了500ms 后才跟着出现，不会跟Dry 同时出现。
Compressor 的 Lookahead 也是一样意思的。
假如你设定Compressor 的Lookahead-Delay 为300ms，那么压缩的效果会在第300ms 后才开始出现，也就是延迟了300ms 之后，Compressor 才开始作用。
In 1994, the digital brickwall limiter with look-ahead (to pull down peak levels before they happened) was first mass-produced
這裡有些資料可以參考 :-
Lookahead (Softube FET Comp)
The Lookahead can be used if the fastest attack time isn't fast enough, for instance if you want to apply some heavy limiting to a signal. The Lookahead will delay the signal path outside of the detector by up to 1 ms, leaving the detector signal unaffected. This has two effects:
1.The output signal will be delayed by up to 1 millisecond.
2.The detector will “see” the undelayed signal, but reduce the gain on the delayed signal. This means that the detector will be able to compress the signal before the actual transient comes (since the actual transient has been delayed).
The Lookahead time corresponds to the total latency of the plugin. The plugin will not report this latency to the host, since almost no hosts support compensating for a delay that depends on a parameter.
Some very fast Attack/Release settings will cause a “crackling” sound on transients, often sounding like some sort of digital clipping or saturation somewhere in the signal chain. This is very typical for this kind of compressor, but is usually an unwanted effect. The normal way to get rid of this “side effect” is to slow down the attack and release times but now you have another tool to use. By adding a little lookahead to the detector, many of these side effects can be avoided.
LOOK-AHEAD DELAY (TC MASTER X5)
Master X5 can look into the future, whenever this parameter is
active! This won’t help you fortune-telling, but it’ll help Master
X5 to be prepared for sudden peaks in your material, thus
ensuring a much better quality processing!
XO Wave's Compressor
The Limiter prevents the signal from ever going above a certain level. The simplest limiter design would simply "clip" the signal if it went above a certain level. This can create a very harsh sound, so XO Wave's Compressor has a "lookahead" feature which, by delaying the signal slightly, is much less noticeable. When driven to an extreme, however, no limiter can avoid clipping. Therefore it is important to use the Limiter carefully.
這裡有些資料可以參考 :-
Lookahead (Softube FET Comp)
The Lookahead can be used if the fastest attack time isn't fast enough, for instance if you want to apply some heavy limiting to a signal. The Lookahead will delay the signal path outside of the detector by up to 1 ms, leaving the detector signal unaffected. This has two effects:
1.The output signal will be delayed by up to 1 millisecond.
2.The detector will “see” the undelayed signal, but reduce the gain on the delayed signal. This means that the detector will be able to compress the signal before the actual transient comes (since the actual transient has been delayed).
The Lookahead time corresponds to the total latency of the plugin. The plugin will not report this latency to the host, since almost no hosts support compensating for a delay that depends on a parameter.
Some very fast Attack/Release settings will cause a “crackling” sound on transients, often sounding like some sort of digital clipping or saturation somewhere in the signal chain. This is very typical for this kind of compressor, but is usually an unwanted effect. The normal way to get rid of this “side effect” is to slow down the attack and release times but now you have another tool to use. By adding a little lookahead to the detector, many of these side effects can be avoided.
LOOK-AHEAD DELAY (TC MASTER X5)
Master X5 can look into the future, whenever this parameter is
active! This won’t help you fortune-telling, but it’ll help Master
X5 to be prepared for sudden peaks in your material, thus
ensuring a much better quality processing!
XO Wave's Compressor
The Limiter prevents the signal from ever going above a certain level. The simplest limiter design would simply "clip" the signal if it went above a certain level. This can create a very harsh sound, so XO Wave's Compressor has a "lookahead" feature which, by delaying the signal slightly, is much less noticeable. When driven to an extreme, however, no limiter can avoid clipping. Therefore it is important to use the Limiter carefully.
- Lookahead: This control allows the Limiter to start reducing the signal before the peak occurs. This can make it considerably less obtrusive; it corresponds to the Attack & Release settings of the Compressor proper.
观众反应
原帖 由 antress 于 09-11-19 15:06 发表
这样说也许比较清楚。
假如你设定Reverb 的Pre-Delay 为500ms，那么Wet 的声音会在Dry 出现了500ms 后才跟着出现，不会跟Dry 同时出现。
Compressor 的 Lookahead 也是一样意思的。
假如你设定Compress ...
今天找了个时间仔细的想想看看,如果HIMHUI老师提供的资料里的Softube FET Comp 的Lookahead是通样的话，与algorithmix LP comp也通样的话？
1.The output signal will be delayed by up to 1 millisecond.
2.The detector will “see” the undelayed signal, but reduce the gain on the delayed signal. This means that the detector will be able to compress the signal before the actual transient comes (since the actual transient has been delayed).
我对含（启动）lookahead功能的comp/limiter效果器mix出听到的output声理解之简结是：
comp/limiter效果器的output声（不含lookahead声／时长）被延迟output并与延迟期间那部分时长的来源声mix出整个含（启动）lookahead功能的comp/limiter效果器的最终output声，其中lookahead数是延迟的时长数．（没想到简结一说就这么长
）不知道我的理解对不对呢？（好象不对又好象对
）如果不对，请各位老师来指正！谢谢！[ 本帖最后由 希布 于 09-11-26 06:26 编辑 ]