限幅压缩滤波这三者在原理和使用上有什么区别
RT！谢谢啦！ 限幅是限制波的高度~压缩是压缩声音均衡上的宽度，让音变的更紧凑。
滤波不懂了。。。 滤波是个很神奇的东西，从英文上叫Envelope Filter就波形过滤，但是具体怎么回事我也在研究，很像小小哇，坐等高手吧~ 滤波有点类似自动哇音 据说可以做比哇音更夸张的效果 坐等高手~~ 滤波就是把Q值调大的是扫频. 呃,怎麼說呢,同樣是饅頭,一口吃不下的話可以用刀切平了,這就是限幅;也可以用手捏緊,這就是壓縮.
濾波的原理還要考證下... 滤波使声音产生物理状漩涡 使声音更具空间感 个人见解
check this out
From Wikipedia, the free encyclopediaJump to: navigation, search
Auto-wah (also known as an "envelope following filter" or just "envelope filter") is a type of wah-wah effects pedal typically used with electric guitar, bass guitar, clavinet, and electric piano etc. When used, it creates an audio effect similar to that of the sitar employing a resonator.
The distinctive choppy rhythm guitar sound on many funk and disco recordings from the 1970s popularized the effect.
Instead of the effect being controlled by a foot pedal, as on a standard wah-wah, the effect alters in response to the volume of the input signal . Since the electronic circuits in the effect can respond much faster than a human musician can physically move a foot pedal, certain effects that a standard wah cannot achieve are only possible with auto-wah. The response of the effect is highly interactive with the dynamics of the input signal - this makes it possible to vary the response at will via slight adjustments to playing technique. Therefore it may take some practice before the response of the auto-wah can be wilfully controlled in order to achieve a consistent sound.
A typical auto-wah circuit uses an envelope follower to produce a voltage representing the overall volume of the input. This signal is then used to sweep the cutoff frequency of a filter. The filter usually has a low pass or bandpass response. The Boss AW-3 is an example of such a device.
There is a variant of auto-wah that utilises a low frequency oscillator (LFO) instead of an envelope follower to alter the effect. The filter response varies constantly with time and is not linked to playing dynamics. The Boss AW-2 is an example of such a device. The difference in sound is subtle, but careful listeners will notice the constant period of the filter sweep. The song "Falling Into Grace" by The Red Hot Chili Peppers is a good example of an LFO controlled auto-wah applied to the bass guitar.
Typical controls on an auto-wah include a sensitivity control to adjust the input level to match the level expected by the envelope follower and other circuitry, a control for the initial cutoff point of the filter, and a control for the depth of the filter sweep. Some more sophisticated units offer controls for the resonance of the filter, multiple filter types, and options for sweeping the filter up or down.
Commercial examples include the MXR Envelope Filter, the Musitronics Mutron III and the Boss AW-2 Auto Wah (LFO controlled).
This effect is exemplified by the songs "Going Mobile" by The Who; "Industrial Disease" by Dire Straits; "What I Am" by Edie Brickell & New Bohemians;"I Disappear" by Metallica, and "Estimated Prophet" by The Grateful Dead. It is commonly used with a bass guitar and many fine examples can be found by listening to recordings by Bootsy Collins. Probably the best known bass guitar line with envelope follower controlled auto-wah applied is "Sir Psycho Sexy" - Red Hot Chili Peppers.
Another notable example is Higher Ground by Stevie Wonder, where the main effect was created by playing a Clavinet through an auto-wah.
envelope filter
可看看以下加了envelope filter 的音效:-http://www.youtube.com/watch?v=RCo_jOB3tCw 压缩内部应该是把过小和过大的信号增强和减小 滤波就是一种能发出奇怪声音的效果器，与前两者有本质区别 原帖由 youngkyd 于 2010-4-6 18:18 发表 http://bbs.guitarschina.com/images/common/back.gif
限幅是限制波的高度~
压缩是压缩声音均衡上的宽度，让音变的更紧凑。
滤波不懂了。。。
压缩可以提升小音量~限制大音量~让波形稳定,动态变化幅度变小..具象点说好象是啤酒瓶里的啤酒倒出来时候经过瓶颈的感觉.和均衡没有关系.至于让声音更紧凑~实际上是在听觉上强化了音头~增强了延音,音头音量衰弱的更慢些所得到的效果!
限幅就如同名字一样是限制振幅.好象人过矮屋檐的感觉!超过某一特定量的振幅被限制在这个量中!
滤波器实际上是过滤特定的频率!任何声音都是有一个基音和无数泛音组成~~可以看作是一个正弦波和无数个谐波组成.滤波器可以有选择性的过滤这些谐波~~从而得到我们需要的声音~~比如我在混音制作中常常听到的低通\高通\带通这些说法~就是用滤波器实现某个高或者低的频率成分通过而得到的改变的声音信号~以上的解释是我的认识~请高手指正! 刚上课看了下书 限幅是把过大的信号去掉 电路使用二极管 滤波是把某频率的波去除掉 电路是由运放和电阻电容组成的 谢谢大家啊 慢慢清楚一些了
还想请问一下压缩和均衡在实际运用中是如何选择的呢？？ 原帖由 freeze! 于 2010-4-7 22:11 发表 http://bbs.guitarschina.com/images/common/back.gif
谢谢大家啊 慢慢清楚一些了
还想请问一下压缩和均衡在实际运用中是如何选择的呢？？
看风格~靠耳朵~~这个没办法一句话说 领略孔雀兄高见。。。
页:
[1]