A few months i posted a video that was explaining the basic principle of phase cancelation but apparently it has been removed from youtube. This video explains the same, more or less.. Phase cancellation does not only occur on stage with physical mics, but it happens all the time, in any production and in any DAW. It is inevitable. For example if youre layering sub bass for whatever reason that might be you could have the impression that an LFO is modulating the amplitude in low amounts, but in fact you are just canceling out certain frequenties because the 2 or more bass lines are out of phase. When you take a look at phase cancellation on stage you will understand that that is identical to what actually happens inside your DAW. Why is phase cancellation happening? imagine that 2 vocalist are performing and each have their own microphone. When the vocalists are standing next to each other which will probably be the case, the mics will intercept the voice of the vocalists and send the signal to the mixer, and from thereon to the speakers. Now, depending on how far the 2 mics are separated from each other they will also intercept the voice from the other vocalist and visa versa. Its quite obvious that the signal received by the microphone of the performer next to you will reach the speakers fairly later then the signal of your own microphone which for that matter is out of phase. Of cours there are a few rules you need to keep in mind in order to avoid this including the distance between the microphones, instruments, vocalists and other sound sources is most important ! Also when you accidentally catch the sound of your (monitor)speakers with a few of the microphones on stage, this can not only lead to feedback but is also a very common type of phase cancellation that occurs in basically every situation. Always use noise-gates on your microphones and please consider monitor/speaker/microphone placement. As i mentioned above with electronic music inside your DAW it works exactly the same only the sound source will be different, in this case you will not use mics but samples or synthesizers instead to create sounds. The principle is the same. Sound is represented as waveforms vibrating on different frequencies. Phase cancellation and harmonics have a lot in common, if you for example layer 2 saw-waves and you detune one of them them, a lot of phase cancellation is happening at this point, especially in the higher frequencies. Im sure you have noticed very drastic or typical forms of phase cancellation without recognizing it, so in fact that means that phase cancellation is not always has to be seen as a bad thing because it can also be used as a technique, at least in my point of view.
Posted on: Thu, 04 Sep 2014 12:48:06 +0000
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