Phase Cancellation: Difference between revisions
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Phase (cancellation, interference) | Phase (cancellation, interference) | ||
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Running two inputs 180° out-of-phase puts the peaks and valleys of the sine wave so that they null each other out when summed (see the middle picture below). This has a tendency to cancel out both inputs, and is quite pronounced in the "far" field, but negligible in the "near" field. Normally phase cancellation is undesirable, but when you know what you want (and in this case, what you don't want) then you do it deliberately. | Running two inputs 180° out-of-phase puts the peaks and valleys of the sine wave so that they null each other out when summed (see the middle picture below). This has a tendency to cancel out both inputs, and is quite pronounced in the "far" field, but negligible in the "near" field. Normally phase cancellation is undesirable, but when you know what you want (and in this case, what you don't want) then you do it deliberately. | ||
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[http://www.sfu.ca/sca/Manuals/ZAAPf/p/phase.html Phase at SFU]] | [http://www.sfu.ca/sca/Manuals/ZAAPf/p/phase.html Phase at SFU]] | ||
Phase cancellation occurs when two signals of the same frequency are out of phase with each other resulting in either a boost or cut in the overall level of the combined signal. | Phase cancellation occurs when two signals of the same frequency are out of phase with each other resulting in either a boost or cut in the overall level of the combined signal. | ||
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See: [http://www.livesoundint.com/archives/2003/july/phase/phase.php Practical Realities of Phase Interference] | See: [http://www.livesoundint.com/archives/2003/july/phase/phase.php Practical Realities of Phase Interference] | ||
See: [[:Category:Phase|Phase]] | |||