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Out Of Phase Stereo
Out Of Phase Stereo (OOPS) is an audio technique which manipulates the phase of a stereo audio track, to isolate or remove certain components of the stereo mix. It works on the principle of phase cancellation, in which two identical but inverted waveforms summed together will "cancel the other out".
==Phase-cancelling technique==
In practice, the OOPS technique can be performed by inverting the polarity of one speaker or signal lead. It can also be performed using digital audio software by inverting one of the channels of a stereo audio waveform, and then summing both channels together to create a single mono channel. Those components common to both channels (that is, those sounds that are recorded as a mono track, and duplicated identically onto both channels) will be phase cancelled, leaving only those sounds that differ between channels.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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