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- The time relationship between two signals.
- The relation of one audio
waveform to another, particularly in sound waves. "In phase" means that the
voltages of two signals with the same waveform are rising or dropping at the
same time at the same rate all of the time. If they are not in phase, when the
signals combine (either in a mixing console or as sound coming out of two
different speakers arriving at the same location) it will cause a doubling or
canceling of various frequencies of the signal. In balanced microphone
wiring, the (+) wire is 180-degrees out of phase of the(-) wire to help
eliminate noise picked up by the wire. In speakers, if two speakers are wired
out of phase, one speaker will be pushing out to make a sound while the other
will be pulling in to make the sound and hence be fighting each other.
Source: Church Audio & Acoustics Glossary
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Phase is the
measure of progression of a periodic wave. Phase identifies the position at any
instant which a periodic wave occupies in its cycle. It can also be described as
the time relationship between two signals.
Source:
http://www.owenscorning.com/around/sound/glossary.asp
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