Phase cancellation refers to the effect of two waves that are out of phase with each other being summed. Since the waves are not in phase, the crest and trough will not match up, and the end result could be a wave that has less overall amplitude than both of the original waves. Amplitude is a nonnegative scalar measure of a waves magnitude of oscillation, that is, magnitude of the maximum disturbance in the medium during one wave cycle. ...
Examples
Many times, in sound reinforcement systems and recording studios, phase cancellation will occur. If a single acoustical source is picked up by two different microphones, the difference in distance from the source and the microphone will cause the phase to be different. When the two signals are combined, some phase cancellation occurs, and the quality and tonality of the sound is effected. A recording studio is a facility for sound recording. ... A microphone with a cord A microphone, sometimes called a mic (pronounced mike), is a device that converts sound into an electrical signal. ...
Phase describes where in its cycle a periodic waveform is at any given time.
Phasecancellation occurs when two signals of the same frequency are out of phase with each other resulting in a net reduction in the overall level of the combined signal.
Phase and phase difference is a real-world issue in areas such as electrical wiring of audio equipment, signal path, and microphone placement during the recording process.
The method of phasecancellation is to use two separate antennas to enable the removal of an unwanted signal, while allowing reception of a DX signal at the same frequency.
Phasecancellation nulls will be greater when there are minimal metallic objects in the vicinity of the DX and reference antennas.
Due to the remote possibility that both antennas are in phase with respect to antenna spacing, it may be worthwhile adding approximately 5-30 inches of coax to the interference line.
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