Search results
Results From The WOW.Com Content Network
A phaser is an electronic sound processor used to filter a signal by creating a series of peaks and troughs in the frequency spectrum. The position of the peaks and troughs of the waveform being affected is typically modulated by an internal low-frequency oscillator so that they vary over time, creating a sweeping effect.
The phase difference is particularly important when two signals are added together by a physical process, such as two periodic sound waves emitted by two sources and recorded together by a microphone. This is usually the case in linear systems, when the superposition principle holds.
In signal processing, phase noise is the frequency-domain representation of random fluctuations in the phase of a waveform, corresponding to time-domain deviations from perfect periodicity . Generally speaking, radio-frequency engineers speak of the phase noise of an oscillator , whereas digital-system engineers work with the jitter of a clock.
S φ is the spectral density of the phase and S v is the spectral density of the voltage. S v contains both amplitude and phase components, but with oscillators the phase noise dominates except at frequencies far from the carrier and its harmonics.
The phase velocity of a wave is the rate at which the wave propagates in any medium. This is the velocity at which the phase of any one frequency component of the wave travels. For such a component, any given phase of the wave (for example, the crest) will appear to travel at the phase velocity.
Ohm's acoustic law, sometimes called the acoustic phase law or simply Ohm's law, states that a musical sound is perceived by the ear as a set of a number of constituent pure harmonic tones. [1] [2] The law was proposed by physicist Georg Ohm in 1843. [3]
The concept of absolute phase is rendered irrelevant for any instrument with strings (such as a guitar or piano), or for two or more instruments played together. Complex sounds such as these are known to have an undetectable phase relationship. [1] In practice, the absolute phase of an audio system can be assumed to be inaudible. [6]
Phase music is a form of music that uses phasing as a primary compositional process. It is an approach to musical composition that is often associated with minimal music , as it shares similar characteristics, but some commentators prefer to treat phase music as a separate category. [ 1 ]