A particular appearance or state in a regularly recurring cycle of changes with respect to quantity of illumination or form of enlightened disk; as, the phases of the moon or planets. See Illust. under Moon.
Any one point or portion in a recurring series of changes, as in the changes of motion of one of the particles constituting a wave or vibration; one portion of a series of such changes, in distinction from a contrasted portion, as the portion on one side of a position of equilibrium, in contrast with that on the opposite side.
The relation at any instant of a periodically varying electric magnitude, as electro-motive force, a current, etc., to its initial value as expressed in factorial parts of the complete cycle. It is usually expressed in angular measure, the cycle beb four right angles, or 360°. Such periodic variations are generally well represented by sine curves; and phase relations are shown by the relative positions of the crests and hollows of such curves. Magnitudes which have the same phase are said to be in phase.
the relation at any instant of any cyclically varying physical quantity, such as voltage in an A.C. circuit, an electromagnetic wave, a sound wave, or a rotating object, to its initial value as expressed as a fractional part of the complete cycle. It is usually expressed in angular measure, the complete cycle being 360°.
The relationship between the current and voltage in an AC circuit, with respect to their angular displacement.
Refers to the timing relationship of two or more signals or sound-waves. In phase means that the speakers are moving in and out at the same time. If your speakers are out of phase you'll hear significantly less bass, and the sounds will localize to the individual speakers.
the physical state of an object, for example, solid, liquid, or gas. Also, a property of waves indicating the displacement at the initial time.
time span between a peak and a trough.
The time-domain relationship between two or more signals. Phase issues arise when identical audio signals from two different sources arive at the same point at slightly diffent times. Some frequencies may be cancelled out or attenuated, while others are boosted.
The angular distance from the Sun, to a body being observed, to the observer, measured in degrees. Describes the particular appearance of a body's state of illumination, such as the "full," "gibbous," "half," and "crescent" phases of the Moon.
That part of a signal cycle during which one or more movements receive right of way subject to resolution of any vehicle or pedestrian conflicts by priority rules. A phase is identified by at least one movement gaining right of way at the start of it and at least one movement losing right of way at the end of it.
A particular state or point of advancement in an electrical cycle. The fractional part of the period through which the time has advanced measured from some arbitrary point usually expressed in electrical degrees where 360° represents one cycle.
The angular relationship between two alternating currents or voltages when the voltage or current is plotted as a function of time. When the two are in phase, the angle is zero; both reach their peak simultaneously. When out of phase, one will lead or lag the other; that is, at the instant when one is at its peak, the other will not be at peak value and (depending on the phase angle) may differ in polarity as well as magnitude.
The degree of progression in the cycle of a wave, where one... ( more)
A difference in starting point for signals or events with the same period. Events can be in phase or out of phase with each other.
A major period in the life of a project culminating in a major milestone. A Phase may encompass several Stage [D01186] CCCP A defined segment of work. [D01185] 08 -3 logic al group of related task s that complete s a major step in a project. [D01187] MSP98 See Project Phase. [D01188] The time between two major project milestone s, during which a well-defined set of objectives is met, artifact s are complete d, and decision s are made to move or not move into the next phase. [D04744] RUP part of the program life cycle, into which activities to manage the program are group ed. The four phases of a program are Program Identification, Program Definition, Program Execution and Benefits Realization. All four phases may be repeated for each tranche of a program if necessary. [D05036] KSI
in phase; out of phase; wave phase. A phase is a part of a sample of matter that is in contact with other parts but is separate from them. Properties within a phase are homogeneous (uniform). For example, oil and vinegar salad dressing contains two phases: an oil-rich liquid, and a vinegar-rich liquid. Shaking the bottle breaks the phases up into tiny droplets, but there are still two distinct phases. In wave motion, phase is the fraction of a complete cycle that has passed a fixed point since the current cycle began. The phase is often expressed as an angle, since a full cycle is 360^deg; (2 ). Two waves are "in phase" if the peaks of one wave align with the peaks of the other; they are "out of phase" if the peaks of one wave align with the troughs of the other.
A relative quantity describing the time relationship between or among waves having identical frequency. The complete wave cycle is divided into 360 equal parts, called degrees of phase
one of the apparent forms of the Moon. The Moon cycles through 8 phases.
Position of a periodic waveform.
the repeating portions of a cyclic phenomena, such as the varying shape of the sunlit portion of the Moon during its monthly orbit or the relationship between the crests and trough of a wave.
Two oscillators that have the same frequency and amplitude, but reach their maximum displacements at different times, are said to have different phases. Similarly, two waves are in phase if their crests and troughs line up exactly, and they are out of phase if the crests of one wave line up with the troughs of the other.
a particular reference point in the cycle of a rhythm, e.g. the daily onset of locomotor activity, or the light-to-dark transition in a zeitgeber cycle – see above.
Electrical term refering to the timing difference between two or more signals. Can be productive when used to create a stereo effect, or destructive when two out of phase records of the same "voice" do not line up.
One of several (usually three) windings that comprise the armature. Three phase windings have their generated voltages 120 degrees apart. Each winding represents a Phase A, Phase B and Phase C.
The means for comparing time reference points on two waveforms, or time from a reference in one waveform. The unit of phase is degrees or radians.
Different â€œstageâ€ or â€œformâ€ which a boss takes during the course of a battle, usually changing its appearance and/or attacks. A change of phase is usually prompted by the degree of damage done to the boss, but sometimes it depends simply on how long the battle has lasted.
This is a particular point in the time of a cycle that is measured from some arbitrary zero and expressed as an angle.
The "time" relationship between cycles of differ-ent waves. Pickup Angle/Coverage Angle - The effective arc of coverage of a microphone, usually taken to be within the 3dB down points in its directional response.
An angular relationship between waves.
Phase is the time interval between two related events. Two signals are in phase when they reproduce the same sound or signal simultaneously; they are out of phase to the extent that one leads or lags behind the other in time. A signal is said to be in phase with another when the voltage and current amplitudes begin at the same time and move in the same direction.
Voltage carrying conductor.
Location of a position on an alternating wave form.
It is the angular measure of the difference in the starting point of two sine-waves.
a mid-sized stage that is an identified part of a cycle, consisting of a cohesive set of one or more builds and milestones. See also business strategy phase, business optimization phase, initiation phase, construction phase, delivery phase, usage phase, and retirement phase.
Various portions of the breathing cycle defined by the direction and sequence of flow; e.g., in the inspiratory phase, flow is either into the lungs or has stopped after the lungs have expanded; during the expiratory phase, flow is either out of the lungs or has stopped after the lungs have deflated.
The timing of AC current cycles in different wires. 3-phase alternators produce current that is cyclically timed between 3 different wires and a common wire, while single phase produces it in only 1 wire and a common. In a 3-phase alternator, wire #1 receives a voltage peak, then wire #2 receives a peak, then wire #3, and so on. A diagram is an easier way to explain phase, check out Windstuffnow.com's 3-Phase and 1-Phase Basics page for detailed diagrams.
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 cencelling 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.
The position of a wave in its oscillation cycle.
The relative timing of one signal to another, usually expressed in degrees of shift.
(1) Any recurring aspect of a periodic phenomenon, such as new Moon, high water, flood strength, etc. (2) A particular instant of a periodic function expressed in angular measure and reckoned from the time of its maximum value, the entire period of the function being taken as 360°. The maximum and minimum of a harmonic constituent have phase values of 0° and 180°, respectively.
The relationship of an audio signal or sound wave to a specific time reference.
Hmmm. Tricky..... Ah-ha! Think of a bunch of soldiers all marching happily (?) to the sergeant's cries of "Hep, rah, hep-rah-hep" - except for Pt. Johnny who is blissfully "Rah, hep, rah-hep-rah"-ing. He is 180 degrees out-of-phase with the rest (or vice-versa). So it is with musical signals, where some signals have a "phase angle" (phase is measured in degrees of rotation) which is different from other signals
The timing of a cycle or wave as regards peaks and troughs in comparison to other cycles or waves of the same period. To be in phase is to have the same timing of peaks whereas to be out of phase has different timing.
describes one or more signals that neither lag nor lead one another; step motors typically have two phases and brushless motors typically have three phases.
an angular relationship describing the degree of synchronism between two sinusoidal waveforms of the same frequency.
The phase of a periodic waveform is the fractional part of a period through which the waveform has advanced, measured from some arbitrary point in time
Waves are in phase with each other when all the troughs and peaks coincide and are "locked" together. The result is a reinforced wave in increased amplitude (brightness).
When something is in phase with another wave, it is said to be moving in the same direction and same wavelength, frequency, pitch etc. with the other wave.
The onset of a displacement on a seismogram indicating the arrival of the different types of seismic wave.
For a wave, the position in its cycle at a specified time: a measure of whether it is at a crest, a trough, or somewhere in between.
Two waves are in phase if their crests and troughs line up exactly, and they are out of phase when the troughs and crests do not align. If the crests of one wave line up exactly with the troughs of the other, the waves are said to be completely out of phase.
A measure of how well two waves are aligned. "In phase" means the crests align perfectly and add together; "1800 out of phase" means crests align with valleys and the waves cancel each other. It is easier to show graphically (18.8 kb) than to describe. A system has a flat (i.e. good) phase response if the relative phase of the input and output signals is the same for all frequencies (actually a linear variation is equally good). This is particularly important for good transient response.
Water can be in three different forms, or phases: liquid, solid, and gas. The gas phase of water is vapor. We measure the amount of water vapor in the air in terms of the humidity. The solid phase of water is ice; water turns into ice when it gets cold (below 0 degrees Celsius). The liquid phase is the kind of water that comes out of a sink; water is a liquid when it is between 0 and 100 degrees Celsius. Vapor, ice, and liquid water are really all still water. The only difference is their phase. Ice Water Vapor
1. For a wave, the position of any particular feature of the wave. 2. For matter, a distinct form of a substance, such as solid, liquid, or vapor.
The timing of an AC electric current. Some 60 Hz current is a three-phase system, with each of the three phases reaching its peak at a different point in the cycle. The three work together in transmission lines and circuit wiring.
Phase measures the uniform periodic change in amplitude or magnitude of an alternating current.
Phase is electrical degrees of displacement between two encoder outputs, typically 90° in quadrature encoders.
Measured in degrees up to 360, as in a circle, phase refers to points in a sine wave cycle. The crossover point between positive half of the cycle and negative half cycle is 180 degrees. If the left channel is shifted by 180 degrees relative to the right channel, and identical information is fed to both channels, assuming the two loudspeakers are perfect and turned to face each other, the signal will be self-canceling. No sound should be audible. If a system is connected out of phase, music signals fed through a normally positioned pair of loudspeakers will sound unfocused with a monotonous undifferentiated bass. It is easy to accidentally connect a system out of phase by wiring the positive lead of one channel to the negative socket. If both channels are accidentally connected this way, the system will be in-phase, but strictly speaking in reverse phase. Some amplifiers feed a reverse phase signal to the loudspeakers. Users should check the manufacturer's owners' manual for optimum mode of connection. Some products are fitted with a phase inverter switch to enable direct comparison.
The angular measure of the difference in that starting point of two sine waves or periodic signals. Measured in degrees or radians.
the measure of the position along the sinusoidal vibration. One complete cycle contains 360 degrees, and a phase angle of 0 degrees is said to occur when the vibration beginning at equilibrium moves toward positive displacement. Similarly, a phase angle of 90 degrees occurs when the vibration beginning at the maximum positive displacement moves toward equilibrium. The phase angle between two sinusoid waves reflects the difference in phase between the two waves.(H:554)
In a periodic function, the fraction of a period that has elapsed since some arbitrary reference point.
The instantaneous angular position which a sine wave occupies in its cycle. The position is usually measured in degrees as referenced to zero and referred to as phase angle.
Angular distance between peaks or troughs of two wave forms of similar frequency.
(of a wave) The position of any particle of the medium in its cycle.
A level of the system life cycle that generally specifies major activities, products, reviews and organizations, roles and responsibilities; and that establishes the level of detail and establishes product accountability.
One of the 5 major breakdowns of the cycle (plan, design, build, deploy, support).
A description for the relative position in a cyclical or wave motion. Because one complete wavelength is described as 2 radians or 360 degrees, the phase of a wave is given in radians, degrees, or fractions of a wavelength. The term in phase refers to phase angles between two wavefront occurrences of zero and 360 degrees or a whole number multiple of these.
Time relationship between signals; it's all relative.
a particular period in the process of a cycle
Time relationship between signals, expressed trigonometrically. It relates the time to the wavelength, one cycle being equated to 360°.
One distinct part of a cycle.
Phase refers to the windings of an AC generator. In a three-phase generator there are three windings, typically designated as A-B-C, R-S-T or U-V-W. The phases are 120 degrees out of phase with each other. That is, the instants at which the three phase voltages pass through zero or reach their maximums are 120 degrees apart, where one complete cycle is considered 360 degrees. A single-phase generator has only one winding.
Two meanings: (1) The particular appearance of a body's state of illumination, such as the full phase of the moon. (2) As applied to electromagnetic waves, phase is the relative measurement of the alignment of two waveforms of similar frequency.
The timing of a sound or electrical wave that is measured in degrees from 0 to 360.
A measurement of the timing relationship between two signals, or between a specific vibration event and a keyphasor pulse. Phase is often measured as a function of frequency.
refers to the timing of the peaks or troughs. For example we might say that the phase of the 1 year temperature cycle has a maximum in January (I live in the southern hemisphere).
that part of a project during which a set of related and interlinked activities are performed. Note: a project consists of a series of phases that together constitute the whole project life cycle.
in a periodic function (such as rotational or sinusoidal motion), the position relative to a particular part of the cycle.
Indicates the space relationships of windings and changing values of the recurring cycles of A.C. voltages and currents. Due to the positioning (or the phase relationship) of the windings, the various voltages and currents will not be similar in all aspects at any given instant. Each winding will lead or lag another, in position. Each voltage will lead or lag another voltage, in time. Each current will lead or lag another current, in time. The most common power supplies are either single (10) or three phase (with 120 electrical degrees between the 3 phases).
Represents the number of voltage and/or sine waves generated per 360 electrical degrees. Every phase requires a complete set of windings.
("In-phase/Out-of-phase") Actually refers to the polarity of an electrical or acoustic signal. If two or more signals or devices are "out-of-phase" with respect to each other, cancellation or other disturbance of the combined output can result. Some examples of operating phase (polarity) definitions: "Positive sound pressure causes positive output" (microphones) or "positive input causes positive acoustic output" (speakers).
a factional part of the period of a sinusoidal wave, usually expressed in electrical degrees.
the regular cycle of changes in the appearance of a moon or planet
In audio, phase refers to the timing relationship of two or more waves. It's especially important to be sure that your speakers are wired "in phase." This means that the drivers of your speakers are moving in and out at the same time. If your speakers are "out of phase" there will be significantly less bass, and a loss of stereo imaging.
Phase is the frequency coherence of a signal. If two signals are out of phase, the trough of the first waveform corresponds with the peak of the second, resulting in cancellation. Many mixers can invert the phase of the input signals, which allows you to compensate for incorrectly wired conductors and out of phase devices.
Relative position in a cyclical or wave motion. Phase is expressed as an angle, one cycle or one wavelength corresponding to 180 degrees.
A time based relationship between a periodic function and a reference. In electricity, it is expressed in angular degrees to describe the voltage or current relationship of two alternating waveforms.
Refers to the timing relationship of two or more signals or soundwaves. It's especially important to be sure that your stereo speakers are playing "in phase." This means that the drivers (cones and domes) of your right and left speakers are moving in and out at the same time. If your speakers are out of phase you'll hear significantly less bass, and instead of producing a strong center image, the sound tends to stay localized at the speakers.
time arrival of the information. Out of phase means wave is 180 degrees shifted from the in phase (ideal) wave.
A distinct division within a process model or product life cycle, typically culminating in a major or external milestone, or representing a fundamental transition in the development of a product or service. In Microsoft Solutions Framework, process models and the product life cycle comprise four phases. Phase in MSF correlates with "quadrant" in MOF. Phase as used in MSF infers that activities or tasks within each phase occur sequentially, with distinct demarcations between phases, although some overlap may occur. Quadrant is used in MOF to distinguish the fact that tasks or activities from each quadrant may begin nearly simultaneously and may continue concurrently for the life of the project.
The position of a wave in space, measured at a particular point in time.
The amplitude of a cyclic signal at a specific point in time.
A means of distinction between single phase, a single AC alternating sine wave; or three phase, three AC alternating sine-waves, 120 degrees out of phase with each other.
The relative angular displacement of one sinusoidal quantity with respect to a reference angle or to another sinusoidal varying quantity of the same frequency. The relative angular displacement of one sinusoidal quantity with respect to a reference angle or to another sinusoidally varying quantity of the same frequency.
A defined stage in the systems development life cycle; there are nine phases in the full, sequential life cycle.
the relative measurement of a period of time referenced to the start point of a cycle of a periodic waveform. In one complete period, a wave's polarity fluctuates 360 degrees (180 degrees positive and 180 degrees negative). Absolute phase is a reference point in time within one cycle; e.g., halfway through one period, the waveform's phase is 180 degrees. At one-quarter of the waveform, the phase is 90 degrees. Relative phase is an instantaneous ("snapshot") measure of the difference in time between two acoustic or electronic waveforms of the same waveform and frequency. For example, if one waveform is one-quarter of the way through its cycle (90 degrees at its peak positive value) and the other is three-quarters of the way through its cycle (270 degrees at its greatest negative value), they are 180 degrees out-of -phase with respect to each other. The two signals are "in phase" if their amplitudes are identical at the same point in their cycles. Console inputs often have "phase" switches (more correctly, these should be referred to as "polarity" switches), which invert the phase of the signal 180 degrees.
In a periodic wave, the fraction of a period that has elapsed. Describes the time relationship between two signals.
the relative position of a wave to some reference point.
a measure of the temporal relationship between two signals. Reflects the speed of information sharing between two sites, or between two sites and a third (or more) sites. Two sinewave signals are said to be "in phase" (have zero phase difference) when their peaks and valleys are aligned in time. Phase is generally measured in degrees, ranging from 0 degrees (in phase) to 180 degrees (out of phase).
The uniform periodic change in amplitude or magnitude of an alternating current. Three phase alternating current consists of three different sine wave current consists of three different sine wave current flows, different in phase by 120 degrees from each other.
Phase is the measure of the angular relationship, measured in degrees between two events. In the context of balancing it is the relationship between the sine wave generated of the out-of-balance forces compared with a one-per-revolution time reference signal.
The time-based relationship between alternating current cycles and a fixed reference point. In electricity, it is usually expressed in angular degrees, with a complete cycle equal to 360°. It describes the relationships of voltage and current of two or more alternating waveforms.
That portion of a period or cycle through which a quantity (in this case a wave of electromagnetic radiation) has proceeded from an arbitrary point, for example the crest or highest point in amplitude of its wavelength, to the next crest after passing through zero.
The timing difference between two electrical waveforms expressed in degrees where 360 degrees corresponds to a delay of exactly one cycle.
The onset of a displacement or oscillation on a seismogram indicating the arrival of a different type of seismic wave.
The order of arrival of a signal or pressure wave. When multiple signals or waves arrive in synchronisation, they are said to be in phase. If there is any variance in the sequence of arrival, they are out of phase to some extent.
1. For any type of periodic motion (e.g., rotation, oscillation) a point or stage in the period to which the motion has advanced with respect to a given initial point. Specifically, the phase or phase angle is the angular measure along a simple harmonic wave, the linear distance of one wavelength being 360° of phase measure. This is often generalized by equating one cycle of any oscillation to 360°. See delay, interference, surface of constant phase. 2. The state of aggregation of a substance, for example, solid, liquid, or gas.
The shift of a periodic signal, often measured referenced to its zero crossing, compared to a reference signal of the same frequency. One period of the signal is defined as having a duration of 360 degree of 2 pi radians.
The angle of a wave form at a given moment.
The amount of time that passes from the beginning of a cycle to the beginning of the next cycle, measured in degrees.
relates the value of a quantity to a broader set of likewise quantities. There is no sound conceptual connection--although historical bonds are patent--with other use of the term in such context as phases of matter, phases of the Moon or one of several immiscible liquids. For a wave it thus relates the position of a feature, typically a peak or a trough of the waveform, to that same feature in another part of the waveform (or, which amounts to the same, on a second waveform). The phase may be measured as a time, distance, a fraction of the wavelength, or as an angle in radians.
The relative displacement of a time-varying waveform in terms of its occurrence with respect to a reference.
Angular relationship between two waves.
Alternating current is carried by conductors and a ground to residential, commercial, or industrial consumers. The waveform of the phase power appears as a single continuous sine wave at the system frequency whose amplitude is the rated voltage of the power.
The angular relationship between waves.
The relative position of two sound waves with respect to each other.
Any of the stages of variation in appearance or illumination of a planet; used most commonly to describe the various stages in the Moon's cycle. See also lunation cycle, waning phase, waxing phase.
1. Any of the stages or forms in a series or cycle of changes, as in development. 2. The fractional part of a cycle through which a periodic wave has advanced at any instant, measured from an arbitrary starting point, such as with sound or light, etc. 3. To introduce gradually.
The number of individual voltages applied to an AC motor. A single-phase motor has one voltage in the shape of a sine wave applied to it. A three-phase motor has three individual voltages applied to it. The three phases are at 120 degrees with respect to each other so that peaks of voltage occur at even time intervals to balance the power received and delivered by the motor throughout its 360 degrees of rotation.
A measure of the relative position of a signal relative to a reference expressed in degrees.
In AC power systems, load current is drawn from a voltage source which typically takes the form of a sine wave. Ideally, the current drawn by the loads in the system is also a sine wave. With a simple, resistive load such as a light bulb, the current sine wave is always aligned with the voltage sine wave. This is called single-phase. A single-phase power system normally uses three wires, called hot, neutral, and ground, and the voltage is typically 120/240. Most home and office outlets operate in this manner. With some loads, such as motors, and in high voltage systems, the current sine wave is purposely delayed and lags behind the voltage sine wave. The amount of this lag is expressed in degrees and is called a phase difference. A common example is three-phase power, where the system has three "hot" wires, each 120 degrees out of phase with each other.