This article is about the audio effect. For other uses, see Phase.
Image of a phaser guitar stompbox. A phaser is an audio signal processing technique used to filter a signal by creating a series of notches and/or peaks in the frequency spectrum. The position of the notches/peaks typically modulated, so they vary over time, creating a sweeping effect. For this purpose, phasers usually include a low frequency oscillator. Image File history File links Broom_icon. ...
Look up Phase in Wiktionary, the free dictionary Phase may refer to: Phase (matter), a physically distinctive form of a substance, such as the solid, liquid, and gaseous states of ordinary matter Phase (waves), the time position (or angle in the complex plane) within a cycle of a periodic waveform...
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This article or section does not cite its references or sources. ...
An audio filter is a type of filter used for processing sound signals. ...
In telecommunications, modulation is the process of varying a periodic waveform, i. ...
Low frequency oscillation, often abbreviated to LFO, is a term that predominantly refers to an audio technique specifically used in the production of electronic music. ...
Process
Spectrogram of a 8-stage phaser modulated by a sine LFO applied to white noise. The electronic phasing effect is created by splitting an audio signal into two paths. One path treats the signal with an all-pass filter, which preserves the amplitude of the original signal and alters the phase. The amount of change in phase depends on the frequency. When signals from the two path are mixed, the frequencies that are out of phase will cancel each other out, creating the phaser's characteristic notches. Changing the mix ratio changes the depth of the notches; the deepest notches occur when the mix ratio is 50%. Image File history File links No higher resolution available. ...
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An all-pass filter is an electronic filter that passes all frequencies equally, but changes the phase relationship between various frequencies. ...
The definition of phaser typically excludes such devices where the all-pass section is a delay line, such a device is called a flanger [1]. Using a delay line creates an unlimited series of equally spaced notches and peaks. It is possible to cascade a delay line with another type of all-pass filter as in [2], this combines the unlimited number of notches from the flanger with the uneven spacing of the phaser. The term delay line has multiple meanings: In electronics and derivative fields such as telecommunications, a delay line is rigorously defined as a single-input-channel device, in which the output channel state at a given instant, t, is the same as the input channel state at the instant t...
A flanger could be: Railroad maintenance of way equipment designed to clear snow from the flangeways of railroad tracks – see Flanger (railroad) Audio processing equipment that combines two audio streams of opposite phase – see Flanging This is a disambiguation page — a navigational aid which lists other pages...
The term delay line has multiple meanings: In electronics and derivative fields such as telecommunications, a delay line is rigorously defined as a single-input-channel device, in which the output channel state at a given instant, t, is the same as the input channel state at the instant t...
Structure Traditional electronic phasers use a series of variable all-pass phase-shift networks which alter the phases of the different frequency components in the signal. These networks pass all frequencies at equal volume, introducing only phase change to the signal. Human ears are not very responsive to phase differences, but this creates audible interferences when mixed back with the dry (unprocessed) signal, creating notches. The simplified structure of a mono phaser is shown below: An all-pass filter is an electronic filter that passes all frequencies equally, but changes the phase relationship between various frequencies. ...
A quadrature booster, also known as a phase-shifting transformer, is a specialised form of transformer used to control the flow of real power on three-phase electricity transmission networks. ...
Interference of two circular waves - Wavelength (decreasing bottom to top) and Wave centers distance (increasing to the right). ...
The number of all-pass filters (usually called stages) varies with different models, some analog phasers offer 4, 8 or 12 stages. Digital phases may offer up to 32 or even more. This determines the number of notches/peaks in the sound, affecting the general sound character. A phaser with a stages of n generally has n/2 notches in the spectrum, so a 4-stage phaser will have two notches. Image File history File links This is a lossless scalable vector image. ...
An all-pass filter is an electronic filter that passes all frequencies equally, but changes the phase relationship between various frequencies. ...
Additionally, the output can be fed back to the input for a more intense effect, creating a resonant effect by emphasizing frequencies between notches. This involves feeding the output of the all-pass filter chain back to the input, as shown here:
Measured frequency response of a 8-stage phaser with no feedback, dry/wet ratio: 50/50%
Measured frequency response of a 8-stage phaser with 50% feedback, dry/wet ratio: 50/50% The frequency response of a 8-stage phaser with or without feedback is shown. Note that the peaks between the notches are sharper when there's feedback, giving a distinct sound. Image File history File links This is a lossless scalable vector image. ...
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A stereo phaser is usually two identical phasers modulated by a quadrature signal; the output of the oscillators for the left and right channels are a quarter-wave out of phase. This article is about the spacecraft and the mission. ...
Look up quadrature in Wiktionary, the free dictionary. ...
Most modern phasers are a part of a digital signal processor, often trying to emulate analog phasers. Phasers are mostly found as plugins for sound editing software, as a part of a monolithic rackmount sound effect unit, or as "stompbox" guitar effects. A digital signal processor (DSP) is a specialized microprocessor designed specifically for digital signal processing, generally in real-time. ...
A plugin (plug-in, addin, add-in, addon or add-on) is a computer program that interacts with a main (or host) application (a web browser or an email program, for example) to provide a certain, usually very specific, function on demand. ...
The cabinet of a computer is a tall movable closet used to house multiple computers and computer equipment. ...
The TS9 Tubescreamer from Ibanez, a popular stomp box adding vacuum tube-like distortion to the output signal from electric instruments. ...
Image File history File links Phasing_effect. ...
Software development stages In computer programming, development stage terminology expresses how the development of a piece of software has progressed and how much further development it may require. ...
Usage Phasing is a popular effect for electric guitar. The term was often used to refer the original tape flanging effect heard on many psychedelic records of the late 1960s, notably "Itchycoo Park" by the Small Faces, and "Pictures of Matchstick Men" by Status Quo. Eddie Van Halen often used a phaser as part of his signal chain, after his distortion effects, including the amplifier itself: Van Halen used a power attenuator to bring the amp's output down to line level so he could put effect boxes after it. Left: Rosa Hurricane, a heavy metal-style solid body guitar. ...
Flanging is a time-based audio effect that occurs when two identical signals are mixed together, but with one signal time-delayed by a small and gradually changing amount, usually smaller than 20 ms (milliseconds). ...
Psychedelia is a term describing a category of music, visual art, fashion, and culture that is associated originally with the high 1960s, hippies, and the Haight-Ashbury neighborhood of San Francisco, California. ...
The 1960s decade refers to the years from January 1, 1960 to December 31, 1969, inclusive. ...
The Small Faces were a British rock and roll band of the 1960s, led by Steve Marriott and Ronnie Lane with Kenny Jones and original organist Jimmy Winston. ...
This does not cite any references or sources. ...
Edward Van Halen (born Edward Lodewijk van Halen on January 26, 1955[1] in Nijmegen, Netherlands), is a guitarist, keyboardist, songwriter and producer most famous for being leader and a co-founder of the hard rock band, Van Halen. ...
Many electronic keyboard instruments are commonly treated with a phaser to "sweeten" their sounds - the Rhodes and the Clavinet being popular choices. Examples can be heard in Billy Joel's "Just The Way You Are", Styx's "Babe" and Paul Simon's "Still Crazy After All These Years." Led Zeppelin also used a phaser on "No Quarter" to get a very mysterious and spooky sound with the Rhodes. Piano, a well-known instance of keyboard instruments A keyboard instrument is any musical instrument played using a musical keyboard. ...
A Rhodes piano is a musical instrument, a brand of electric piano. ...
The Clavinet D6, the most popular model, introduced in 1971. ...
William Martin Billy Joel (born May 9, 1949) is an American singer, pianist, songwriter, and composer. ...
This article or section does not cite any references or sources. ...
Paul Frederic Simon (born October 13, 1941) is an American singer-songwriter and guitarist, half of the folk-singing duo Simon and Garfunkel who continues a successful solo career. ...
Led Zeppelin were an English rock band who formed in 1968. ...
No Quarter is a song released by English rock band Led Zeppelin on their fifth album Houses of the Holy in 1973. ...
In motion picture or television production, the effect created by a phaser is often used to imply that the sound is synthetically generated, like turning a natural human voice into a computer or robot voice. A phaser was used on C-3PO's voice in Star Wars, for example.[citation needed] Film is a term that encompasses individual motion pictures, the field of film as an art form, and the motion picture industry. ...
C-3PO (pronounced See-Threepio, often shortened to Threepio) is a robot character from the fictional Star Wars universe, created by Anakin Skywalker circa 32 BBY prior to the events of Star Wars Episode I: The Phantom Menace. ...
Star Wars is an epic science fantasy saga and fictional universe created by George Lucas during the late 1970s. ...
The technique works because the frequency filtering produces sound we associate with mechanical sources, which only generate specific frequencies, rather than natural sources, which produce a range of frequencies. A vocoder is a different effect used for similar purposes. A vocoder (name derived from voice encoder, formerly also called voder) is a speech analyzer and synthesizer. ...
Similar effects A specific type of phasing, flanging is a similar effect, in which the notches are linearly spaced. In a flanger effect, the notches are created by mixing the signal with a delayed version of itself. Flangers tend to sound more natural, like the "jet plane whoosh" effect, whereas phasers tend to sound more otherworldy. For comparison of the two effects, check flanging. Flanging is a time-based audio effect that occurs when two identical signals are mixed together, but with one signal time-delayed by a small and gradually changing amount, usually smaller than 20 ms (milliseconds). ...
In its general sense, delay refers to a lapse of time. ...
Flanging is a time-based audio effect that occurs when two identical signals are mixed together, but with one signal time-delayed by a small and gradually changing amount, usually smaller than 20 ms (milliseconds). ...
See also Flanging is a time-based audio effect that occurs when two identical signals are mixed together, but with one signal time-delayed by a small and gradually changing amount, usually smaller than 20 ms (milliseconds). ...
In communications, interference is anything which alters, modifies, or disrupts a message; as it travels along a channel, between a source and a receiver. ...
External links - Phase shifting article on Harmony Central
- Photos of Vintage Pedals & Effects
- Photos of New & Vintage Phaser-Pedals
- The technology of phase shifters and flangers
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