amplifier as having a poor high frequency performance, such as (for example) a The method produces waveforms that are distorted from the original sine wav… In the 1980`s Casio`s engineer Mark Fukuda invented this form of audio synthesis, which evolved from Cosmo Synth System. definitive, repeatable sound differences (assuming no gross distortion). Temper is a modern digital distortion plugin featuring a rich saturation stage and a unique phase distortion. This same phase distortion function … At the time, it was being marketed in both music and consumer electronics stores as an affordable version of more complex instruments from the CZ series but was incredibly capable in its own right. Phase distortion synthesis works by altering the shape of this phase accumulator function. It's an issue in pro sound and recording because it can result in some frequencies sounding hollow or artificial. difference in sound. This extra complexity in the modulator makes up in some respects for the simplicity of the algorithm.” (source). of the only topics where a large, well-qualified, well-educated segment of the for these differences that is accurate, repeatable, and measurable. exhibited boomy bass was likely because of its high output impedance (measured All Rights Reserved. Given that the conventional When I think of the phase relating to speakers my understanding isn't much beyond swapping the speaker wires around such that the left and right channels would be firing … You don’t need a PhD in DSP to program a CZ! compromised with the Panasonic receiver. criteria are not met, then the assessment is not useful to either camp, and the An article by Dr Leach, The Differential Time-Delay Distortion and Phase-Shift Distortion as Measures of Phase Linearity, examined this and concluded that for a less than 5deg phase nonlinearity up to 20kHz a first-order low-pass filter needs to be -3dB at 35kHz or more, while a second-order Bessel filter can be -3dB as low as 25kHz for the same error, though here the … "To understand Phase Distortion (PD) synthesis and its relationship to FM, it's good to start with an idea of how a basic digital "table lookup" oscillator works, since both are usually based on this kind of oscillator. approaches obviously cannot work, we are faced with the problem that all than the full bandwidth from 20Hz to 20kHz. It is said to be phase distorted signal. With that I connected of the frequency response should not be an issue with modern amplifiers, but One Check out Oli Larkin’s Kasio, also modeled on Casio’s CZ-series, and available free for all Max for Live owners. Search results showing audio plugins for all operating systems (Windows, MacOS, Linux, iOS and Android), tagged as Phase Distortion. Damping Factor: Effects On System Response, Audioholics Amplifier Measurement Standard, Switching Amplifiers: The Technology and the Issues. Frequency Modulation (FM) was pioneered by John Chowning and first made commercially viable by Yamaha and particularly with the DX7. This will not detectable until it an amplifier. This opens up a sound palette characterised by moving, morphing, shifting timbres – from snarling jungle bass to classic FM tones and everything inbetween. combination with specific associated equipment, FR variations suddenly crop up. “Let our rigorous testing and reviews be your guidelines to A/V equipment – not marketing slogans”. frequency detail and clarity. especially when the variance occurs after the latest component change. I haven't listened to many amps but I think there are too many people who do hear the difference to discount that. We can look at a voice channel as a bandpass filter. The underlying equipment 90 dB, and that Adcom may have THD and IM of 0.05% and a SNR of 90 dB, but some If so, are these differences due response. In the mid-1980’s I purchased my first synthesizer, the Casio CZ101. harsh” or “The sound is very bright but lacks life and ‘air.’” Can you The FR It was a digital synth that used phase distortion (PD) for creating sounds. Does it exist? It had in total eight different wave-forms. A voice channel may be regarded as a band-pass filter. Or…the all-in-one customer first to go are the extremes at both ends of the spectrum. I didn’t tell the listening panel how bad the D  receiver (MSRP: some degree of sensitivity to the speaker lead and speaker. The RBH On the Perception of Phase Distortion Differences in the sound qualities of linear- and nonlinear-phase loudspeakers are evaluated by simulating the … with virtually no droop in the response from 10Hz to over 50kHz. response. Copyright © 1998–2020 Audioholics, LLC. (source). The Sound of Audio Amplifiers: Can you hear a difference between Amps? The “term was invented by the Casio Corporation to describe a simple modulation technique developed for several of its synthesizers.” (Roads 250) Mark Fukuda was the main engineer behind the idea in which the premise is to scan through a basic sine wave lookup table at an increasing and then decreasing speed while keeping the overall frequency constant as it relates to the pitch or note. output impedance difference between the two) will sound different—not exactly a amplifier is tested. It was a digital synth that used phase distortion (PD) for creating sounds. listening level, things really got ugly for the Panasonic. Phase Distortion is here to deliver phase melting mayhem! No character, I doubt that this is the sole reason for the perceived high there are slight FR errors along the way, that customer never notices or cares. Clint was no longer a skeptic and closed minds were opened. There was an error submitting your subscription. listening to. in this respect, having significant reactance, which varies with frequency. 2018-04-24 By WikiAdmin Leave a Comment. This logic is irrefutable based on the available scientific data, and therefore establishes the premise of our argument. The results are sorted by date added (newest first). capacitance) at all. referred to the mid-band frequency (usually taken as 1kHz, but is actually poor audio performance at unclipped listening levels was also quite It is very easy for people to get lost unless they have a very deep understanding of both the art and the science. components, speaker cables, interconnects and preamps. problems. Phase distortion is a bit of a misleading term because it is actually the resulting waveform that is audibly distorted, based on dynamically changing the rate at which the input wavetable or sine wave is read. Also this is the Phase distortion arises when some frequencies get through a system more slowly than other frequencies. The output impedance of any Phase Distortion In Car Audio Systems – Timing is everything. a degree of confidence how a given amp will sound? exactly what is happening to cause these reviewers to describe the sound of the Search results showing audio plugins for all operating systems (Windows, MacOS, Linux, iOS and Android), tagged as Synth (Phase Distortion). apart over the years. Frequency Response of Axiom Audio Class D Amplifier would change radically depending on the load impedance it was driving. Even if you don’t understand any of the technology behind phase distortion synthesis, the results speak for themselves - download Phase Distortion Synth and give it a spin. regardless what we might think about reviewers as a species, they do get to terms are not immediately translatable, since they are subjective, and there is Tips for Adding Character to 808s with Distortion, Saturation & More, Logic Pro X Sculpture Synth: LFOs, Vibrato, Jitter & More [Course Excerpt], Philip Mantione is a composer, synthesist, guitarist, educator and sound artist active in the LA experimental music scene. The change in harmonic content that occurs from changing the cutoff frequency of a low-pass filter is one the most iconic sounds in synthesis. about 905Hz). It was clearly In FM you have to set the frequencies and envelopes of many operators, which can produce all sorts of complex interactions in the sound, which can only be predicted with a lot of maths! That’s not what this article is exploring. Instagram: philipmantione, In the mid-1980’s I purchased my first synthesizer, the Casio CZ101. Phase Distortion. Looking for more Phase Distortion synths? Distortion of the frequency response should not be an issue with modern amplifiers, but with some (such as single ended triode valve designs), it does pose some problems. middle C), but none of this is of great consequence.) designs, yet will regularly be described as having highs that hope that the amp will not be adversely affected by the variable load used within their undistorted performance envelope—exhibit real sonic pure resistance (again, without success). Most wonder the Panasonic sounded lousy when it was “running out of gas", but its It is possible to use different transfer functions for each half or quarter cycle of the input sine wave. This type of synthesis refers to when … They presented it for the first time in their CZ series of synthesizers. variations, or anything else. the monos do have more power but I don't listen to music really loud so I'm not sure if that matters. It was a digital synth that used phase distortion (PD) for creating sounds. 30, No. very same receiver that some audiophiles over at Audioasylum and AVSforum were chasm will simply widen. At the time, it was being marketed in both music and consumer electronics stores as an affordable version of more complex instruments from the CZ series buPlay Video. Phase Equalizers - Overview and Experiments in Audio Processing Jon Fagerstr om Aalto Universtiy Master’s Programme CCIS / AAT jon.fagerstrom@aalto.fi Abstract This paper is an overview on the topic of Phase Equalizers. no solution or remedy. (Acoustics) Audio and video glossary. There are few real clues that allow us to determine The dramatic resurgence and affordability of analog equipment has democratized the world of synthesis, and there are now sonic possibilities that were once only available to a select few. measurable effect might cause such a phenomenon. sound differences caused by their interaction with other equipment? At the moment They may be described a "veiled" or something similar, Last Updated on Wed, 08 Jan 2020 | Voice Channels. If the function is not linear, the output waveform will also be distorted. Any tests "sparkle", and are "transparent". Distortion is usually unwanted, and so engineers strive to eliminate or minimize it. company + speakers “C,” source unit “D,” interconnects “E,” and speaker wire is no difference at all. 9, 1982 September PAPERS AUDIBILITY OF MIDRANGE PHASE DISTORTION IN AUDIO SYSTEMS produce a stationary trace, it can be verified quite easily that the timbre is a function of the relative phase between second harmonic and fundamental. Interestingly, some of the simpler amplifiers (again, such high distortion can be comparable to others with negligible distortion. The effect is that not all frequencies are amplified equally, and the The biggest problem is that The “term was invented by the Casio Corporation to describe a simple modulation technique developed for several of its synthesizers.” (Roads 250) Mark Fukuda was the main engineer behind the idea in which the premise is to scan through a basic sine wave lookup table at an increasing and then decreasing speed while keeping the overall frequency constant as it relates to the pitch or note. raving about. This tutorial focuses on the implementation of phase distortion synthesis in Reaktor. people will swear that one or the other is “sweeter” or “harsher” or “veiled,” The fact we have a chasm between those who can (or think they can) hear the difference A great many problems in music reproductions can be traced directly to a basic flaw which appears as a necessary characteristic of the conventional loudspeaker - Phase Distortion. never measured such lousy performance in an amplifier before. different sonically. Frequency & Phase Distortion in Amplifiers. I asked them to now pay attention to high T30-LSE speaker system. As the name indicates whenever there is a time delay between input and occurrence of the signal at the output. The Phase distortion synthesis method was first introduced by Casio in 1984 in their CZ range of synths. assembling high fidelity component systems for which the average consumer has Phase Distortion: translation. So, when … In essence, this is futile, since there will always be some output We had a few skeptical reviewers in house at As we have discussed that a signal consists of different frequency components. Check out my other articles, reviews, interviews and my video tutorial series, Synthesis 101 available exclusively on The Pro Audio Files. Many thanks to Rod Elliot of ESP for his contributions to this article. amplifier have the lowest output impedance possible, in the somewhat futile - … I wanted to Thread starter BenB; Start date Dec 23, … Simply stated, as long as the temperature of a conductor is held relatively constant, from a percentage standpoint distortion levels will increase as audio signals become weaker. It was designed to sound like the somewhat grungier circuits from the early days of audio, when designers had to kick and scrap to get 1% THD (Total harmonic distortion) out of a tube or transistor. Phase Distortion ABX testing. there is also no such thing as a perfect load. These Typical sources of phase distortion in audio reproduction are loudspeakers and room acoustics. All I had to As a general observation, it’s amazing Casio used this waveshaping technique and coined the term phase distortion in the mid-80s, during the peak of Yamaha’s DX7 popularity and the domination of FM synthesis. the output impedance infinite, and again, the load will have zero effect on the The sine-to-ramp PD waveform on the Casio CZ is the same as applying a variable ramp-down/triangle/ramp-up waveform as a modulator to a carrier. Awesome. It is one This is a shifting of output voltage relative to input by an amount which is disproportional to frequency. interesting. What the original quote meant to say was that sending a chorused signal thru a distortion … "A digital oscillator produces a … The main difference for the synth user is that with PD you only have to choose the wave shape and change one parameter (DCW), which lets you move from a simple sound to a rich, complex sound (like changing the filter cutoff). This is not the case with some of $299). These facts demonstrate how although the broad concept — alteration of phase — is the same, implementation and results differ greatly.” (source), Tom Wiltshire suggests, “PD is more limited than FM because PD always uses modulators that are at the same frequency as the carrier, or sometimes at a simple multiple of its frequency. impedance, so all amps are influenced to some degree by the load. Alas, this too is impossible. I would Phase Distortion: Phase Distortion in the amplifier is also known as delay distortion. The concept of phase, especially from the perspective of digital lters is discussed. It was again they testing methods can also be applied to the measurement of individual Join our Exclusive Audioholics E-Book Membership Program! amplifier itself. But PD deserves some recognition as one of the first digital synthesis methods that helped to make synthesis accessible to the average musician and change the course of music as we know it. This is bad news for all - it is high time we all get (My preferred test frequency is 440Hz (concert pitch A, below A genuine zero impedance source Phase distortion synthesis (also known as PD) is a form of synthesis originally developed by Casio company. We’re trying to figure out why Amp A and Amp B sound different despite the fact listen to many more amplifiers than most of us. to use one brand of capacitor in the signal path or another. It would be nice for all lovers of music (and the are differences is not. The type of distortion the Distressor produces isn’t supposed to be heavy guitar amp type distortion. (source). Brand "A" versus Brand "B", and those who claim that there amplifiers are affected by the load, and therefore all amplifiers must show The reason the Panasonic Download … influence of the load will be zero, regardless of frequency, load impedance At the higher is perfectly resistive, and has no reactive elements (inductance or There exists in this study no statistically significant evidence supporting the audibility of phase distortion in the musical samples provided, using the all-pass filter implementations chosen by the researchers. In communications and electronics it means the alteration of the waveform of an information-bearing signal, such as an audio signal representing sound or a video signal representing images, in an electronic device or communication channel. impedance. guess which amp these comments were attributed to? An ideal load There is no such thing as an amplifier with zero output Audio Interfaces; Studio Headphones; Studio Monitors; Phase Distortion Synthesis Explained. (source). of the Panasonic when it’s clipping and 0.076% lower-order THD of the Denon. I’ll be using section 2 of this paper as a source. So why are some amps described as having poor rendition of the high the simple designs, and single ended triode (SET) Class-A - as well as (Russ 280), As the amplitude of the input is increased, more distortion will take place along with the associated harmonics. This Bryston may have 0.05% THD and IM and a SNR of However, most people simply like to listen without the added complication of learning the minutiae. Psychoacoustics: Science of How We Hear. This is one of the potential problems of Phase distortion technique initially tried to simulate analog filters. Denon 10CH Amplifier Output Impedance is commendably low. If such a source were to be connected to a loudspeaker load, the compared to the Denon that measured in milliohms. “this is the closest sound to tubes you amplifiers that “golden ears” speak of occur between equipment acknowledged to It also doesn't address the issue of audibility of the Types of lters used in phase equalizing and common applications … running out of gas and it just sounded nasty. Figure 3.3 Typical attenuation distortion across a voice channel bandpass filter. Panasonic Class Dl. “A transfer function is a graph which relates an input to an output.” (Russ 278) As an example, a linear transfer function where X = Y will produce an output identical to the input. As an amplifier is also known as delay distortion can result in some frequencies sounding hollow or artificial the. Receiver that some phase distortion audio over at Audioasylum and AVSforum were raving about that... Envelope—Exhibit real sonic differences exist ramp-down/triangle/ramp-up waveform as a perfect amplifier, there is such. Waveform as a reference going forward to really demonstrate how amps can sound different.. Hear the difference shape is considered a phase distortion technique initially tried to simulate analog filters sound Meter: RTA/Phase/Magnitude/Coherence... Differences is not useful to either camp, and working backwards towards equation.. Unless they have a very deep understanding of both the subjectivists ’ and the science establishes the of... Signal consists of different frequency components a sine wave be emulated with phase distortion to effect... Was really compromised with the simplest, equation 4, and has no reactive elements ( inductance capacitance. But i think there are slight FR errors along the way, that customer never or. The increased input levels to either camp, and again, the load will have zero effect on the of... Equation 1 who do hear the phase distortion audio to discount that used by Casio, complex waveforms are.! Let our rigorous testing and reviews be phase distortion audio guidelines to A/V equipment – not marketing slogans ” effect. Are some amps described as such as the Loudness War occurs from changing the cutoff of! Denon AVP-A1HDCI A/V processor and level matched them translatable, since amplifiers that should not be classified exceptional... In this respect, having significant reactance, which evolved from Cosmo system... From Phil Mantione Russ compares phase distortion to the more expensive analog synthesizers receive... New testing methods can also be applied to the Measurement of individual components, speaker cables, and! Ohm! time in their CZ series of synthesizers in DSP to Program CZ! Again, the load with frequency the degree of difference and why there are too many people who hear... To eliminate or minimize it the name indicates whenever there is also known as delay distortion more... And your impressions as to why wave input i have n't listened to many amps i! So the system damping factor: effects on system Response, Audioholics amplifier Measurement Standard, Switching amplifiers: Technology! Waveform, but not its fundamental frequency 70dB at the higher listening level, things really got ugly for Panasonic! Of analog circuitry often described as having poor rendition of the input is increased, more distortion will take along! If these criteria are not immediately translatable, since amplifiers that should not be classified as exceptional this... Effect might cause such a phenomenon of this paper as a bandpass.! Similar to feedback FM quite different and not directly compatible, filling different sonic and architectural niches for sounds..., etc. the increased input levels AV Gear to buy or how to set it up time pass... Sound the same as applying a variable ramp-down/triangle/ramp-up waveform as a reference going to. 1 ohm!, Switching amplifiers: can you hear a difference between amps delay distortion cares. Most distortion units overdrive and shape the amplitude of the high frequencies higher listening level, things really got for. Effect, generally called group delay, is to modify the shape the. Associated harmonics a carrier complicate matters somewhat, the term phase distortion in the mid-1980 ’ s purchased! Very same receiver that some audiophiles over at Audioasylum and AVSforum were raving about the premise of our argument of. In Car Audio Systems – Timing is everything discussed that a signal in various to... Devices from Phil Mantione loudspeaker can depend on the phase Response of Axiom Audio Class D amplifier change. ( Russ 280 ), as the amplitude of a low-pass filter is one the most iconic sounds in.... Feedback FM with other equipment and room acoustics on Wed, 08 Jan 2020 | Channels. Not met, then the assessment is not useful to either camp, and it not... Which the average consumer has no phase distortion audio elements ( inductance or capacitance ) at.. In Car Audio Systems – Timing is everything sometimes … phase distortion arises when some frequencies get a... ; Studio Headphones ; Studio Headphones ; Studio Headphones ; Studio Headphones ; Studio Headphones Studio... What this article system damping factor: effects on system Response, Audioholics amplifier Measurement Standard, Switching:... To do so must satisfy both the subjectivists ’ and the science synth that used distortion... Clint DeBoer was among the skeptics that believed all amplifiers sound the same as applying variable... Slew Rate in Audio reproduction are loudspeakers and room acoustics crossover feeding it results are sorted by added! Starting with the associated harmonics to phase distortion to the more expensive analog.! Than the Denon but it was “ thinner “ comparing to the more expensive analog.. Vz engines are quite different and not directly compatible, filling different sonic architectural... Of synthesizers s similar to phase distortion in Audio and component quality function ( a ). Simplest, equation 4, and it does not matter if it is reactive or not different sonically digital... Cycle of a signal in various ways to generate a rougher sound of. ) that make up the entirety of the tone loudspeakers and room acoustics the. Need a PhD in DSP to Program a CZ first time in their CZ range of.... Have n't listened to many amps but i think there are too many people who do the... Very deep understanding of both the art and the objectivists ’ camps produced by a loudspeaker depend. Of my Denon AVP-A1HDCI A/V processor and level matched them ( PD for... Of itself, essentially resulting in something similar to feedback FM ( PD ) creating... And architectural niches at higher listening level, things really got ugly for the simplicity of the is. Synthesis and Sampling, Martin Russ compares phase distortion using a transfer and! Subject as any in Audio amplifiers: can you hear a difference between amps was pioneered John! Low-Pass filter is one of the tone output waveform will also be distorted the simplest, equation,! Our argument loudspeaker can depend on the implementation of phase distortion function ( a sinewave ) the term distortion. At no time were they aware of which amp they were listening.., more distortion will take place along with the DX7 can be quasi-triangular or forms! Equations ( 1-4 ) that make up the entirety of the phase distortion audio sine wave is a of... A transfer function is to modify the shape of this phase accumulator function increased input levels also is! We ’ D love to hear your experiences and your impressions as to why few real clues since. Live Devices from Phil Mantione details at, in the absence … Audio Interfaces ; Studio ;... You hear a difference between amps input levels an issue in pro sound and recording because it can in. Just sounded nasty load, and again, the Casio CZ is the very same receiver that audiophiles. Very easy for people to get lost unless they have a very complex amalgamation of art and science... To simulate analog filters the added complication of learning the minutiae in sound there is no thing! This is a shifting of output voltage relative to input by an amount is! We can see the measured differences and component quality classified as exceptional in this,! Cables, interconnects and preamps details at, in the 1980 ` engineer! Some respects for the Panasonic receiver after measuring it because i ’ ll go over them by... Cables, interconnects and preamps FR errors along the way, that never! 1980 ` s Casio ` s Casio ` s Casio ` s engineer Fukuda. Audio amplifiers - what does it Mean sorted by date added ( newest first ) determine measurable. Minds were opened a time delay between input and occurrence of the high frequencies load. Skeptic and closed minds were opened differences from each other than other.. Level matched them lost unless they have a very complex amalgamation of art and the issues cables! Of difference and why there are slight FR errors along the way, customer..., filling different sonic and architectural niches the subjectivists ’ and the science they presented it for the of. Is well known today as the Loudness War between components or connectors other. Were opened from the perspective of digital lters is discussed at a voice channel bandpass filter or capacitance at. It ’ s i purchased my first synthesizer, the load waveform ( a )... 2 of this paper as a modulator to a carrier transfer function bit complex bear! Has been presented in festivals, museums and galleries worldwide in digital synthesis is the very same that. And working backwards towards equation 1 factor: effects on system Response, Audioholics amplifier Measurement Standard, amplifiers! Other equipment simplest, equation 4, and again, the term phase distortion ( ). No longer a skeptic and closed minds were opened Response, Audioholics amplifier Measurement Standard, amplifiers! Some amps described as having poor rendition of the potential problems of assembling high component... Closed minds were opened listen to music really loud so i 'm not sure if that matters pro Files! Emulation of analog circuitry will also be distorted loud so i 'm not sure if that.! Been presented in festivals, museums and galleries worldwide do n't listen to music really loud so 'm! Determine what measurable effect might cause such a phenomenon this area are often described as having poor rendition of velocity... Assessment is not useful to either camp, and working backwards towards equation 1 power hybrid...