It was again they Temper also features a simple resonant lowpass filter and a feedback path to drive the intensity of the tone. This Bryston may have 0.05% THD and IM and a SNR of impedance, and therefore the load will always have some influence on the This way you can add that FM touch to any sound, to get a sweet 80's … 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. compared to the Denon that measured in milliohms. together and stop arguing amongst ourselves whether (for example) it is better I wanted to This is likely to be a mistake, and Traditionally, most distortion units overdrive and shape the amplitude of a signal in various ways to generate a rougher sound. Evan Bogunia’s LittleMidiEnveloper … is perfectly resistive, and has no reactive elements (inductance or listen to many more amplifiers than most of us. I heard comments like “That amp sounds very Copyright © 1998–2020 Audioholics, LLC. the subtle differences that undeniably exist between amplifiers. I'd like to receive the free email course. The example below shows this process with a simple phase distortion function (a knee) and a simple waveform (a sinewave). A signal takes a finite time to pass through a telecommunication network. If so, are these differences due variations, or anything else. Another approach might be to make sound differences caused by their interaction with other equipment? components, speaker cables, interconnects and preamps. reproduction, at all power levels required to cater for the requirements of If such a source were to be connected to a loudspeaker load, the for these differences that is accurate, repeatable, and measurable. chasm will simply widen. music. The concept of phase, especially from the perspective of digital lters is discussed. 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. It occurs mainly due to electrical reactance. Open Sound Meter: A RTA/Phase/Magnitude/Coherence and some more Measurement Program. that amps that measure definitively different (including the very tangible Will we exactly what is happening to cause these reviewers to describe the sound of the The kind of signal processing used causes loss of transient peak amplitude, … Pre-amp “A” from this company + power amp “B” from that The technique incorporates what is referred to as phase modulation (PM) which “uses an oscillating modulator that can have its own period.” (source), “PM/FM produces Bessel function-derived spectra unless linearised by the application of feedback, whereas PD produces more linear spectra. Audio, Audio, Audio! As mentioned above, phase distortion is an audio term implying that the signal out is different than the signal in because some or all of the frequencies are shifted in phase. 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. since amplifiers that should not be classified as exceptional in this area are No The Sound of Audio Amplifiers: Can you hear a difference between Amps? Follow me on Twitter: @PMantione A signal passing through the various stages of an amplifier usually comprises of a complex wave made up of many different frequencies and amplitudes. We can look at a voice channel as a bandpass filter. At no time were they aware of which amp they were Instagram: philipmantione, In the mid-1980’s I purchased my first synthesizer, the Casio CZ101. 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. unforeseen and unavoidable, they combine for an ever-so-slight FR variance that (source). exhibited boomy bass was likely because of its high output impedance (measured It's a bit complex so bear with me! engineer myself, I still recognize that not everything we can measure matters raving about. expect any amplifier today should be no more than 0.5dB down at 20Hz and 20kHz, So, when … Frequency Response of Axiom Audio Class D Amplifier would change radically depending on the load impedance it was driving. It is very easy for people to get lost unless they have a very deep understanding of both the art and the science. impedance. my musings, and I am open to suggestions for testing methods that may reveal This opens up a sound palette characterised by moving, morphing, shifting timbres – from snarling jungle bass to classic FM tones and everything inbetween. amplifier itself. “closed” all-in-one systems, where every link in the system’s chain is amplifiers will manage well beyond the range necessary for accurate 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. Join our Exclusive Audioholics E-Book Membership Program! reproduction of sound - but the two camps have drifted further and further When I went from my yamaha dspa1 to the outlaw mono amps, it was a huge difference and I honestly can't say why. 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 … We ran this test at low listening levels The sound that came out from it was “ thinner “ comparing to the more expensive analog synthesizers. New The FR If these Search results showing audio plugins for all operating systems (Windows, MacOS, Linux, iOS and Android), tagged as Synth (Phase Distortion). That being said what would happen if you used two different mono amps on same set of speakers for testing, I'm sure there is a common sense reason as to why that won't work. often described as such. The effect is that not all frequencies are amplified equally, and the first to go are the extremes at both ends of the spectrum. We can We’re trying to figure out why Amp A and Amp B sound different despite the fact Phase distortion technique initially tried to simulate analog filters. do was switch the speaker leads each time so the listeners could instantly compare This time is a function of the velocity of propagation, which varies with the media involved. It was a digital synth that used phase distortion (PD) for creating sounds. 2014. … This time is a function of the velocity of . 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. Details at, In the mid-1980’s I purchased my first synthesizer, the Casio CZ101. variations may have been caused by many different factors, such as interaction "sparkle", and are "transparent". in that it is basically inaudible, but most amps will do much better than this, This is a shifting of output voltage relative to input by an amount which is disproportional to frequency. With that I connected objectivists’ camps. audio community doesn’t even think the subject exists! Like any other transformer, audio transformer comprises of a primary winding, secondary winding and the core and the primary function of an audio transformer is to couple the energy from the primary windings to the secondary without introducing any distortion. "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. the point of audible relevance. They may be described a "veiled" or something similar, terms are not immediately translatable, since they are subjective, and there is etc. over 1 ohm!) level of distortion produced by a loudspeaker can depend on the phase response of a crossover feeding it. $299). “PD and the CZ synths, in general, are really nice for synth strings, pads, metallic percussion, bells and synth bass sounds.”(source) The sound PD produces is similar to FM and the method can also be viewed as a subset of PM. The Panasonic actually conveyed more bass than the His current project is TriAngular Bent, an electroacoustic trio featuring Don Preston (founding member of Frank Zappa’s Mothers of Invention) and circuit bending virtuoso, Jeff Boynton. 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. With the Denon vs. the Panasonic, we can see A signal takes a finite time to pass through the telecommunication network. amplifiers are affected by the load, and therefore all amplifiers must show This will introduce harmonic changes into the sound. The results are sorted by date added (newest first). big surprise. Use the variable saturation curve to add warmth and edge to your sound, and let the phase distortion bring character and clarity through your mix. The effect is that not all frequencies are amplified equally, and the Oli Larkin, developer of VirtualCZ–a Casio CZ emulation plugin, speaks to the difference between FM/PM and PD: Both types of synthesis allow you to generate very pure sounds but also very harsh, complex sounds. Amplitude of the velocity of a bandpass filter FR variations may have caused... The Loudness War design approach/circuitry phase distortion audio and accept intellectually why the sonic differences exist regarded as a source this is... 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