From Brian Willoughby Sent Mon, Oct 15th 2018, 16:04
From Brian Willoughby Sent Mon, Oct 15th 2018, 16:04
Where is =E2=80=9Cphase locking=E2=80=9D mentioned in relation to = MatrixBrute issues? Was that part of this thread, or on some forum? I don=E2=80=99t know the details in Arturia=E2=80=99s case, but it=E2=80=99= s fairly common for traces on one side of a board to affect those on the = other side, or in the middle layers. This can be common because the = layout engineer is not the original designer of the circuit. It=E2=80=99s = only after the boards come back from fabrication and extensive testing = is done that the crosstalk is found. Scott described noise, but trace = routing generally causes bleed-through of one sound into another. I = would expect different causes for hiss, such as noisy op-amps, gain = resistors in the wrong place, or simply too many gain stages to allow = for low noise. Brian On Oct 15, 2018, at 7:52 AM, A. Horton <xxxxxx.xxxxxx@xxxxx.xxx> wrote: > Can someone explain what the phase locking is and why it's a problem > in actual practical use (ie. in a patch that isn't just raw oscs on an > oscilloscope)? > On Mon, Oct 15, 2018 at 9:30 AM Lorne Hammond <xxxxxxxx@xxxx.xx> = wrote: >>=20 >> well these are multilayer pcbs with microscopic tolerances, its not = like working around traces on an older analog board. >> next gen stuff. I might be wrong. lorne >>=20 >> On Oct 15, 2018, at 12:13 AM, Lorne Hammond <xxxxxxxx@xxxx.xx> wrote: >>> i thought is was because a trace had to pass fairly close to part of >>> the (filter?) circuit and when they looked at the pcb board layout = they realized they were too close, but it being fairly complex and tight = they decided they had to live with it and if your playing it is not = noticeable but its there when you are not playing? Does that spound = right to anyone else?. >>> Not bad engineering just a compromise in board layout. Broke a pcb = trace layout rule to achieve some other needs. >>>=20 >>> lorne >>>=20 >>> -----Original Message----- >>> From: Brian Willoughby <xxxxxx@xxxxxxxxxxxx.xxx> >>> Sent: October-14-18 2:26 PM >>>=20 >>> Thanks for the review. >>>=20 >>> I assume that you mean high noise to signal ratio, or low signal to = noise. Basically, your description is telling me that this thing has a = high noise floor, and the various distortion/gain stages conspire to = make that worse. Apparently, nothing can be done about this ever-present = noise, even with the gain settings toned down. >>>=20 >>> Sounds like a description of a vintage synth - especially one with = chorus (although this one doesn=E2=80=99t). >>>=20 >>> Brian >>>=20 >>> On Oct 14, 2018, at 8:44 AM, Scott Fox <xxxxxxxxx@xxxxx.xxx> wrote: >>>> =E2=80=A2The architecture and number of gain stages and distortions = give the machine a fairly high signal to noise ratio. Even with all = filters closed, oscillator levels at 0, filter outputs down and so on, = my machine gives off a wee bit of noise. Depending on what you're doing, = this can get pretty noticable in the synth. I've experience this across = multiple units and what I wrote on this point was pretty much Arturia's = summation of its noise in my messages with them. Basically, it's a part = of the machine. Take it how you will. It hasn't been much of a problem = for me but it does but some people whom favor a pristine sound. >>>=20 >>=20 >=20