07-15-2022, 01:33 PM
@Reddo84
The distortion may show up when a specific bit of Javascript code is executed in the Chromium browser engine, but that's just a symptom. The heart of the problem is the leakage of parasitic signals into the external DAC; e.g., it's a hardware issue.
There's an offhand chance that this leakage is occurring through what's called "common mode" noise current. The usual hack for solving this in the case of radio frequency noise is to pass the interconnecting cable (the USB cable in this instance) through a ferrite core noise suppressor. Indeed, some cables come with one already in place. In severe cases, the cable may be looped through the core more than once. These devices are cheap so you might try one to see if it helps mitigate the problem. They are often seen on power cables as well, although your experiments so far suggest this isn't the entry point. No harm in trying anyway.
As I said, the input circuitry and signal processing differs in the different DACs you are using so it's not so surprising that you see different responses to the hypothesized leakage. The other day I looked up the miniDSP 2x4HD and found it uses the XMOS Xcore200 microcontroller to handle the USB interface and the Analog Devices ADSP21489 400MHz Sharc microcontroller to handle DSP so there's plenty of opportunities for mischief. No idea about DragonFly and Steinberg other than to guess they have their own solutions.
I'm running out of suggestions. I'm disappointed you haven't received useful advice directly from Allo. Perhaps there are other USBridge Signature owners among the moOde forum members who can chime in?
Regards,
Kent
The distortion may show up when a specific bit of Javascript code is executed in the Chromium browser engine, but that's just a symptom. The heart of the problem is the leakage of parasitic signals into the external DAC; e.g., it's a hardware issue.
There's an offhand chance that this leakage is occurring through what's called "common mode" noise current. The usual hack for solving this in the case of radio frequency noise is to pass the interconnecting cable (the USB cable in this instance) through a ferrite core noise suppressor. Indeed, some cables come with one already in place. In severe cases, the cable may be looped through the core more than once. These devices are cheap so you might try one to see if it helps mitigate the problem. They are often seen on power cables as well, although your experiments so far suggest this isn't the entry point. No harm in trying anyway.
As I said, the input circuitry and signal processing differs in the different DACs you are using so it's not so surprising that you see different responses to the hypothesized leakage. The other day I looked up the miniDSP 2x4HD and found it uses the XMOS Xcore200 microcontroller to handle the USB interface and the Analog Devices ADSP21489 400MHz Sharc microcontroller to handle DSP so there's plenty of opportunities for mischief. No idea about DragonFly and Steinberg other than to guess they have their own solutions.
I'm running out of suggestions. I'm disappointed you haven't received useful advice directly from Allo. Perhaps there are other USBridge Signature owners among the moOde forum members who can chime in?
Regards,
Kent
