That is a common mode choke. It does not present an impedance to the differential signal wires.
And also, quote the article, "Of course, the bandwidth of a signal is about the rise time of the signal, not the clock frequency."
-snip-
"But, “sometimes an OK answer NOW! is better than a good answer late.” Sometimes, we just don’t have all the information we need to get a good answer and rather than wait around until we can get all the information we need, we have to make do with what we have."
-snip-
"Based on this assumption of the rise time being 7% the period, we can estimate the bandwidth of the signal as 5 times the clock frequency."
And also, quote the article, "Of course, the bandwidth of a signal is about the rise time of the signal, not the clock frequency."
-snip-
"But, “sometimes an OK answer NOW! is better than a good answer late.” Sometimes, we just don’t have all the information we need to get a good answer and rather than wait around until we can get all the information we need, we have to make do with what we have."
-snip-
"Based on this assumption of the rise time being 7% the period, we can estimate the bandwidth of the signal as 5 times the clock frequency."
These products regenerate the data signal to the dac and seam to perform better than the jitterbug. They benefit personal computers more than a designated streamer. I really wish we had a DIY option or at least a PCB only option.
https://wyred4sound.com/products/digital-converters/recovery
USB REGEN? – UpTone Audio
https://wyred4sound.com/products/digital-converters/recovery
USB REGEN? – UpTone Audio
On its way 🙂
That's the reason I started the thread.
I will post tomorrow my findings.
That's the reason I started the thread.
I will post tomorrow my findings.
It is more commonly called knee frequency.
We are getting into the realms of signal integrity here....
USB is not such a bad interface, and most audio will operate at lower speeds with no problem.
Ethernet connections pass through a CM and Diff mode choke before the cable.....
We are getting into the realms of signal integrity here....
USB is not such a bad interface, and most audio will operate at lower speeds with no problem.
Ethernet connections pass through a CM and Diff mode choke before the cable.....
Had to rush of to work, so my reply was rather brief.
Bandwidth or Knee frequency gives you an indication of the highest frequency harmonic of the square wave that you need to be concerned with when doing an interface especially in terms of Si and EMC. The faster the signal rise time the higher the harmonic content is of the square wave, a square wave being made up of multiple sine harmonics.
Square Wave Signals : Mixed-Frequency AC Signals - Electronics Textbook
Periodic Waves and Fourier Transform
As stated in a previous post, too many common mode chokes on a data line can cause issues, and with USB there is a good chance that if your source is a PC, Tablet or similar then there will already be a common mode choke on the output. It is common practice to route a USB interface with the provision to fit one of these chokes for passing EMC compliance. Common mode noise will transmit from a cable, hence the common use of ferrites on cables, for EMC compliance. So adding more common mode chokes in line is not a good idea and even the jitterbug notes mention it is best to remove the device before doing any intensive data back up using the USB. I have always questioned how much use these devices are with USB audio and how bad the noise is down the USB lines, personally I think these and similar devices sold for audio use are feeding a desire to cure an almost non-existent problem and one where there is little data showing the effect of these modules. I have read of some using multiple devices on their USB line!!!
The Ethernet interface as I mentioned has as part of the specification a set of magnetics that go very near (and are often built in to the Ethernet connector) to address the issue of common mode noise, the interface is rigorously defined).
Bandwidth or Knee frequency gives you an indication of the highest frequency harmonic of the square wave that you need to be concerned with when doing an interface especially in terms of Si and EMC. The faster the signal rise time the higher the harmonic content is of the square wave, a square wave being made up of multiple sine harmonics.
Square Wave Signals : Mixed-Frequency AC Signals - Electronics Textbook
Periodic Waves and Fourier Transform
As stated in a previous post, too many common mode chokes on a data line can cause issues, and with USB there is a good chance that if your source is a PC, Tablet or similar then there will already be a common mode choke on the output. It is common practice to route a USB interface with the provision to fit one of these chokes for passing EMC compliance. Common mode noise will transmit from a cable, hence the common use of ferrites on cables, for EMC compliance. So adding more common mode chokes in line is not a good idea and even the jitterbug notes mention it is best to remove the device before doing any intensive data back up using the USB. I have always questioned how much use these devices are with USB audio and how bad the noise is down the USB lines, personally I think these and similar devices sold for audio use are feeding a desire to cure an almost non-existent problem and one where there is little data showing the effect of these modules. I have read of some using multiple devices on their USB line!!!
The Ethernet interface as I mentioned has as part of the specification a set of magnetics that go very near (and are often built in to the Ethernet connector) to address the issue of common mode noise, the interface is rigorously defined).
There are hundreds of USB hubs for industrial use that isolate the bus galvonicly, mainly to protect controlling equipment from operating machinery etc. so if a piece of equipment fails it doesn't take out everything else... The design I posted earlier were for such isolation. Is this needed for domestic USB audio to a DAC.... In my view no.🙂
These are USB hubs plain and simple, probably using a device very similar to this one, this looks like the Regen's main IC if you follow the pin outs....
There's even a schematic...
http://ww1.microchip.com/downloads/en/DeviceDoc/evb2412.pdf
And an evaluation board:
ftp://ftp.smsc.com/pub/usb/evb2412user.pdf
So all the hard work has been done for you....😀😀
All that's needed is a bit of marketing BS and it will become an audiophile USB regen/reclocker device🙂
I tried Würth Filter, unfortunately JitterBug is better. Würth Filter does improve sound, but it is not good as JitterBug.
Blind test is a friend, who don't know what am I changing. Würth Filter improves dynamic, the sound become more deep, but highs become a little muffled. JitterBug improves any kind of sound, without negative aspects.
I found more interesting stuffs. I listen, and share what am I hearing. And always call a friends to do a blind test for them.
Have a fun!
Beat regards,
Angel
Have a fun!
Beat regards,
Angel
Thanks for the input. I should be able to offer a subjective report on the device soon, for whatever that's worth to people.
Some people claim improvements from removing the 5V supply line from USB cables. Is it possible that noise on this line will also capacitively couple into other areas, even if the DAC isn't actually making use of it?
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