Fidelix HiFi USB Noise Filter.

A USB noise filter with common mode choke and ferrite beads is available to reduce common mode noise.
Silver and Black.

The following are measurements from 2 MHz to 43.5 GHz by ROHDE&SCHWARZ. Although the CPU and memory clocks in the PC and the harmonics of the common mode noise are certainly likely to be reduced, the signal quality is reduced as shown in the High speed (480Mbps) eye pattern of USB 2.0 below, and the dense red part is increasing, High frequency noise is also reduced and improved to better waveform.

LeCroy's 2GHz scope was sufficient for USB2.0 measurement. Of course, the transmission path is impedance consistent with the differential microstrip line.

Built-in filter to reduce 5V power noise.
This noise filter is inserted into the USB terminal, but you can use this power filter for both while switching between bus power and self power. The power filter circuit also takes into account the stability of inrush current and feedback.

The built-in filter alone has enough effect, but when the ultra-low-noise power supply (5V1A) of the Fidelix is combined, the outlook of the distant sound becomes even better, and the clear space is reproduced.