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DIY High Speed (480Mbps) USB Isolator for audio using ISOUSB211

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drksy:

--- Quote from: baconsteak on November 29, 2022, 07:57:40 am ---Nice Job! Did you by chance measure the round trip latency with and without on your M4? I'm wondering if this setup would be good for use with a guitar.

--- End quote ---

I was not able to measure any difference in round-trip latency with or without the USB isolator whatsoever. With 48kHz and 256 samples buffer, I'm getting precisely 12.771 ms delay with and without the isolator. This was measured with a loopback connecting analog input to the analog output.

I think if anything, the delay might be in the order of nanoseconds in input to output skew, nothing in the ballpark of milliseconds that you could measure as audio latency.


--- Quote from: jonpaul on November 29, 2022, 03:12:28 pm ---no need for this.

Use TOS-link optical digital audio, complet isolation.

format SPDIF.

Most high quality external DAC, ADC use TOS-link, SPDIF or AES EBU

Jon

--- End quote ---

The problem with Toslink or AES EBU is that then you have two interfaces to control. One interface connected to PC, and another interface connected to the speakers. It's a real pain. Even simple things like recording a track and monitoring becomes a nightmare because you have to manually route the digital output back and fourth through two interfaces for every channel - assuming Toslink even supports many channel outputs. It's much nicer to just have one interface.


--- Quote from: Nominal Animal on November 29, 2022, 07:53:10 pm ---
--- Quote from: jonpaul on November 29, 2022, 03:12:28 pm ---no need for this.

Use TOS-link optical digital audio, complet isolation.
--- End quote ---
On the other hand, even microcontrollers like Teensy 4.0 and 4.1 can do over 25 Mbytes/sec (I've tested this over plain USB Serial; you can do much better with USB bulk transfers), which corresponds to over 150 channels at 24 bits per sample at 48 kHz sampling rate, or over 75 at 96 kHz.

This particular use case –– Teensies –– is exactly why I too am waiting for ISOUSB211 to become available.

--- End quote ---

It's finally available!  :D

jonpaul:
Alternative solutions, beside TOS-LINK, industry standard AES-67 for Audio over IP, via Ethernet, up to 128 channels 24 bit, with précis time stamp.

For wired  2 ch AES/EBU, AEQ3id, SP/DIF, use our high CMRR Shielded transformers.

jon

drksy:

--- Quote from: jonpaul on February 15, 2023, 04:59:20 am ---industry standard AES-67 for Audio over IP, via Ethernet, up to 128 channels 24 bit, with précis time stamp.

--- End quote ---

Yes, this is a good suggestion of course, but maybe suited for bigger studios. I don't know if I can afford such equipment for a small home studio!

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