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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 17 Aug 2018
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      I swear everything about this makes perfect sense and serves a purpose.pic.twitter.com/GWAhaoeSig

      5 replies 12 retweets 70 likes
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    2. Hector Martin‏ @marcan42 17 Aug 2018
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      So Behringer makes this nifty set of digital wireless mics with a USB dongle form factor receiver. Sadly, the Switch does not like it (probably because it only supports 48kHz 24bit stereo mode).

      1 reply 0 retweets 6 likes
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    3. Hector Martin‏ @marcan42 17 Aug 2018
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      However, it has an undocumented analog mode, which uses the SuperSpeed pins on a USB 3.0 Type A connector (even though this isn't 3.0) for analog audio and status, to work with some Behringer mixers. So I broke it out to minijack stereo (two mics, two channels).

      4 replies 1 retweet 10 likes
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    4. Matt "Mr. Asmus" Rasmussen‏ @mrasmus 18 Aug 2018
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      Replying to @marcan42

      These the ULM200's? I was looking at those for a thing, and had no idea analog output was possible for them; might make them perfect for what I need.

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 18 Aug 2018
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      Replying to @mrasmus

      Yup. The fact that they have analog output is documented ("Ultra-compact USB receiver with dual mode analog/digital audio interface"), but not how it works. It's intended for their mixers with a dedicated port for this.

      1 reply 0 retweets 0 likes
    6. Matt "Mr. Asmus" Rasmussen‏ @mrasmus 18 Aug 2018
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      Replying to @marcan42

      Yeah, I’d seen that and assumed it was a weird negotiated thing; didn’t think about them using SS pins like that. If it’s as simple as cutting D+/- and wiring extras to a cable, I can happily hack that together. Is sound quality decent on them? Standard dynamic fare, I take it?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 18 Aug 2018
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      Replying to @mrasmus

      Yeah, bit of background hiss but nothing major. The range is pretty limited and they're 2.4GHz so don't expect great performance if the spectrum is crowded, but they're digital so when they work they sound great (and loss of signal doesn't pop).

      8:07 AM - 18 Aug 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Hector Martin‏ @marcan42 18 Aug 2018
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          Replying to @marcan42 @mrasmus

          Basically I'd consider them a small room tool, though that might be improvable by hacking the antennas. Underlying tech is this: http://www.ti.com/lit/ml/swab002/swab002.pdf … and here's the innards (+DAC on rear side, also testpoints for output pins).pic.twitter.com/lkvQhcMUxo

          1 reply 0 retweets 0 likes
        3. Hector Martin‏ @marcan42 18 Aug 2018
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          Replying to @marcan42 @mrasmus

          One SS pair (I didn't pay attention to which) has the two channels (in connection order, the two mics are dynamically allocated to a channel). The other pair has RST in (active low) & status (active high = at least one mic is connected).

          1 reply 0 retweets 0 likes
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