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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 20 Oct 2019
      • Report Tweet
      • Report NetzDG Violation

      Someone claimed that the slider mute switches on Google Home products are software-driven on HN with zero evidence, so I checked. At least on the Home Mini it's hardware. (Also, if you make hard claims on the internet with zero evidence, you're an asshole).

      8 replies 29 retweets 187 likes
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    2. Hector Martin‏ @marcan42 20 Oct 2019
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      AFAICT the mics are TDM mics in a stereo config (shared data line, idling at average of ~1/2 Vcc, don't have scope with me to check). That's connected to a single AND gate (SN74LV1T00 or equiv), the other input comes from the mute switch.

      1 reply 2 retweets 15 likes
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    3. Hector Martin‏ @marcan42 20 Oct 2019
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      When the mute is engaged, the output of the gate drops to 0V, and that is what goes to the SoC (after a divider, the SoC is probably 1.8V logic while the mics/AND are at 3.3V).

      2 replies 1 retweet 17 likes
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    4. doragasu‏ @doragasu 21 Oct 2019
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      Replying to @marcan42

      I have only read your tweets about this, so maybe the question is stupid, but here it is: is the AND control gate software driven? Or is it connected directly to a hardware switch? Because if software driven, the mute function is still software driven.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 21 Oct 2019
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      Replying to @doragasu

      Hector Martin Retweeted Hector Martin

      The next tweet notes the direct path from the switch to the AND gate.https://twitter.com/marcan42/status/1186110966984916994?s=19 …

      Hector Martin added,

      Hector Martin @marcan42
      I traced the path from the hardware switch, through a filter/debounce network, to the AND gate, and from the mics to the AND gate. So unless there are backdoor buried traces that bypass this (which would be hard evidence of a backdoor, since they would make *no sense*), it's safe
      Show this thread
      12:32 AM - 21 Oct 2019
      1 reply 0 retweets 0 likes
        1. doragasu‏ @doragasu 21 Oct 2019
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          Replying to @marcan42

          Oh sorry for the stupid question then.

          0 replies 0 retweets 0 likes
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