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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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    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).

    7:39 PM - 20 Oct 2019
    • 29 Retweets
    • 187 Likes
    • Caty Carlo Mara klizz 7heo Jon Gjengset Reinier signal eleven acid Eero Vuojolahti
    8 replies 29 retweets 187 likes
      1. New conversation
      2. Hector Martin‏ @marcan42 20 Oct 2019
        • Report Tweet
        • Report NetzDG Violation

        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
        Show this thread
      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
        Show this thread
      4. Hector Martin‏ @marcan42 20 Oct 2019
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        • Report NetzDG Violation

        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

        4 replies 1 retweet 32 likes
        Show this thread
      5. Hector Martin‏ @marcan42 20 Oct 2019
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        (correction, I meant PDM mics, not TDM; TDM is a different style, though PDM mics do time-division-multiplex the stereo channels, which is how I mixed it up)

        0 replies 1 retweet 9 likes
        Show this thread
      6. End of conversation
      1. This Tweet is unavailable.
      2. Shawn Willden‏ @shawnwillden 21 Oct 2019
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        • Report NetzDG Violation
        Replying to @Sneakyness @marcan42

        They can link to the tweet. A tweet from a random individual is weak evidence, but it trumps no evidence.

        0 replies 0 retweets 0 likes
      3. Show replies
      1. New conversation
      2. Adam Higerd‏ @codahighland 20 Oct 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @marcan42

        Seems that... shall we say, incompletely-educated people... think that the "the mic's off" message and the orange lights indicate it's a software switch, since it's obvious that there's a difference in software behavior. The idea that SW responds to HW state seems to elude them.

        1 reply 0 retweets 6 likes
      3. Bornach‏ @Bornach1 21 Oct 2019
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        Replying to @codahighland @marcan42

        I do that thing in the movies where you turn on the faucets in the kitchen or bathroom but somehow Google's multidirectional mics can still isolate my voice. Only positioning it directly under the running water seems to stop it from hearing me. Don't credit me when sharing this

        0 replies 0 retweets 1 like
      4. End of conversation
      1. New conversation
      2. Adam [he/him]‏ @adammw 20 Oct 2019
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        Replying to @marcan42

        Is this the Mini v1 or the newly announced one? I wonder if anything changed...

        1 reply 0 retweets 1 like
      3. Hector Martin‏ @marcan42 20 Oct 2019
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        Replying to @adammw

        v1

        0 replies 0 retweets 1 like
      4. End of conversation

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