This NASA webpage says that the EDL mic wasn't able to record sound during the descent, but has been able to record sound from the surface of Mars. So the mic is functional. But why couldn't it record sound during the descent? The webpage mentions the turbulence of the entry and descent, but is rather vague on the subject.

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    $\begingroup$ Perhaps having non-essential things on during a complex operation is not a good idea? $\endgroup$
    – Jon Custer
    Sep 8 '21 at 14:51
  • $\begingroup$ @JonCuster Then why did they have an EDL mic in the first place? $\endgroup$
    – usernumber
    Sep 8 '21 at 16:11
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    $\begingroup$ Because there is less risk (and more available power) while just driving around as opposed to falling out of space. $\endgroup$
    – Jon Custer
    Sep 8 '21 at 16:27
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    $\begingroup$ @JonCuster I wonder why it was called the EDL mic if it wasn't supposed to be on during, um, EDL. $\endgroup$ Sep 9 '21 at 1:59

There's an interview with the audio engineer for the mission, Jason Achilles Mezilis, on the Naked Scientists Podcast. The system was supposed to record five and a half minutes of audio during the descent. He has a brief mention of the problem around 43:00 on the podcast. He didn't go into great detail.

By the end of the first day it was relatively known that ... that the audio was lost. It was basically a problem between the digitizer and the software. Things not talking to each other.

Technology Review has an article with a similar quote from "NASA Officials"...

The [EDL] microphone unfortunately failed to collect data properly. It does not seem to be a hardware issue, and NASA officials speculate there was a communication error between the system that converts sound from analog to digital and the onboard computer.

  • $\begingroup$ Interesting, wonder how that slipped through testing. $\endgroup$ Sep 8 '21 at 21:34
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    $\begingroup$ The podcast has some other comments. It seems to be a "last-second" edition as an external request. NASA basically telling them they could stick the microphone on as long as they did it in a way that didn't endanger the other mission goals. So it wan't really part of the project the way other instruments were. $\endgroup$
    – BowlOfRed
    Sep 8 '21 at 21:38
  • $\begingroup$ Ah, makes sense. Thanks for the additional info. $\endgroup$ Sep 8 '21 at 21:40

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