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I know zero about this topic. Are there dynamic audio sensors that could provide real time adaptions to the room audio profile? Something like a light meter in

by prox 6y ago

I know zero about this topic. Are there dynamic audio sensors that could provide real time adaptions to the room audio profile? Something like a light meter in photography?

mschulkind 6y ago
That's exactly what the digital room correction is that the comment you replied to mentioned, except it's not real-time, since the profile doesn't change rapidly. You push a button to run it every time you make major room changes like moving the speakers.
- prox 6y ago
  Ah gotcha. Thanks!
hwillis 6y ago
Only for the trivial cases. You could tell if the speaker is placed in a drastically bad place, ie it sounds bad everywhere, but you wouldn't be able to tell if the speaker sounds good where the listener is. For that you need to put a microphone (which itself would need to be of relatively good quality) where the listeners ears are. Even with measurements like that, it's pretty nontrivial to compensate for it. It's technically a proven problem[1] (solvable for some convex shapes) but its a little more complex than just adjusting the volume or phase of a given frequency. A room -and by extension all the little nooks and crannies of a room- acts as a resonator, and will gather and sustain notes. You need to counter that sustain ahead of time. 1: https://en.wikipedia.org/wiki/Hearing_the_shape_of_a_drum https://en.wikipedia.org/wiki/Hearing_the_shape_of_a_drum
lozaning 6y ago
oh absolutely. http://accueq.onkyousa.com/ http://accueq.onkyousa.com/
- eeZah7Ux 6y ago
  I wonder why this is not more common. It should take a (cheap) microphone with a known response curve and a sine wave generator to calibrate any number of speakers in a room.
  - drifkin 6y ago
    Most midrange A/V receivers come with mics these days to do this sort of calibration. For example, Denon's version of this is called Audyssey http://manuals.denon.com/avrx4100w/NA/EN/GFNFSYnuokgukf.php http://manuals.denon.com/avrx4100w/NA/EN/GFNFSYnuokgukf.php
  - dsr_ 6y ago
    It's quite common, actually. Yamaha, Onkyo, Denon, Marantz all have versions of it on nearly all their home-theater receivers.
buildbot 6y ago
I believe apple homepods do this - “ Direct and ambient audio beamforming Computational audio for real-time tuning”[1] [1] https://www.apple.com/homepod-2018/specs/ https://www.apple.com/homepod-2018/specs/
- johnvanommen 6y ago
  Beamforming is a way of taking an array of drivers and manipulating their phase and frequency response to direct the sound in a calculated direction. IE, you can have seven drivers in a ring, and you can direct the sound in ONE direction instead of ALL directions. Amazon Alexa does the same thing, except with an array of microphones.
  - buildbot 6y ago
    Ah, I figured that would help with this issue as well but I can see it’s a different thing now, thank you.

by prox 6y ago

I know zero about this topic. Are there dynamic audio sensors that could provide real time adaptions to the room audio profile? Something like a light meter in photography?

mschulkind 6y ago

That's exactly what the digital room correction is that the comment you replied to mentioned, except it's not real-time, since the profile doesn't change rapidly. You push a button to run it every time you make major room changes like moving the speakers.

prox 6y ago
Ah gotcha. Thanks!

hwillis 6y ago

Only for the trivial cases. You could tell if the speaker is placed in a drastically bad place, ie it sounds bad everywhere, but you wouldn't be able to tell if the speaker sounds good where the listener is. For that you need to put a microphone (which itself would need to be of relatively good quality) where the listeners ears are. Even with measurements like that, it's pretty nontrivial to compensate for it. It's technically a proven problem[1] (solvable for some convex shapes) but its a little more complex than just adjusting the volume or phase of a given frequency. A room -and by extension all the little nooks and crannies of a room- acts as a resonator, and will gather and sustain notes. You need to counter that sustain ahead of time. 1: https://en.wikipedia.org/wiki/Hearing_the_shape_of_a_drum https://en.wikipedia.org/wiki/Hearing_the_shape_of_a_drum

lozaning 6y ago

oh absolutely. http://accueq.onkyousa.com/ http://accueq.onkyousa.com/

eeZah7Ux 6y ago
I wonder why this is not more common. It should take a (cheap) microphone with a known response curve and a sine wave generator to calibrate any number of speakers in a room.
- drifkin 6y ago
  Most midrange A/V receivers come with mics these days to do this sort of calibration. For example, Denon's version of this is called Audyssey http://manuals.denon.com/avrx4100w/NA/EN/GFNFSYnuokgukf.php http://manuals.denon.com/avrx4100w/NA/EN/GFNFSYnuokgukf.php
- dsr_ 6y ago
  It's quite common, actually. Yamaha, Onkyo, Denon, Marantz all have versions of it on nearly all their home-theater receivers.

buildbot 6y ago

I believe apple homepods do this - “ Direct and ambient audio beamforming Computational audio for real-time tuning”[1] [1] https://www.apple.com/homepod-2018/specs/ https://www.apple.com/homepod-2018/specs/

johnvanommen 6y ago
Beamforming is a way of taking an array of drivers and manipulating their phase and frequency response to direct the sound in a calculated direction. IE, you can have seven drivers in a ring, and you can direct the sound in ONE direction instead of ALL directions. Amazon Alexa does the same thing, except with an array of microphones.
- buildbot 6y ago
  Ah, I figured that would help with this issue as well but I can see it’s a different thing now, thank you.