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low frequency qrtone? #22

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monperrus opened this issue Jun 14, 2021 · 3 comments
Open

low frequency qrtone? #22

monperrus opened this issue Jun 14, 2021 · 3 comments

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@monperrus
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Hi,

We need to use qrtone outside, where low frequency messages would travel much farther away.

Would it be possible to configure qrtone to transmit over the lower range of the audible spectrum?

Thanks,

@Baudry and @monperrus

@nicolas-f
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Hi,
It's true that low frequency is less attenuated over long distance however more side effects should make difficult any communication systems (echoes, sound wave interference, air turbulence and wind). Moreover mems microphones are not sensitive below ~100 Hz
Best regards,
Nicolas

@monperrus
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Thanks for the fast answer.

more side effects should make difficult any communication systems (echoes, sound wave interference, air turbulence and wind).

Yes, and this is where the powerful error-correction code of qrtone would shine :)

Moreover mems microphones are not sensitive below ~100 Hz
Interesting, I was not aware of this.

So maybe we can have qrtone over the range 100MhZ-200MhZ.

@monperrus
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FYI, we love and use qrtone as artistic medium: https://larrymardell.bandcamp.com/track/disk

Next step on our side: qrtone underwater (hence this low frequency thread), we're applying for funding.

Thanks for all.

--Benoit and Martin

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