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From: Gregory Maxwell <greg@xiph.org>
Date: Wed, 10 Aug 2016 02:14:42 +0000
Message-ID: <CAAS2fgR-weACn_Ezg8-uZuSH0QT5dfLEFE5WO2VDi0nx8H1e9g@mail.gmail.com>
To: Daniel Hoffman <danielhoffman699@gmail.com>, 
	Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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Subject: Re: [bitcoin-dev] BIP Number Request: Addresses over Audio
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On Tue, Aug 9, 2016 at 11:06 PM, Daniel Hoffman via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> I have updated the GitHub a lot (changed tones to be less chirpy, fixed
> some smalls) and made a couple of samples (see attachment for MP3 and FLAC
> of both tone tables, first 16 then 4). Is this good enough to warrant an
> official BIP number? I haven't built a decoder yet, but it seems like the
> encoder is working properly (looked at Audacity, seems like it is working),
> and some people on reddit want to "allow for decoding experiments"
> <https://www.reddit.com/r/btc/comments/4wsn7v/bip_proposal_addresses_over_audio_thoughts/d69m3st>
>
> What suggestions do you all have for it?
>


With DSP hat on, your decoder for noisy/distorted channels will be 99.9% of
the complexity and will completely control the design of the encoder.

It's not a proposal yet without a decoder, it's just an idea.  FSK modems
microphone-channel (terrible multipath) is quite challenging and several
other parties have tried to do bitcoin info over audio in the past without
success.

It's very interesting, but I think you do need to go through and get the
whole thing working to really gauge viability.

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<div dir=3D"ltr">On Tue, Aug 9, 2016 at 11:06 PM, Daniel Hoffman via bitcoi=
n-dev <span dir=3D"ltr">&lt;<a href=3D"mailto:bitcoin-dev@lists.linuxfounda=
tion.org" target=3D"_blank">bitcoin-dev@lists.linuxfoundation.org</a>&gt;</=
span> wrote:<br><div class=3D"gmail_extra"><div class=3D"gmail_quote"><bloc=
kquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #cc=
c solid;padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_extra">I hav=
e updated the GitHub a lot (changed tones to be less chirpy, fixed some sma=
lls) and made a couple of samples (see attachment for MP3 and FLAC of both =
tone tables, first 16 then 4). Is this good enough to warrant an official B=
IP number? I haven&#39;t built a decoder yet, but it seems like the encoder=
 is working properly (looked at Audacity, seems like it is working), and so=
me people on reddit want to <a href=3D"https://www.reddit.com/r/btc/comment=
s/4wsn7v/bip_proposal_addresses_over_audio_thoughts/d69m3st" target=3D"_bla=
nk">&quot;allow for decoding experiments&quot;</a></div><div class=3D"gmail=
_extra"><br></div><div class=3D"gmail_extra">What suggestions do you all ha=
ve for it?</div></div></blockquote><div><br><br></div><div>With DSP hat on,=
 your decoder for noisy/distorted channels will be 99.9% of the complexity =
and will completely control the design of the encoder.<br><br></div><div>It=
&#39;s not a proposal yet without a decoder, it&#39;s just an idea.=C2=A0 F=
SK modems microphone-channel (terrible multipath) is quite challenging and =
several other parties have tried to do bitcoin info over audio in the past =
without success. <br><br></div><div>It&#39;s very interesting, but I think =
you do need to go through and get the whole thing working to really gauge v=
iability.<br></div></div></div></div>

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