Wow. No value judgement, but 1980 called, they want their radio broadcast for analogue modems back. Both very cool and very cringe worthy.

It sounds quite horrible tbh. Imagine this being as pervasive as bar and qr codes. And it's as meaningful and unpleasant to the human ear as a qr code is to the eye.

Please think of something like using a Mozart symphony as the carrier wave onto which you modulate your signal. Let the notes last a little longer to represent a 1 bit. Or change the tempo. Or add an echo. Make it so the listener can interpret it as a generic not too annoying tune and not even realise it's different every time without being an audiophile.

Maybe have a 100 different base tunes from mozart to hiphop so the user can pick one suitable to their audience and context. Maybe have some that don't interfere with human speech frequencies so narrator can keep talking right over it.

I guess it may be tricky because you want your signal to survive re-encoding as increased playback speeds.

Another consideration: you want a preamble that is very easy to detect, so it doesn't cost a lot of CPU (battery) to have your podcast player continuously scanning for these things.

Not sure all these wishes are possible at the same time, but surely there's research around on some?.


On 10 Aug 2016 1:28 a.m., "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"

What suggestions do you all have for it?

On Mon, Aug 8, 2016 at 8:50 PM, Daniel Hoffman <danielhoffman699@gmail.com> wrote:
It wouldn't be feasible in the vast majority of cases, but I can't think of a reason why it can't be built into the standard.

On Mon, Aug 8, 2016 at 5:59 PM, Trevin Hofmann via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:

Would it be feasible to transmit an entire BIP21 URI as audio? If you were to encode any extra information (such as amount), it would be useful to include a checksum for the entire message. This checksum could possibly be used instead of the checksum in the address.

Trevin


On Aug 8, 2016 3:06 PM, "Justin Newton via bitcoin-dev" <bitcoin-dev@lists.linuxfoundation.org> wrote:
Daniel,
   Thanks for proposing this.  I think this could have some useful use cases as you state.  I was wondering what you would think to adding some additional tones to optionally denote an amount (in satoshis?).

(FYI, actual link is here:  https://github.com/Dako300/BIP )

Justin

On Mon, Aug 8, 2016 at 2:22 PM, Daniel Hoffman via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:
This is my BIP idea: a fast, robust, and standardized for representing Bitcoin addresses over audio. It takes the binary representation of the Bitcoin address (little endian), chops that up into 4 or 2 bit chunks (depending on type, 2 bit only for low quality audio like american telephone lines), and generates a tone based upon that value. This started because I wanted an easy way to donate to podcasts that I listen to, and having a Shazam-esque app (or a media player with this capability) that gives me an address automatically would be wonderful for both the consumer and producer. Comes with error correction built into the protocol

You can see the full specification of the BIP on my GitHub page (https://github.com/Dako300/BIP-0153).

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Justin W. Newton
Founder/CEO
Netki, Inc.




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