[cma-l] Singing posters and talking shirts stealing from your FM signal...

Thu Mar 9 12:26:24 GMT 2017

Yes, far away there might be no practically measurable difference, but the original field in the vicinity of the device must be modified, even if trivially – you can’t get something for nothing. 

However, even there I expect the argument would be that the original field is still insignificantly changed. (It is however in law perhaps still unauthorized use of someone else’s electricity/em field.)

Alex

From: cma-l-bounces at mailman.commedia.org.uk [mailto:cma-l-bounces at mailman.commedia.org.uk] On Behalf Of Associated Broadcast Consultants
Sent: 09 March 2017 11:56
To: The Community Media Association Discussion List <cma-l at mailman.commedia.org.uk>
Subject: Re: [cma-l] Singing posters and talking shirts stealing from your FM signal...

Alternatively you could say the original transmission IS indeed unchanged.  It is the identical signal broadcast from a big mast miles away and there is no way this system can change that.

What it's changing is the reflection environment from what I understand.  Maybe a bit analagous to sonar or radar.

But maybe I understand wrongly!

Glyn

On 9 March 2017 at 11:42, Alex Gray, Two Lochs Radio <tlr at gairloch.co.uk <mailto:tlr at gairloch.co.uk> > wrote:

Exactly Ian -    I guess he means “…without significantly affecting the original transmissions…” or perhaps he’s found some new laws of physics. 

Interesting technique though if you read the full details. Reminds me of the cunning Russian passively bugged ‘friendship’ emblem that sat in the US Embassy in Moscow for some time. Also the (apocryphal I think) tale of the farmer prosecuted for lighting his house using power tapped off the near field of the Droitwich log wave transmitter.

Alex

From: cma-l-bounces at mailman.commedia.org.uk <mailto:cma-l-bounces at mailman.commedia.org.uk>  [mailto:cma-l-bounces at mailman.commedia.org.uk <mailto:cma-l-bounces at mailman.commedia.org.uk> ] On Behalf Of Ian Hickling
Sent: 08 March 2017 22:37
To: The Community Media Association Discussion List <cma-l at mailman.commedia.org.uk <mailto:cma-l at mailman.commedia.org.uk> >
Subject: Re: [cma-l] Singing posters and talking shirts stealing from your FM signal...

".......we developed a new way of communication where we send information by reflecting ambient FM radio signals that are already in the air, which consumes close to zero power.” The UW team has — for the first time — demonstrated how to apply a technique called “backscattering” to outdoor FM radio signals. The new system transmits messages by reflecting and encoding audio and data in these signals that are ubiquitous in urban environments, without affecting the original radio transmissions......"
Oh yeah? 

Ian Hickling

Partner

  _____  

 <https://www.avast.com/antivirus> 

This email has been checked for viruses by Avast antivirus software. 
www.avast.com <https://www.avast.com/antivirus>  

_______________________________________________

Reply - cma-l at commedia.org.uk <mailto:cma-l at commedia.org.uk> 

The cma-l mailing list is a members' service provided by the Community Media Association - http://www.commedia.org.uk
Twitter: http://twitter.com/community_media
http://www.facebook.com/CommunityMediaAssociation
Canstream Internet Radio & Video: http://www.canstream.co.uk/
_______________________________________________

Mailing list guidelines: http://www.commedia.org.uk/about/cma-email-lists/email-list-guidelines/
_______________________________________________

To unsubscribe or manage your CMA-L mailing list subscription please visit:
http://mailman.commedia.org.uk/mailman/listinfo/cma-l

-- 

Glyn Roylance - Principal Consultant 

Associated Broadcast Consultants <http://www.a-bc.co.uk/> 

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.commedia.org.uk/pipermail/cma-l/attachments/20170309/c1b2924c/attachment.html>