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Graham Perrin

DevHawk - The Last Mile of the Internet - 5 views

devhawk.net/...Last+Mile+Of+The+Internet.aspx

2009 2009-11 2009-11-01 PubSubHubbub

shared by Graham Perrin on 03 Nov 09 - Cached
  • August 27, 2009
  • The Last Mile of the Internet
  • NAT/Firewall issue makes any async messaging based approach useless for clients
  • ...9 more annotations...
  • Polling sucks. We think a decentralized pubsub layer is a fundamental, missing layer in the Internet architecture today
  • a fundamental design that looks like this: This picture leaves out multiple publishers and subscribers and the subscriber registration process, but you get the basic idea
  • fine for server subscribers (like, say Google Reader) but not for client subscribers (like, say TweetDeck).
  • the only way to enable client subscribers to play in this async messaging world is via some type of relay service
  • In this approach, the client subscriber makes an outbound connection to some type of relay infrastructure
  • technically feasible
  • Yes, having to relay messages sucks. But the question is
  • which sucks worse: polling or relaying?
  • Harry Pierson
ionela

An Introduction to ADC and DAC - 0 views

dev.emcelettronica.com/introduction-to-adc-and-dac

binary weighted adc dac R2R ladder

shared by ionela on 11 May 09 - Cached
  • ionela on 11 May 09
     
    The natural state of audio and video signals is analog. When digital technology was not yet around, they are recorded or played back in analog devices like vinyl discs and cassette tapes. The storage capacity of these devices is limited and doing multiple runs of re-recording and editing produced poor signal quality. Developments in digital technology like the CD, DVD, Blu-ray, flash devices and other memory devices addressed these problems.
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