Friday, October 30, 2009

Did you know that a startup powers Gmail’s video chat feature?

?ui=2&view=att&th=124a4d6953fd7fee&attid=0.1&disp=attd&realattid=ii_124a4d6953fd7fee&zwThat's some smacking tech research company - the inheritors of the likes of Xerox and HP.

Google built a web client around Vidyo's system and launched it nearly exactly a year ago. 

Vidyo announced that it has secured a patent for the technology that underlies the telepresence service it provides Google and other customers: "System and Method for a Conference Server Architecture for Low Delay and Distributed Conferencing Applications." 

Vidyo's technology treats every participant in a conference individually so as to give each the best capable up-stream and down-stream experience at any one moment by adjusting bitrates and resolutions dynamically (Google limits its implementation to only two people, but Vidyo can accommodate many more).

Saturday, October 24, 2009

How does Shazam Identify Songs?

Shazam, launched in 2002 enables music lovers to identify tunes anywhere - using just their mobile phone. Record the song playing live and send it to Shazam

How Shazam works. 

The company has a library of more than 8 million songs, and it has devised a technique to break down each track into a simple numeric signature—a code that is unique to each track.

How does Shazam make song fingerprints? 

As Avery Wang, Shazam's chief scientist and one of its co-founders, explained to Scientific American in 2003, the company's approach was long considered computationally impractical—there was thought to be too much information in a song to compile a simple signature. But as he wrestled with the problem, Wang had a brilliant idea: What if he ignored nearly everything in a song and focused instead on just a few relatively "intense" moments? Thus Shazam creates a spectrogram for each song in its database—a graph that plots three dimensions of music: frequency vs. amplitude vs. time. The algorithm then picks out just those points that represent the peaks of the graph—notes that contain "higher energy content" than all the other notes around it, as Wang explained in an academic paper he published to describe how Shazam works (PDF). In practice, this seems to work out to aboutthree data points per second per song.

More: 

Saturday, October 3, 2009

ISRO Bhuvan?

Bhuvan, (Sanskritभुवन Hindiभुवन, lit: Earth), is a satellite mapping tool similar toGoogle Earth and Wikimapia. It was developed by Indian Space Research Organisation (ISRO). It offers resolution up to 10 metres and is considered as a rival to Google Earth and Wikimapia.[1]

A prototype (beta)[2] of this application was launched on 12th August 2009.[3]


http://en.wikipedia.org/wiki/Bhuvan


Currently Bhuvan can be viewed in Internet Explorer 6.0 or above, Mozilla Firefox 3.5.1 or above, Netscape 6.0 or above on Windows platform. Bhuvan Plug-in should be installed after the browser installation

http://bhuvan.nrsc.gov.in/

Here are some pictures of ISRO Bhuvan Software and Website.

ISRO Bhuvan in Action


Friday, October 2, 2009

A brief history of PayPal

A University of Illinois graduate moved to Silicon Valley with a great goal (perhaps inspired by the Illini commencement address) – develop security software for hot-selling handheld devices like the Palm Pilot. He assumed that enterprises were soon going to be using Palms as primary means of communication and sharing documents, and would need security to protect business secrets. "Any minute now, there'll be millions of people begging for security on their handheld devices," he thought. He was wrong – he never found a demand for handheld security software.

He could have kept trying to make his original idea work. Entrepreneurs that do stick to fixed goals are very good at least at one thing – wasting investors' money. An idea for an online grocery startup, Webvan, managed to go through $1 billion before finally pulling the plug.

Illinois Man was different. He shifted to Plan B. Sell his cryptography software. Still no takers. We can skip over Plans C, D, and E, which all failed.

Plan F was a system for securely transferring cash from one Palm Pilot to another. He put a demo on the Internet so people could see how great it would be for Palm Pilots. People liked the web demo and started using it for real transactions, while the demand from Palm users still failed to materialize. eBay users started asking if they could put the web demo in their ads for people to pay them. There was no demand for the product, only for the web demo.

Illinois Man finally realized what might succeed. He forgot about Palm Pilots. Plan G was a system for making secure online payments for sites like eBay. His Plan G company was called PayPal, and his name was Max Levchin. eBay eventually bought PayPal for $1.5 billion. The story is from a new book by John Mullins and Randy Komisar, Getting to Plan B.

Source: http://blogs.nyu.edu/fas/dri/aidwatch/2009/10/set_a_big_goal_give_everything.html

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