January 10, 2003 (Computerworld) -- Microsoft Corp. eventually intends to build a global network to support the smart watches -- as well as other devices based on its Smart Personal Objects Technology (SPOT) -- introduced yesterday at the Consumer Electronics Show in Las Vegas (see story).
Microsoft has already put together a network of more than 100 FM radio stations in the U.S. to broadcast precise time information and personalized data to the watches over an FM subcarrier it calls DirectBand.
According to Matt Penry, line manager for the custom silicon solution group at National Semiconductor Corp., which developed the tiny (1.3 by 1.1 by 0.08 in.) seven-chip SPOT circuitry for Microsoft, the FM tuner circuit is designed to cover a frequency range of 85 to 110 MHz, or well above and below the U.S. broadcast band. That band covers 87.5 to 108 MHz.
Bill Mitchell, general manager of the Microsoft Personal Object Group, said this frequency range will allow SPOT devices to operate in countries such as Japan, where the FM broadcast band runs between 76 and 92 MHz. Mitchell said Microsoft has conducted focus groups overseas on the SPOT technology and got strong, positive reactions in France. But, Mitchell said, Microsoft will focus on English-speaking countries, including Singapore, when it first takes the SPOT network global.
Alan Reiter, an analyst at Wireless Internet & Mobile Computing in Chevy Chase, Md., questioned Microsoft's use of an FM subcarrier network to support SPOT, calling it an "old and slow" technology tried and then abandoned by the paging industry. (A subcarrier is a separate signal modulated along with the audio carrier and then decoded by a special receiver.)
Mitchell said the Microsoft Smart Personal Objects Group explored a variety of wireless networks to support SPOT before settling on the FM stations because of their breadth of coverage and relatively high throughput of 12K bit/sec. Microsoft will use two FM stations in each of the top 100 U.S. markets, as well as in 14 Canadian cities, to broadcast the personalized data to the watches. The devices will be produced by companies such as Citizen Watch Co. and Fossil Inc. and will go on sale this fall for roughly $150.
Users can sign up to receive personalized information -- such as sports scores or weather or traffic information -- which will be broadcast over the FM subcarrier data stream. National Semiconductor has built a personalized reception code into its circuitry, which will allow individual SPOT devices to pluck the personalized information out of the broadcast frames.
To feed data to the FM stations, Microsoft has built a network that includes satellite systems and wide-area networks operated by its radio station partners. This network will feed the personalized data as well as reference clock information to the FM transmitters, Mitchell said.
Although a number of companies already make clocks and watches that can tune into the highly accurate atomic clock signal broadcast by the National Institute of Standards and Technology from its WWVB radio station in Boulder, Colo., Microsoft chose to broadcast this reference signal over the FM subcarrier network, saving it from adding another receiver chip to already complex circuitry, Mitchell said.
Watches are just the first SPOT devices to hit the market, he said. He predicted that a price of $20 would make it possible to develop a variety of special-purpose devices, including a smart pillbox that would sound an alarm when it was time to take a pill and a department store loyalty token.
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