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Thursday, May 24, 2007

Bluetooth

La tecnología inalámbrica Bluetooth es un sistema de comunicaciones de corto alcance, cuyo objetivo es eliminar los cables en las conexiones entre dispositivos electrónicos, tanto portátiles como fijos, manteniendo altos niveles de seguridad. Las características principales de esta tecnología son su fiabilidad, bajo consumo y mínimo coste. La especificación Bluetooth establece una organización uniforme para que un amplio abanico de dispositivos pueda conectarse y comunicarse entre sí.

Gracias a su gran aceptación, un dispositivo Bluetooth puede conectarse con casi cualquier otro dispositivo compatible que se halle en las proximidades, eliminando las fronteras en cualquier parte del mundo. Los dispositivos electrónicos equipados con tecnología Bluetooth pueden conectarse y comunicarse de forma inalámbrica mediante redes ad hoc de corto alcance denominadas piconets. Cada dispositivo puede conectarse simultáneamente con hasta otros siete dentro de una misma piconet. Un dispositivo puede pertenecer a varias piconets al mismo tiempo. Las piconets se establecen de forma dinámica y automática cuando los dispositivos Bluetooth se encuentran en el mismo radio de acción.

Una de las principales ventajas de la tecnología inalámbrica Bluetooth es su capacidad para gestionar simultáneamente tanto transmisiones de voz como de datos. Esto permite a los usuarios disfrutar de una gran variedad de soluciones innovadoras, tales como el uso de manos libres para atender llamadas, funciones de impresión y fax, o la sincronización de aplicaciones entre PDA, ordenadores y móviles, entre otras muchas.

Versión de la especificación principal

Versión 2.0 y especificación EDR (transferencia de datos mejorada), adoptada en noviembre de 2004.
Versión 1.2, adoptada en noviembre de 2003.
Composición de las especificaciones
A diferencia de otros estándares inalámbricos, la especificación Bluetooth otorga a las empresas de desarrollo definiciones para la capa de enlace y de aplicaciones, lo que permite que sea compatible con soluciones de voz y datos.

Espectro
La tecnología Bluetooth opera en una banda de frecuencia industrial, científica y médica (ISM) que no requiere licencia y que se encuadra, concretamente, entre 2.4 y 2.485 GHz. Utiliza una señal bidireccional en un espectro ensanchado por salto de frecuencia a una velocidad nominal de 1600 saltos/segundo. La banda ISM de 2.4 GHz está disponible en casi todos los países y no suele requerir licencia.

Interferencias
La función de salto adaptable de frecuencia (AFH) de la tecnología inalámbrica Bluetooth se diseñó expresamente para reducir las interferencias de las tecnologías inalámbricas que comparten el espectro de 2.4 GHz. La función AFH utiliza la frecuencia disponible dentro del espectro. Para ello, detecta los dispositivos conectados y descarta las frecuencias que éstos estén utilizando. Este salto adaptable permite unas transmisiones más eficaces dentro del espectro, por lo que se mejora el funcionamiento del dispositivo, incluso si el usuario utiliza otras tecnologías al mismo tiempo. La señal salta entre 79 frecuencias en intervalos de 1 MHz para tener un alto grado de tolerancia a las interferencias.

Alcance
El alcance depende de la clase del dispositivo:

Los radios de clase 3 suelen tener un alcance de entre uno y tres metros.
Las radios de clase 2 son habituales de los dispositivos portátiles y tienen un alcance de diez metros.
Las radios de clase 1 se utilizan principalmente en el sector industrial y logran un alcance de cien metros.
Potencia
Las radios más utilizadas son las de clase 2, con una potencia de 2,5 mW. La tecnología Bluetooth se ha diseñado para minimizar el consumo de energía. Para ello, la especificación cambia las radios al modo de ahorro de energía cuando no están activas.

Velocidad de transmisión
1 Mbps en la versión 1.2 y hasta 3 Mbps en la versión 2.0 y EDR

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Wednesday, May 16, 2007

iPhone may boost high-end mobile demand

Nokia is looking at Apple's market entrance as "opportunity."

Posted by Reuters and Simon Aughton at 9:49AM, Tuesday 15th May 2007

Finnish mobile giant Nokia is optimistic that Apple's highly anticipated iPhone will boost consumer appetite for pricier mobile phones with features such as music and video.
Smartphones that let users to surf the web, take photos, listen to music, watch video and sometimes play games games - in addition to making calls - are often priced above $400, before subsidies by mobile carriers, but Nokia's chief financial officer Rick Simonson is hoping that Apple's market entrance may help stimulate more spending.
"The consumer hasn't had a lot of choice to go out and purchase these kind of higher-end, feature-rich multimedia devices," Simonson said at the Reuters Global Technology, Media and Telecoms Summit.
"If that can help that market grow, I think that gives us an opportunity."
The iPhone is Apple's biggest foray yet into the cut-throat $145 billion consumer electronics industry. Chief executive Steve Jobs has set a goal of selling one million units in calendar 2008.
"Don't get me wrong, they will bring some things to the table that we have to be responsive to, but we have been investing in this area or some time," Simonson said.
"We are leading in multimedia convergence."
Simonson said Nokia, the world's biggest maker of mobile phones, already makes best-selling multimedia handsets - including the N73 and the N95 - that will challenge iPhone when Apple's device debuts in the US in June.
"[The N95] is already out there, doing many of the things that people are talking about the iPhone doing. The iPhone is interesting. It's very much a validation of what we've been doing, in terms of saying there is a multimedia device out there that people will pay for," he said.
Apple has said it could eventually sell 10 million iPhones, a unique combination of touch-screen iPod with video, internet communicator. The version with 4GB of flash memory will cost $499, while the 8GB version will cost $599.
Apple expects to launch it in Europe before the end of the year.

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Wednesday, May 09, 2007

Bluetooth

Bluetooth Headsets: Give Your Ears the Best

Yesterday we looked at a laundry list of stuff you should be thinking about before buying a Bluetooth headset. Price and comfort, boom microphones, noise cancellation algorithms, easy pairing with your devices, and Bluetooth 2.1 compatibility should all figure heavily on the score sheet. Now that you know the score, it's time to delve into what's out there that's new, hot, and just plain useful.

BlueAnt V12 LCD Bluetooth Headset

The big "aha" on this headset is its built-in display that can hold 10 contact names and has 12-number caller ID and voice dial. Of course the down side of having an LCD on your Bluetooth headset is that you really can't read anything on it while it's parked in your ear. (If you must, the headset includes a lanyard so you can wear it around your neck and view caller ID.) Perhaps the best part of the LCD is that there's a battery usage indicator.

Sound ID SM100

The most expensive, and clearly one of the most advanced, earbuds I've seen, but it may be worth it for those with hearing loss. It's got a sleek design and weighs next to nothing. The device shines with its unique noise cancellation capabilities. The three personalized sound levels—normal, moderate, and strong—clean up and enhance the sound without you ever needing to touch the volume control. The earpiece comes with tips for various sized ears and multiple earloops that make it easy to create a personalized fit. And, when you're not talking on the phone, the SM100 uses an environmental microphone to take in the sounds around you so your normal hearing is not affected by wearing the earpiece. Battery life seems a bit short and the price is way high. Recommended for those who need a hearing boost.

Aliph Jawbone

This lovely headset from Aliph is one of the prettiest earpieces on the market, but it also gets some of the highest marks when it comes to noise reduction (it adjusts the call volume based on ambient noise in the environment and also filters out noise) and can be worn by glasses wearers. The Jawbone name comes from the fact that it picks up your voice through movement of your jaw, not just through a microphone, which helps you sound crisp and clear. The design looks metallic (aka cold) but is really medical-grade, very lightweight plastic. A soft rubber button sits against your jawbone, sensing vibrations as you speak. About $129.

Jabra JX10

Jabra from GN is one of the top selling Bluetooth headsets. Known for its unique, almost Trekkian design that wraps around your ear with an ear hook, Jabra brought style into the ugly world of earpieces. The one I like best is the JX10. You charge it in a cradle—much more civilized than plugging it into the power supply. It weighs less than three ounces and costs $179.

Motorola H680 Bluetooth Headset

Motorola's H680 headset was just introduced at a recent trade show. It wins for longest battery life: Motorola claims eight hours of talk or eight days of standby. The H680 weighs in at less than an ounce!

Pulsar 260 Stereo Bluetooth Headset

Enough of these monaural earpieces! Plantronics Pulsar has two corded earpieces much like a regular set of earbuds. It's designed for the growing number of folks who want to switch between listening to music and taking their calls. The Bluetooth controls your phone/music player and you wear a pendant around your neck to switch between calls and music and control volume and song selection. It sells for about $55.

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