Friday, September 24, 2010
Saturday, September 11, 2010
USB speakers set to get more out of laptops
Soon, music aficionados can use plug-in USB speakers that produce high-quality sound from the laptop without the need for mains power.The tinny fizz produced by most laptops’ built-in speakers spoils the music quality because the USB port, from which they get their power, can supply only 2.5 watts. Now, the British firm NXT of Cambourne, Cambridgeshire, has come up with a USB-powered system that can deliver up to 15 watts to each speaker, reports New Scientist.Although power from mains-powered units is held at around 32 volts, a USB 2.0 port can deliver no more than 5.25 volts to a device.NXT chief executive James Lewis says that most of the time music is quiet enough to be reproduced satisfactorily by circuits running at just 1 volt. So NXT built its USB-powered amplifier to run at low voltage, but able to deliver higher voltages - and more power to the speakers.This is done by tapping a pair of capacitors that store spare power from the USB during quiet passages. By pre-determining the music signal a couple of milliseconds ahead of the amplifier, the system determines exactly when to raise the voltage and unleash the stored power.“It’s the first time I’ve heard of using the dynamic reallocation of power for this type of application. It seems like a great idea,” said Andy Dowell, a director of Dolby Laboratories in the U.K. “People would love to get more oomph out of the PC speakers.”
Friday, June 4, 2010
Tuesday, August 18, 2009
New organic nano-wires may help replace silicon in computer chips
Organic nano-scale wires may serve as an alternative to silicon in computer chips, according to a collaborative team of Chinese and Danish researchers.
Nanochemists from the
The researchers say that they have crossed the wires like Mikado sticks in the contact, and coupled several contacts together in an electric circuit.
They say that doing so has enabled them to produce prototype computer electronics on the nanoscale.
Presently, the foundation of our computers, mobile phones and other electronic apparatus is silicon transistors.
A transistor is in principal an on- and off- contact, and there are millions of tiny transistors on every computer chip.
Thomas Bjornholm, Director of the
The researchers have revealed that the material developed by them has a low operational current, high mobility and good stability, the qualities that can enable it to compete with silicon.
Excited over the results, Professor Wenping Hu, of
A research article describing the study has been published in the journal Advanced Materials.
Friday, July 10, 2009
The new slogan ROTI KAPADA, MAKAAN AND MOBILE is appropriate to modern man.