NEW YORK—The Defense Advanced Research Projects Agency is exploring unconventional processing methods to analyze mission-critical intelligence, surveillance and reconnaissance (ISR) data in the analog realm.
The agency has launched a program called UPSIDE, which stands for the Unconventional Processing of Signals for Intelligent Data Exploitation. Darpa’s motivation is to find processing techniques that do not have the same power and speed limitations associated with digital processors used in today’s ISR platforms.
The program employs probabilistic inference as its fundamental computational model to drive down power consumption. Inference can be implemented directly in approximate precision by traditional semiconductors as well as by new kinds of emerging devices. This approach aims to compute inference directly and more naturally through a number of interconnected analog nodes.
“A single inference operation performed in digital CMOS could involve hundreds of operations. However, the inference operation can be more naturally performed directly by a group of coupled analog devices, reducing both power and the number of discrete operations,” said Darpa program manager Dan Hammerstrom. “Utilizing coupled analog devices to represent data in a non-Boolean form for high-order computation is expected to provide orders of magnitude improvements in the power efficiency of data processing.”
According to an agency announcement, the definition of emerging devices is broad to allow developers to propose a wide range of parts. But they cannot be CMOS-based, at least not without additional specialized processing steps, and cannot be on the mainstream ITRS http://www.itrs.net/about.html roadmap. Analog-based devices such as memristors and spin torque oscillators could possibly be used to replace CMOS-based digital processors to accelerate video and imagery analysis in ISR systems, according to Hammerstrom.
As an engineer, eventually you will have to insert an equation into your written work or presentation. This can be a struggle as equation editors are not always the friendliest. However, there is good news. The equation editor in Word has improved immensely (I am using version 2010 here). In this blog we look at how to insert an equation into a Word document. As a bonus, there is information on how to insert an equation into a web page with an html code generator website.
Wait a minute. Let’s see if I understand this. (Here I’m channeling you, the puzzled reader, after you’ve grabbed me in the coffee break of a Filter Wizard lecture morning). The frequency of the nth harmonic of a sinusoid is n times that of the fundamental. The nth harmonic distortion is defined as the ratio of the amplitude of the nth harmonic to the amplitude of the fundamental. So the 1st harmonic distortion is… the ratio of the amplitude of the fundamental to the amplitude of the fundamental and that’s… unity. I. Do. Not. Understand.
Single-ended signals are very common, but increasingly signal paths are being converted to differential signals as part of the signal chain. The benefits of differential signaling are particularly appealing with low supply voltage systems and for driving analog-to-digital converters (ADCs).
If you spend any time at all looking at alternative energy sources such as wind power and solar energy, you'll quickly discover one inconvenient truth: alternative energy production is both highly unpredictable and uncorrelated to energy demand.