There's a revolution coming in broadcast television, and for those not yet equipped to handle the change, solutions are standing by. The long-discussed Federal Communications Commission (FCC) mandate to switch off analog television signal transmission across the country is now slated for Feb. 17, 2009. Digital TV broadcasting will replace remaining analog signals, a move already begun or implemented in many U.S. markets. People who use cable or satellite TV, regardless of their televisions' functionality, will not be affected by the conversion; those with antenna-based TVs that have only analog tuners, however, have been bracing themselves for the inevitable kick of their old TVs to the curb.
Not so fast. Technology comes to the rescue, in the form of a converter box that massages DTV signals back to the analog format needed for legacy television compatibility. Converter boxes from a variety of manufacturers have made their way to consumer electronics store shelves in recent months to help ease customers through the pending DTV changeover. Because the analog signal "go-dark" order was imposed by the FCC, there's even an offer for U.S. government help: To defray the cost of spectral repurposing, consumers can apply for $40 coupons from the Department of Commerce to be used toward the purchase of an approved DTV converter box.
A few years ago, I was working on the design of a data acquisition system (DAS) that would eventually need to be tested when manufactured. It had both high-side current sensing and floating diff-amp input channels. I could either recommend to the client that some expensive equipment be bought and configured for such testing or else design and build some prototypes of a Floating Differential Source (FDS) which would cost much less. I did the latter.
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. Letís see if I understand this. (Here Iím channeling you, the puzzled reader, after youíve 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 isÖ the ratio of the amplitude of the fundamental to the amplitude of the fundamental and thatísÖ unity. I. Do. Not. Understand.