On 10/19/2010 09:29 AM, Vladimir Vassilevsky wrote:> > ... Recently I fucked up (or had a valuable > learning experience, if you put it in politically correct way).I'll try to remember that phrasing the next time I'm standing to bit of my work as it smokes throws of pieces and generally turns to slag: "my, what a valuable learning experience we're having". -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html
Interpolation by rational factor
Started by ●October 18, 2010
Reply by ●October 19, 20102010-10-19
Reply by ●October 19, 20102010-10-19
On 10/19/2010 9:47 AM, Tim Wescott wrote:> On 10/19/2010 09:29 AM, Vladimir Vassilevsky wrote: >> >> ... Recently I fucked up (or had a valuable >> learning experience, if you put it in politically correct way). > > I'll try to remember that phrasing the next time I'm standing to bit of > my work as it smokes throws of pieces and generally turns to slag: "my, > what a valuable learning experience we're having". >When the missile was being demonstrated to a gallery of military folks, the missile took off and then either augered in or blew up. The project manager said: "and, that General, is why we have testing programs"
Reply by ●October 20, 20102010-10-20
On Oct 19, 9:29�am, Vladimir Vassilevsky <nos...@nowhere.com> wrote:> Speaking of interpolation... > ... > Not very long ago Dale asked me what is the origin of the rule to > increase the stopband requirements of a filter by N times if you are > planning to decimate this filter into N subfilters. That's simple: when > the filter is decimated, its response is aliased. The N times > requirement corresponds to the worst case. It generally doesn't matter > if the filter is designed by Parks-McClellan, Windowed or any other method. > > Vladimir Vassilevsky > DSP and Mixed Signal Design Consultanthttp://www.abvolt.comI still find it curious. What I asked Vlad was why -he- was applying the factor as filter design issue. I've always had customers with systems engineers who wrote cross-talk specifications that included the appropriate factor into the system specs before they were put out for bid.It's a systems issue whether the requirement is worst case or otherwise depending on the application and it's environment. In some applications of interpolation the interference might only consist of noise and the factor would not be N in a signal to noise driven requirement Dale B. Dalrymple
