![]() (8), that ratio of sin() terms can be approximated by a sin( x)/ x function. The D-point moving-average filter's time-domain output is expressed as There we see that D–1 summations (plus one multiply by 1/ D) are necessary to compute the averager's y( n) output sequence.įigure 2: D -point moving-average and recursive running sum filters. Recall the standard D-point moving-average process in Figure 2(a). With that said, let's see how CIC filters operate.ĬIC filters originate from the notion of a recursive running sum filter, which is itself an efficient form of a nonrecursive moving averager. * Narrowband lowpass filtering can be attained at a greatly reduced computational complexity compared to using a single lowpass FIR filter. And this property is why CIC filters are so attractive in decimating and interpolating DSP systems. The arithmetic needed to implement CIC filters is strictly additions and subtractions only. * CIC filters are popular in hardware devices they need no filter coefficient data storage and require no multiplications. * The FIR filters operate at reduced clock rates minimizing power consumption in high-speed hardware applications The Figure 1 cascaded-filter architectures have valuable benefits. Both applications are associated with very high-data rate filtering such as hardware quadrature modulation and demodulation in modern wireless systems, and delta-sigma A/D and D/A converters.įigure 1: CIC filter applications: (a) for decimation (b) for interpolation.īecause their frequency magnitude responses are sin( x)/ x-like, CIC filters are typically followed, or preceded, by linear-phase lowpass tapped-delay line finite impulse response (FIR) filters whose tasks are to compensate for the CIC filter's non-flat passband. The same goes to CPU or RAM Usage Meters.This article is available in PDF format for easy printingĪfter describing a few applications of CIC filters, this blog introduces their structure and behavior, presents the frequency-domain performance of CIC filters, and discusses several important practical issues in implementing these filters.ĬIC filters are well-suited for anti-aliasing filtering prior to decimation (sample rate reduction), as shown in Figure 1(a) and for anti-imaging filtering for interpolated signals (sample rate increase) as in Figure 1(b). a live Internet Traffic Indicator right on your desktop to see whenever you are downloading or uploading something and haw fast it is. drop a Text Snippet from a Website you are reading right now to reuse it later anywhere else, or drag an Image from a Website to use it later, and while Drop Circles works flawlessly in Full Screen Applications, you can even use the Center Drop for Drag & Drop actions across multiple Fullscreen Applications.Īnd with some of the Utilities you can get e.g. The Center Drop Area can be used to drop anything into it for later reuse, e.g. You can eben customise the Activator with Themes, rearrange the Circle Order, toggle between Circle Sets by Tab or Modifier Keys or just with your Scroll Wheel. Or if you set a Circle as a Copy / Move Action, you can simply click it once to get right to the destination without the need of browsing your Hard-drive the usual way.ĭrop Circles waits for your Action to activate it by touching the Display left or right Edge to appear. Simply configure your Circles to either launch an Application by clicking on it or drop any valid Item onto it to open it with this Application e.g.:ĭrag an Image to open it with this Application or drop a Link to open it with this Browser. Act as a Browser Picker (read Details further below)Īdditionally you have 4 more circles that are Utilities: (read more about them further below) Ĝopy Item to… (can be used as short-cut to the Location) Move this Item to… (can be used as short-cut to the Location) Open with … (Or use it as an Application launcher) You can setup up to 8 customisable Circles to perform this Actions: You can imagine it as an “Open with…” Extension. Drop Circles is meant to be a helpful Utility to quickly open explicit Application, either as an Application Launcher or as arg & Drop Destination.
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