Application Dennys: Fill & Download for Free

Great illustration of the pitfalls of digital signal processing in Jacob VanWagoner's answer.What he mentioned, and which I would like to emphasize, is that neither quantization error nor aliasing are necessarily fatal flaws in a properly-designed DSP system. Indeed, there are other features of DSP that make it so compelling that it's completely replaced ASP for many applications. (Dennis Ferguson mentioned several of these.)High-sampling-rate pulse-density modulation is a mind-blowing, counterintuitive technique that can be used to recover an analog signal almost perfectly, despite the fact that the digital version of the signal looks like a gross distortion of the analog original.I made this illustration (https://en.wikipedia.org/wiki/Pulse-density_modulation#mediaviewer/File:Pulse_density_modulation.svg) of PDM for Wikipedia (I also made the aliasing illustration in Jacob VanWagoner's answer):As you can see, the PDM representation of the sine wave has a humongous quantization error: it's essentially unrecognizable as a sine wave.Despite this, it's very easy to reproduce the original analog sine wave almost perfectly from the PDM version, assuming the usual Nyquist sampling criteria are satisfied. A low-pass filter circuit, which can be as simple as a resistor and a capacitor with RC=2*pi/Fmax, will do the trick: apply the PDM sample at Vin, and you'll get the original analog sine wave back out at Vout:

Foursquare and Yelp are really two very different applications designed from the beginning for two very different uses, and have tried to come back to meet in the middle for a variety of reasons, including financial and market share. Both applications have had massive changes over the last several years, searching for the right formula to take them to their companies to the respective next levels. If you want to checkin in, Foursquare’s Swarm Application is by far the best checkin solution, and most comprehensive. Yelp hasn’t figured out how to satisfy those who checkin for posterity, history, travel log, etc… It just hasn’t really moved past the review product they originally started with as evidenced below. Though, Yelp has a more comprehensive review system, with a numbered review mechanism, as opposed to Foursquare’s question based review solution. If you want to check in, Swarm/Foursquare is the app I use, and if you want to review, I have a number of options from Google Maps, TripAdvisor, Yelp, and finally Foursquare.Yelp was originally created as a review application. Check in was compulsory, but not gamified. You checked into a particular restaurant and then you reviewed the restaurant, and your reviews were the centerpiece of the application. Currently they still are not making checkin’s the centerpiece of their application as evidenced by their current UI profile. See below.Foursquare’s original purpose was a checkin, or a location’s game, where users checked in for badges, for mayorships, for number of checkins. There were pictures, and tips available, and you could review but these were secondary to the checkin game.Yelp’s original purpose was to allow users to review places they had been to, and to give a voice to users that hadn’t really been given before, and these voices had consequences. Unlike, the past where people could review; users, and business owners really took notice, and Yelp’s reputation took off. It’s reputation did take a hit, when it came to light that Yelp, may or may not have been, allowing paid users to “fix” reviews. Think Yelp is Unbiased? Think Again!! - Forbes 2012. Yelp’s reputation did take a hit.Yelp went public in 2012, and currently their stock is $6.00 above their IPO price currently. They were in need of new products and services to boost revenue and stock prices. Yelp’s checkin game started in 2010, but never really took off. Though, it continues to push it. Yelp ended up buying Eat24 in 2015 to boost revenue, and expand it’s platform. Yelp still hasn’t figured out that checking is not only fun, but it is a history, and log of where you have been. It is also fun to see where you stack up against other people also checking in.Foursquare’s application after the tectonic shift it took by splitting Foursquare into to applications, Foursquare and Swarm, has stalled a bit. Foursquare’s then CEO Dennis Crowley, was not able to fix the issues that the split created, and unlike Netflix’s CEO, Reed Hastings, who tried to split Netflix into the CD Mail order and online streaming and realized it was a huge mistake, and was able to crawfish back to merging both applications, Dennis Crowley decided to keep them separate. Foursquare lost a large portion of their loyal membership who had spent years posting photos, checkins, tips, and other content. Now their information was spread over two applications, and the use of either now seemed inconvenient, and superfluous. I too nearly stopped using he app but decided I would continue checking in on Swarm. At this time, I rarely use Foursquare.Today, Foursquare’s main application competes with Yelp, Trip Advisor, and Google maps in that it provides information about the location, pictures, reviews, and tips. If you want to checkin on Foursquare, you are sent to the Swarm Application. If you want to Checkin on Yelp or Google, it is the same application. Yelp’s checkin feature still doesn’t get it, people want to see their checkin’s, their numbers, and how they stack up to other people.Foursquare application profile UI:Swarm lacks the reviews, and other information, i.e. tips, and focuses mainly on checkin, as evidenced below, but it still knows how to please it’s users with a history log of checkins, maps to show what parts of the world have been explored, numbers of checkins, rankings, and badges, and stickers galore.

There can’t be much argument. Of the three, Dennis Ritchie is the only person who has legitimate claim to being a computer scientist. Ritchie technically did not complete his PhD, having failed to submit a bound copy, but this is ultimately meaningless. Even without the PhD, his major contribution (the C programming language) stands as a landmark achievement. He contributed both to Multics and UNIX, and was given the Turing Award in 1983 (along with Ken Thompson).Bill Gates did publish a bit of work in theoretical computer science, developing a new algorithm for a pancake sort. It’s not profoundly important, but it was a significant accomplishment for a young undergraduate. Gates is principally a tech entrepreneur turned philanthropist. He was an extraordinary programmer in his day, but that’s an application area.Linus Torvalds is a developer and development manager, and to some minor extent, an open source software advocate. The Linux kernel is a wonderful and amazing piece of software, and it has influenced computing arguably as much as Microsoft has, but again, that’s an application area.Being a computer scientist is not better than being a developer or an entrepreneur (or worse). It’s different. Dennis Ritchie is one of the most consequential and important computer scientists of his generation. We still use C and its derivatives, and new systems programming languages are invariably compared to C.