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Explanation of 44.1 kHz CD sampling rate
The CD sampling rate has to be larger than about 40 kHz to fulfill the Nyquist criterion that requires sampling at twice the maximum analog frequency, which is about 20 kHz for audio. The sampling frequency is chosen somewhat higher than the Nyquist rate since practical filters neede to prevent aliasing have a finite…
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Douglas Adams's Mac IIfx
「99歳にもなったら入れる施設なんてあるのだろうか…」こんな悩みを抱えてはいませんか？現代社会は「少子高齢化社会」と呼ばれ、人口に占める高齢者の数が増えてきています。また、医療の発達により寿命はどんどん長くなっており、介護に関する悩みを抱える人も多いのではないでしょうか。
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Petabytes on a budget: How to build cheap cloud storage (2010)
To get the latest updates and information on ALL of the Storage Pod versions: Click Here. When we started Backblaze, our goal was to provide unlimited
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How the Z80's registers are implemented
The 8-bit Z80 microprocessor is famed for use in many early personal computers such the Osborne 1, TRS-80, and Sinclair ZX Spectrum. The Z80...
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Dell XPS 13 Developer Edition review
Please note: I've updated this review in several spots and have highlighted these updates like this . Please also check out the comments-se...
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Designing and building a keyboard
Some years ago, I wanted to make a Nixie Tube clock from scratch. PCB manufacture was so expensive that I ended up just making the PCBs by hand. I figured I would give the market another look, and dang has custom PCB manufacture become cheap! The best/easiest service that I found was OSH Park. I'd never had PCBs made…
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Some small suggestions for the Intel instruction set
Programmers trying to make crypto run fast often say things like "Why can't the CPU designer just add a 128-bit multiplication instruction?" Sometimes these questions turn into academic papers analyzing the cycle counts that would be obtained from various instruction-set extensions. What's missing from most of these…
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TCP/IP over audio
We present a simple to use implementation of networking across ultrasonic frequencies, by making use of Gnuradio and a microphone and speakers. This allows you to use TCP/IP , UDP across an audio link.
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Matchstick Brings Firefox OS to Your HDTV
The first HDMI streaming stick powered by Firefox OS has arrived. It’s called Matchstick and we’re looking for your help to create apps for this new device. Background Matchstick ...
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Why the Z-80's data pins are scrambled
If you look closely at the datasheet for a Z-80 chip, you'll notice the data pins are in a random-looking order. The address pins (A) are ni...
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Evolutionary algorithms and analog electronic circuits
I've been working for a while on a program that automatically generates analog electronic circuits using evolutionary algorithms. It's still very much a work in progress, but I've used it to generate some useful circuits. Current workings of the program is as follows: Programmer decides a goal function, possible…
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Building a simple VGA-adapter for an 8-bit self made computer
(Update 2014-10-30: Due to some interest in this project, I added schematics for the GALs)
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I Build Supercomputers in My Spare Time
Brian Guarraci is a software engineer at Twitter and in his spare time he’s building a Parallella cluster with a design that was inspired by two of the most iconic supercomputers ever made.
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Cheap FPGA Development Boards: What to look for
I bought Avnet's $49 Spartan 3A development board but it was discontinued not long afterward - right about the time when I decided I needed a few dozen more. I've since done some extensive research (thanks, Google!) to find a comparable thrifty thrill.
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Why SSD Drives Destroy Court Evidence, and What Can Be Done About It (2012)
Why SSD Drives Destroy Court Evidence, and What Can Be Done About It: Explore the challenges posed by SSD drives in preserving court evidence and discover strategies to mitigate data loss risks.
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We Need Hardware Traps for Integer Overflow
How many problem domains require wrapping signed integers or non-wrapping unsigned integers? Can the current undefined case be replaced with a trap and everything else be left intact?
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Hacking the Samsung NX300 "Smart" Camera
blog about networking, cameras, old gear, and xmpp
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PunchClock: Fun With iBeacons
Sometimes at Panic we build internal stuff that never sees the light of the outside world. This is one of those projects: an automatic in/out tracker for the Panic Team.
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Depackaging the Nintendo 3DS CPU
If you haven't read my Nintendo 3DS intro blog post first, I'd suggest it as it's a fun short read that gives some backstory of my interest...
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How many Commodore 64 computers were really sold? (2011)
Nobody doubts that the C64 was the greatest selling single computer model of all time, it even made it into the Guinness Book of World Records, but nobody quite knows how many it really was: Most sources say 17 million, others say 22 or even 30 million. With a high degree of confidence, I can now…
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