Langley VA

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About Langley VA

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  1. Thanks! I'll really have to get myself up to speed on what's happening under the hood with these speech processing tools. NaturallySpeaking is one that was recently brought to my attention by word of mouth (no pun intended). Rosetta Stone language software also seemed to showcase something along those lines. Maybe it was just correlating phrases it could anticipate, but it was interesting to say the least. In short: on to XVoice and CMU Sphinx!
  2. Since we're on the subject. ...Sort of. What's generally the best utility out there for actual speech-to-text input? IE: Hands-free notes and so on? I found a couple, but I want your advice first.
  3. You're right. The 2.2uF capacitor is being used as a high-pass tool. To be precise, it will couple the heart rhythm and other AC signals, while blocking the unwanted DC bias. That makes it easier for the other input components to center the input on a range the amps can accept without going into distortion. The variable resistor basically makes a voltage divider for the output of the 1st op amp. In the event that you get too much distortion, you can adjust this dial and keep the 1st op-amp from over-driving the 2nd; and the 2nd from over-driving itself.
  4. That's actually a great idea. I've been looking to private liquidations lately, but it never quite occurred to me to look for sat phones for some reason. I guess for data, I'll stick to the ARRL way to doing things for now. In the long term, it could worthwhile to time-share it among people I know and just split the expense. One more thing I wanted to look into was the signal reliability and quality. The handhelds don't work indoors, but would they work in a vehicle?
  5. It is a recession after all. Minus the pinstriped suits and tommy guns.
  6. This is encouraging. I remember looking at Powerstor's supercapacitors back in the day, and now EEStor has this. Hopefully it won't take long for the industry to get competitive enough to drive those production costs down.
  7. One of the things on my list for 2009 or whenever the recession clears is looking into satellite telephony. Mainly, I'm interested in using a service as backup line of voice & data service in the event of your natural disaster, zombie invasion, or what have you. International travel and rural exploration are also on the table. Second to having a high-powered ham rig, this seems like the most bullet-proof line of long distance communication available. Now, these things are a substantially bigger investment than say...a mobile. So I'm window shopping. I'm wondering if anyone here has any experience or remarks to add regarding these phones. Or the providers (Iridium, GlobalStar, etc). This isn't really a hacking/phreaking request so much as just vacuum for information. Where/When did you use it? Did you like or dislike it? What have you heard about these services?
  8. Yeah, I'm thinking if you want to automate the process; the most-direct way would be to correlate it against a library of known formats. Using an FFT. At the hardware level, an FPGA could be loaded with an FFT of each signal sample. Then you run one of many correlation algorithms, and then generate -say- a list of the top 10 most likely formats. At the PC level, you could maybe use something like Matlab or Scilab to achieve the same goal. But like jfalcon said, training the ears and memory can be just as rewarding.
  9. What ever happened to that European study that supposedly cracked the Keeloq rolling code system? I remember they published a lot of vague cryptographic theory, but I never saw any code, flowcarts, or anything usable. I mean...whatever happened to it?
  10. It really depends on what components you have direct access too. The Collpits oscillator requires only a transistor, resistances, capacitances, and a single inductor. The low part requirement makes it a favorite over other oscillator types. The disadvantage is inductors are hard to find unless you order online. Also, you'd probably have to use a special toridal inductor to keep your RFID transmitting coil from interfering with it. You can also get a sine wave out of a square wave by feeding it through a lowpass filter. Sometimes, even a single RC lowpass filter will block the upper frequencies enough for RFID use. By putting 2 filters back-to-back, you'll get closer to a pure sinusoid. Personally, I'd go with this method because it works well microcontrollers and other digital devices.
  11. I'd like to revive this question because the need comes up for me personally on a monthly basis. I've gotten good results out of AT&T's reverse directory, but just like 411, it doesn't apply to mobles. Intelius goes a little farther, but only narrows it down to the provider and locality. Is there anything (free or otherwise) that can do reverse cellular lookup?
  12. I friend of mine was telling about some program that alerts you when a program is trying to modify the registry. But I didn't catch the name. Does anyone here know of a good utility for that kind of thing. I'm using it for 32 bit Win XP.
  13. Is there some kind of utility for SIM card interfacing? I hear detectives use them all the time but appearantly, they're secured by a manufacturer's code.
  14. Looks like my Ubuntu will be delayed another week or two while I get one last project out of the way. I'd like to keep these suggestions open. As far as learning the overall Ubuntu interface, and developing C programs; are there any must-see tutorials outside of ubuntu.com and binrev? Specifically, I'm trying to develop hardware-to-PC interfaces and try some beginner-level encryption if time allows.
  15. Actually, I did some reading on the car hacking thing. If you could physically get to the SAE data port under the steering column, one could attach an CANopen interface. Assuming the programmer was familiar with the car model, they could have a ┬Ácontroller send packets to shut off the fuel pump, transmit false O2 readings, or something along those lines. Or just mess up the fusebox for the direct approach. But to reiterate, you'd have to get inside the vehicle. Anyways, I'll probably watch it friday. It beats hanging around the web all night.