Search found 74 matches

by VIRAND
Tue Aug 01, 2006 10:14 am
Forum: General Discussion
Topic: Programming a microchip to speak text
Replies: 14
Views: 4616

Having done a lot of speech synthesis I'd suggest 8-bit at 10Ks/s is a good trade off, with 6.5 seconds per 64KB. I think I tried A/Mu law on 4-bits to get 11 sec per 64KB but got better results by normalizing 8 bits and then dumping the lower 4. Using the Roman Black method you get surprisingly goo...
by VIRAND
Tue Aug 01, 2006 2:53 am
Forum: General Discussion
Topic: Programming a microchip to speak text
Replies: 14
Views: 4616

Fifteen minutes? ISD gives around 15 seconds or 2 minutes last I looked. How about using an old flash card, like a 16MB, and program a PIC to record on it? Here is a PIC project that emulates an obsolete Text To Speech Synthesizer. http://home.alphalink.com.au/~derekw/pictalker/main.htm It can say a...
by VIRAND
Tue Aug 01, 2006 2:15 am
Forum: General Discussion
Topic: Goodbye RFID
Replies: 15
Views: 4319

Look! Stevech came here on 6/6/6 to give us the Mark Of The Beast. Dogs, who's your master? Red states, show me your papers! Identify yourself! Open your bibles to Revelation 13 and get your free real estate in Yellowstone National Park. This isn't personal. It's a joke, but like many jokes, not too...
by VIRAND
Mon Jul 31, 2006 3:50 pm
Forum: General Discussion
Topic: Goodbye RFID
Replies: 15
Views: 4319

having worked with RFID in my job (several kinds), the general case is that really cheap RFID tags (teeny capsules or labels) have a read range of 1-4 inches. The amount of RF used to read them is quite small and the emissions are very, very brief. But the lunatic paranoids can still holler. Let's ...
by VIRAND
Mon Jul 17, 2006 8:48 am
Forum: General Discussion
Topic: A Better Mousetrap
Replies: 7
Views: 1847

once we had mice and... I made a solenoid hold up the door to a clear plastic box, which would drop it when the mouse ran across a barely touching wire powering the solenoid and magnets held the door closed. Behind the wire was a fortune-cookie or noodles. This trap usually caught them alive but occ...
by VIRAND
Sun Jun 25, 2006 4:13 pm
Forum: Computer Programming
Topic: Voice Encryption
Replies: 15
Views: 7951

No, not really. DSP is digital signal processing, usually with special fast hard math chips, not just sampling. FFT is Fast Fourier Transform. By magic and advanced math it just works. FFT is used very often in DSP. It is hard to be doing one without even knowing the other. What it does is take a wa...
by VIRAND
Sat Jun 24, 2006 3:40 pm
Forum: General Discussion
Topic: Cars Running On Water
Replies: 17
Views: 4930

According to the above article, The areas where the ethanol plants are planned is, or should be, near the Great Lakes. Of course the aquifers should not be "wasted". Neither should the water be polluted and released in the process, but used again. As the ethanol is used as motor fuel, 2 CO2 + 3 H2O ...
by VIRAND
Sat Jun 24, 2006 3:05 pm
Forum: Computer Programming
Topic: Voice Encryption
Replies: 15
Views: 7951

The most obvious simple DSP process that is interesting and fits in same bandwidth is
to FFT , change the order of the "bins", and IFFT out.

That will probably get you an A+ without attracting black helicopters.
by VIRAND
Fri Jun 23, 2006 2:23 pm
Forum: General Discussion
Topic: Would you buy one?
Replies: 9
Views: 2735

I went to the fuel less flight site VIRAND posted about. Okay, let me get this worked out as it is giving me a headache. A proprietary low-boiling-point-liquid is vaporized into a low density lighter-than-air lifting gas using the heat in the air near the surface. This creates buoyancy that allows ...
by VIRAND
Thu Jun 22, 2006 3:07 pm
Forum: General Discussion
Topic: Wireless data feed
Replies: 2
Views: 1000

Mod a wireless video camera ... or at least an old TV tuner and "RF video modulator". Analog television systems use more real bandwidth than any other common signal. It's easy to get full 1Mbps without overhead from additional layers of abstraction, just do your own error checking on the receiving e...
by VIRAND
Wed Jun 21, 2006 1:04 am
Forum: General Discussion
Topic: Changing a bulb?
Replies: 15
Views: 5284

Last time I changed a light bulb was when they started using LEDs in traffic signals and gave me some of the old fashioned bulbs that they used to use, which for obvious reasons must be made to not require frequent changing. That was a few years ago. Light bulbs that need to be changed are a ripoff ...
by VIRAND
Tue Jun 20, 2006 11:12 pm
Forum: General Discussion
Topic: electronic volume IC question
Replies: 7
Views: 2101

Common TTL logic if you can't program a PIC:
74169 or 74193 chip counts up and down in binary and can be connected to the buttons.
74154 decodes binary to up to 16 levels with a separate pin for each resistor and LED.
by VIRAND
Tue Jun 20, 2006 10:46 pm
Forum: General Discussion
Topic: Would you buy one?
Replies: 9
Views: 2735

Because it would have put the terrorists out of business?

Take a look at this too.
http://www.fuellessflight.com/

And this! The filling station could be a windmill.
http://www.theaircar.com/
by VIRAND
Tue Jun 20, 2006 10:29 pm
Forum: General Discussion
Topic: Similar to a solar cell...
Replies: 16
Views: 6218

It is an urban legend that you can get in trouble for getting power from coils. If you get enough power to light up a light bulb, you probably would get cancer if you didn't use it. Think about it. If you live under power lines and people get shocks from your fence, and you could solve the problem w...