Recent content by makovx

Infrared works perfectly fine as a watermark on still images (infrared LEDs put at the back of the image) and even videos when the surrounding is dark. Is there a way to make it more noticeable even in broad daylight? And let's say, if my surrounding is dimmer and I want to obscure...

Usually, when calculating the heat required, use the heat transfer equation: Q= mcΔt Q=energy, or heat m=mass c=specific heat capacity delta t= change in time

Can a lux meter measure infrared intensity like it does for the visible light? I read from somewhere that it cannot. If you have an IR illuminator on in the dark and hold up your 'regular' lux meter to it, it will likely register 0 - an unhelpful and misleading result. I'm just wondering if...

Thank you for answering my questions immediately.

Thank you. Are there laws that can be applied in this kind of 'project proposal'. Like 2nd law of motion, or first law of thermodynamics, or even principle of energy conversion? I'm not very familiar with scientific laws, but I have to defend this proposal. How to calculate energy with that...

Yes, I don't think that the amount of energy harnessed from that will contribute a big amount of energy so basically, the generated energy will only power lighting and small loads. But we will just modify the turnstile, like adding a gear system that will connect the turnstile to the generator...

ELECTRICITY GENERATION THROUGH THE CONVERSION OF ENERGY PRODUCED BY REVOLVING GEARS OF A TURNSTILE As the title implies, do you think it's feasible? I'm working on it as a topic on my research subject, but I'm having a hard time. I didn't know that there are lots of principles involved...

Yes, that's the PAM I exactly need. You mean the circuit diagram I posted is a different interpretation of PAM. I see. I'll try using the DAC you suggested then. Thanks :)

Thank you for your immediate response :) I found a pdf file about a laboratory excercise in PAM (and demodulation). I think it's the one I am looking for. The title is: LAB - 3 PULSE AMPLITUDE MODULATION & DEMODULATION and the circuit diagram is: My problem this time is the...

Hi. Who among you know a site where I can find a wiring diagram or schematic diagram of PAM (Pulse Amplitude Modulation)? I badly needed a diagram of it for my prototype in Digital Communications. I've been searching for it in Google but it only gave me different diagrams and I can't tell...

function [flow fhigh]= mydtmf(x) x = input('number from 0-9: ') if x>=0 & x<=9 [flow fhigh]= mydtmf(x) for x==1, disp('flow = 697 Hz') disp('fhigh = 1209 Hz') end for x==2, disp('flow = 697 Hz') disp('fhigh = 1336 Hz') end for...

i tried doing the if...for... else..elseif statements but I still can't do it right. I mean for me to write a function, I have to write something like this function [flow fhigh]= mydtmf (x) wherein x is the number 0 to 9. but it says that variable x is not initialized. what does it mean? how...

Homework Statement I badly needed an urgent help in Matlab. I have to create a Matlab function (M-File) that will output the low (flow) and high (fhigh) frequency components of a DTMF signal given the numeric symbol (x) (* and # not included). I don't even know where to start since...

I finally got your point. Thanks a lot! ^^,

yes. x is the amount of stretch. if the length is L, and the amount of stretch is 1/10, wouldn't be x= 1/10 of L? did i miss something there or is it just my limits of integration that made my answer wrong?