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Pythagorean Theorem Proof in Less Than Three Minutes

Here;'s a video I posted on YouTube. The video shows an visual and elegant proof of the Pythagorean Theorem. I never while this while in public schools when I went through it many, many moons ago.  Let me know what you think by contacting me at john@e-liteworks.com.

Trigonometry and What the Heck is SOH CAH TOA?

This is not a rigorous post in trigonmetry but a basic introduction to what trigonometry is and how it's used.  First review the short video below on the mnemonic SOH CAH TOA and then I'll highlight some applications on trigonometry:   One use of trigonometry is to find distances by measuring angles.   When the object's ...

Matlab Examples - Generating AM from a Sampled Signal

Here is an example on how to generate an AM signal from a Sampled Signal:

Matlab Examples - Amplitude Demodulation Using Envelope Detection

Another detection scheme is called envelope detection consisting of a simple diode and a low pass filter ( a parallel connection of a resistor and capacitor).The low pass filter gets rid of the higher frequencies coming out of the diode and to allow the low frequency message signal to pass ...

Matlab Examples - Amplitude Demodulation using Coherent Detection

My previous post talked about modulating the amplitude of the carrier to embed a message signal. The demo uses Simulink found in Matlab. Here, I will show how we can recover our transmitted message using synchronous detection (coherent or homodyne detection). Synchronous detection does not waste any energy in ...
 

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Blog Posts

Matlab Examples - Amplitude Demodulation Using Synchronous Detection

Here is a Matlab demonstration using Simulink on synchronous detection. Synchronous detection is used to demodulate Double Sideband Suppressed Carrier AM (DSB-SC AM). Also known as coherent or homodyne detection, the scheme requires phase information to track the phase drift of the transmitted carrier in order for this detection scheme to work. A basic component used to achieve this detection scheme is a phase-locked loop (PLL) circuit. The PLL circuit is more complicated than the envelope det… Continue

Posted by John Santiago on June 27th, 2008 at 2:30pm — No Comments (Add)

Matlab Examples - Amplitude Modulation

Here is an example using Matlab's Simulink to demonstrate the concept of Amplitude Modulation. Two types of amplitude modulation schemes are discussed: Double Sideband Suppressed Carrier (DSB-SC) AM and Double Sideband Large Carrier (DSB-LC) AM. DSB-LC AM is used your standard and commercial AM radio. Continue

Posted by John Santiago on June 25th, 2008 at 5:00pm — No Comments (Add)

Discrete-Time Convolution Examples (Inverse z-Transform)

You can view the convolution as the inverse z-Transform of Y(z)=H(z)U(z) where Y(z), H(z), and U(z) are the Laplace Transform of the output sequence response, impulse system response, and input sequence, respectively. DVDs are in progress and are based on market demand on selected topics. Part 1 - Introduction This is an introduction to the convolution sum before giving you an example in Part 2. Continue

Posted by John Santiago on April 20th, 2008 at 4:00pm — 1 Comment (Add)

Continuous-Time Convolution Examples

Here are updated videos on the Continuous-Time Convolution Problem. Part 1- Introduction (to be posted soon) Part 2 - Continuous-Time Convolution Example You can v… Continue

Posted by John Santiago on April 20th, 2008 at 3:30pm — No Comments (Add)

Space Orbital Mechanics

This blog will discuss orbital mechanics. Please visit this blog article as I will be posting more updated videos on this topic. Keppler's Three Laws Part 2 - Two-Body Diag… Continue

Posted by John Santiago on April 7th, 2008 at 1:00pm — No Comments (Add)

 
 

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