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Hello, edaboard.
I created this "sound recognition doohickey" yesterday in simulink. It computes a correlation coefficient between the spectral estimation of audio being picked up by my laptop microphone and the spectral estimation of stored audio in attempt to "listen" for a specific melody. I...
Glad to help. Here are some resources to get you started.
Energia IDE: https://www.energia.nu/
VirtualWire Library: (Install in 'hardware\msp430\libraries' directory of your energia installation.)
Examples:
VirtualWire documentation: **broken link removed**
Custom Transmitter Example...
I developed a wireless system with an MSP430 and a cheap receiver/transmitter pair. You can get them for about five bucks on amazon. I think I used this one.
With this setup I was achieving about 20 ft communication with no antenna and only about 2 volts supply. If you add an antenna (an...
Thanks for all that information, Rob. I can't wait to start getting parts in. Here is some more information about the general design goals and sensor output.
The sensor is an accelerometer. Its design is comprised of a single suspended-gate field effect transistor that can be powered at length...
Rob, thanks for the response, great feedback. I did notice that BLE isn't widely implemented at the moment. I'm hoping this will change in the near future. As it happens, about half of the employees in our lab own a Samsung Galaxy S4 which reportedly supports BLE. So for in-house purposes at...
Thanks for the response. I have in fact found some great technical support from a company called Emmoco based in Austin, Texas. As of now, I think i'm going to start with the following hardware:
Emmoco development board: **broken link removed**
MSP430 Launchpad...
Hello,
I have an analog voltage signal coming from a low-power proprietary sensor that I would like to monitor wirelessly from a local computer or smart device. My objective is to wirelessly log this data, from a short range, while maintaining low power consumption.
Bluetooth 4.0 (aka...
If you have N random variables that belong to a family (ensemble) of random variables, which describe a random process, then yes, your covariance matrix will be NxN and you will use the process that we discussed above.
It's just that, based on your description of the noise vector, it sounds...
Ah, I believe I see where you're confused now. A random vector isn't a vector filled with random samples. A random vector is a vector filled with random variables! [ref]
A variable is the process or phenomenon from which you're recording samples. A sample is like a single observation of one...
David, can you provide a source that supports that statement? As I understand it, the covariance matrix has MxM dimensions, where M = number of variables, not the number of samples in each variable.
So, the covariance matrix of variables x and y is then:
Where Cov(x,y) =...
Sure, you could do that.
And because you're taking the covariance an array with 2 columns in your example, your covariance matrix will be a 2x2 matrix so it wouldn't be hard to analyze.
For example:
N = 1024;
noise = zeros(N,2);
for ii = 1:2
n = wgn(N,1,1); %creates a Nx1 vector of...
Well, you don't have to. Can I ask what kind of data you're trying to interpret?
Here's an example that may explain things better. Let's say I have some time samples of a signal, y, which is a sine wave and a signal, g, which is a sine wave that is shifted by pi/8. If I want to check the...
You just use the cov() function.
But, if you're trying to find the covariance of one vector, that is, one vector containing samples of one variable, matlab is going to give you the variance. Covariance is a statistic used for bivariate relationships, which is fancy wording for "comparing two...
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