Digital Signal Processor (DSP)overview
Digital Signal Processor(DSP) is a digital signal processing Java applet designed upon principle integration formulas, signal data set and their graphical presentations. Originally this module was developed as a part of seismic data processing system WSG for Windows 9x/NT/ME/2000/XP and was written in Microsoft Visual C++. Window formulas are the kernel of DSP: any window can contain a formula defining its contents. This formula can reference signal in other Windows, incorporate mathematical functions, and generate signals. In some cases this program is similar to the DADiSP software package. Current version of DSP support up to 16 windows. Also 8 graphics may be overloaded on to the current window.
Digital Signal Processorfunctions list.
abs(W) - Produces the absolute value of any expression. Example
conv(W1, W2) -Convolves two signal W1 and W2. Example
exp(W) - e**W (e=2.71828...)
extract(W, start, length) - Makes a new signal by extracting a portion of another signal. Example
gcos(points, spacing[, n [, j ]]) - Generates a cosine curve cos(2*p *n *t+j ). Example
gline(points, spacing, a, b) - Generates a line y=a*t+b. Example
gsin(points, spacing[, n [, j ]]) - Generates a sine curve sin(2*p *n *t+j ). Example
Warning: W padding zeros to signal length will be power of 2. Example
integ(W)- - Calculates the integral of the W. Example
kaiser(W[, b ]) - Multiplies a signal by Kaiser window. W padding zeros to signal length will be power of 2. Example
linreg(W) - Determines the best linear fit to a signal. Returns generated line. Example
mean(W) - Finds the mean value of the W. Example
rand(points, spacing) Generates points pseudorandom numbers between 0.0 and 1.0. Example
refft(W) - Real part of the first half of the FFT of W. W padding by zeros to signal length will be power of 2.Example
spectrum(W) - Returns the magnitude of the first half of the FFT of a signal. W padding by zeros to signal length will be power of 2. Example
[*] - Apply formula (Calculate formula in active Window). Equivalent pressing enter key.
[W+] - Add new window.
[W-] - Remove active window.
[Lock] - lock window to protect data associated with active Window from changing. Disable formula editing element.
[>] - Scroll window right.
[<] - Scroll window left.
[Up] - Scroll window up.
[Dn] - Scroll window down.
[+Vert] - Expand vertical.
[-Vert] - Compress vertical.
[+Horz] - Expand horizontal.
[-Horz] - Compress horizontal.
[#] - Fit graphic to window
[Copy] - Copy data from active window to Data Exchange Board.
[Paste] - Paste data from Data Exchange Board to active window.
[Import] - Run dialog box where you can enter your own new data in the ascii format or edit existing data associated with current active window.
[Overplot] - Overplot a signal from Windows onto current Window.
In order to zoom in on a portion of the graphic press Shift button on your keyboard, then press left mouse button on the top corner selected field, then move mouse pointer to the bottom corner and release mouse button. Graphic should be automatically redrawn in new scale.
If you like this applet please download DSP on Java standalone application based on the same technology. To run this software you need JVM 1.2 and above.
Download DSP on Java -> dspjava.jar
After download enter java -jar dspjava.jar to start application.
Senior Software Engineer, CEME GS RAS