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diff --git a/cad/basicdsp/files/basicdsp.1 b/cad/basicdsp/files/basicdsp.1 new file mode 100644 index 000000000000..2bd112485a5e --- /dev/null +++ b/cad/basicdsp/files/basicdsp.1 @@ -0,0 +1,41 @@ +.Dd June 16, 2008 +.Os Unix +.Dt basicdsp 1 +.Sh NAME +.Nm basicdsp +.Nd DSP demonstration program +.Sh SYNOPSIS +A program for experimenting with simple audio DSP algorithms. +.Sh DESCRIPTION +.Pp +BasicDSP is a program to apply simple Digital Signal Processing algorithms +to audio signals. The input can either be taken from the sound card, or +be a locally generated sine wave, white noise or impulse signal. The output +is fed to the sound card, as well as to a virtual oscilloscope and spectrum +analyzer. +.Pp +The DSP algorithm itself is specified in a very straightforward programming +language which has only assignment statements (and on unix a print statement). +Each line contains one statement, and all lines are executed once for each +incoming sample. The input sample is available in variables named 'in', +'inl' (left channel) and 'inr' (right channel). The program should write the +output into variables named 'out', 'outl' and/or 'outr'. +Here's a simple example program: + + a = a + slider1 * (in - a) + outl = a + outr = fir(in, 0.1, 0.3, 0.3, 0.1) +.Pp +This illustrates defining new variables ('a' in the example), the use of +the sliders, and the use of a built-in function like fir(). +The help-menu gives access to a complete list of built-in variables and +functions. +.Pp +Note: the program was originally written to accompany a series of articles +on Software-Defined Radio appearing in the Dutch amateur radio journal +\'Electron\'. Another tutorial appeared in the December 2007 issue of SPRAT. +.Sh PROJECT WEBSITE, DOCUMENTATION +http://wwwhome.cs.utwente.nl/~ptdeboer/ham/basicdsp/ +.Pp +.Sh AUTHORS +Pieter-Tjerk de Boer, Niels A. Moseley |