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C Unleashed Richard Heathfield Lawrence Kirby et al. Sams Publishing 2000 ISBN 0672318962 |
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C Unleashed Richard Heathfield Lawrence Kirby et al. Sams Publishing 2000 ISBN 0672318962 |
I suggested addressing the subject by writing about several different aspects where C code is used to address real world situations most programmers, Internet surfers, and computer users deal with everyday. Since this was a book about C programming, and not about mathematical algorithms, I liked this approach better than a what I considered the "typical" subject matter, yet another description of the FFT (Fast Fourier Transform, do a net search if you like).
Also, I'm not sure I remembered all the math, since I've never actually had occasion to use an FFT in a project in my entire career... :-)
I actually wrote about three aspects of real-world, everyday digital signal processing:
If you do decide to buy the book, shop around. Prices can and do vary widely and substantial discounts are available.
While I can't post the text of the chapter itself, all of the source code and text files that accompanied it were published and are copyrighted under the GPL (GNU General Public License) which allows free redistribution and modification, so I have placed them on this site with links to them on this page under the terms of that license.
You may view a copy of the license here. You may make any use you like of these files as long as you follow the terms of that license.
If you have questions or comments about any of these files, or the text of Chapter 18, please email me at this address, and not to my regular email address. If you have any issues with the book text or these files that you think warrants attention from a wider audience, feel free to post to the newsgroups comp.lang.c or comp.lang.c.moderated.
I submitted sample graphics to Sams for their illustrators to use in generating the actual figures printed in the book. I am not terribly happy with the final six figures, the ones showing graphical results of the PID sample code. My originals were in color and I think they looked much better.
But the BIG PROBLEM is that the description of the graphics in the book is wrong!
At the top of page 829 it says: "For all the graphs in this section, the dashed line represents the set point and the solid line represents PV, the process variable."
Wrong!!! In figures 18.7 through 18.12, inclusive:
| File | Size | Description |
| Fig18-07.jpg | 37,949 | JPEG of my original sample for the illustration |
| Fig18-08.jpg | 32,968 | JPEG of my original sample for the illustration |
| Fig18-09.jpg | 32,896 | JPEG of my original sample for the illustration |
| Fig18-10.jpg | 32,353 | JPEG of my original sample for the illustration |
| Fig18-11.jpg | 35,459 | JPEG of my original sample for the illustration |
| Fig18-12.jpg | 34,287 | JPEG of my original sample for the illustration |
| File | Size | Description |
| Chap18.txt | 4,035 | A text file describing the contents and use of some of the other files referenced on this page |
| encode.c | 18,733 | A program that encodes binary pixel data into Group 3 Fax (T.4) format (requires fax.h) |
| decode.c | 30,833 | A program that decides a T.4 file generated by encode.c back into binary pixel data (requires fax.h) |
| fax.h | 1,276 | A header file required for inclusion in both encode.c and decode.c |
| text2bin.c | 240,894 | This program generates binary pixel image files, suitable for encoding by encode.c, from ASCII text files (see Chap18.txt for more information). Note size, contains large character generator arrays! |
| lj300.c | 3,213 | This program will generate files for an HP LaserJet or compatible printer to output the images from encode.c, decode.c, and test2bin.c (see Chap18.txt for more information) |
| pidloopc.txt | 8,662 | Some documentation for the pidloop.c PID control loop simulator program and the *.pid files it can accept as input |
| pidloop.c | 37,166 | Source code for a PID control loop simulator, documentation in pidloopc.txt |
|
accel1.pid accel2.pid id.pid ionly.pid pid.pid step.pid |
632 666 687 651 701 1,359 |
Assorted input files for pidloop.c, see pidloopc.txt for information |
| script.c | 5,137 | Program that parses the output from pidloop.c and generates an AutoCAD script to draw graphs of the results, can be used as a starting point if you have another graphic program that can process scripts |
| parity.c | 1,987 | Very simple program that generates a parity bits for strings of ASCII characters |
| chekline.c | 1,731 | Contains code to illustrate computing simple checksums on strings read from stdin with the standard function fgets() |
| hamming.c | 7,090 | Program for generating and checking (12,8) Hamming codes |
| crcccitt.c | 4,682 | Program for generating CRC-16 values using the CCITT algorithm used in Group 3 fax operations |
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