Kreeger Research

ref:octave:filter_design

mike (mike@undisclosed.example.com) — 2018-05-31T22:06:07+0000

Octave Filter Design Example # do this one time pkg install control-3.1.0.tar.gz pkg install signal-1.4.0.tar.gz pkg list pkg update Filter design pkg load signal % Simple but has a large transition band and only about 50 to 60 db attenuation freqz(fir1(63,0.125))

matlab:freqplots

mike (mike@undisclosed.example.com) — 2017-02-26T20:31:03+0000

Frequency Plots with Matlab/Octave When doing frequency analysis of signals its always important to remember to window the input data prior to performing a FFT. If the data is not windowed and the signal of interest does not fall into a single FFT bin (meaning it is continuous about the length of the FFT) then there will be noise across the entire bandwidth. The code will normalize the largest spectral component to 0dB making it easy to compare relative strengths of signals for measurement of S…

c_11:start - [Examples]

mike (mike@undisclosed.example.com) — 2017-02-25T18:05:37+0000

C++11 Language Examples * dir_list.cc * chrono_stop_watch.cc * thread_2.cc * port_scanner.cc References * C++ Core Guidelines * Bo Qian examples and videos * Where do I find The current C++ Standards * C11 Standard n3797 * Using PThreads in C/C++

c_11:examples:port_scanner.cc - created

mike (mike@undisclosed.example.com) — 2017-02-25T18:04:01+0000

Port Scanner #include #include #include #include #include #include #include static bool port_is_open(const std::string& address, int port) { return (sf::SocketTCP().connect(address, port) == sf::Socket::Done); } static std::vector split(const std::string& string, char delimiter = ' ', bool allow_empty = false) { std::ve…

c_11:examples:thread_2.cc - created

mike (mike@undisclosed.example.com) — 2017-02-25T18:02:30+0000

thread_2.cc #include #include #include using namespace::std; // gcc -std=c++11 thread_1.cc -lstdc++ -o thread_1 std::mutex mu; void shared_print(string msg,int id) { std::lock_guard guard(mu); // RAII - when guard goes out of scope //mu.lock(); // if cout throws an exception then the program will be locked forever. cout << msg << id << endl; // still could mess up output if other process writes to cout. //mu.unlock(); } void fun1() { …

c_11:examples:chrono_stop_watch.cc - created

mike (mike@undisclosed.example.com) — 2017-02-25T18:01:48+0000

#include #include #include long fibonacci(unsigned n) { if (n < 2) return n; return fibonacci(n-1) + fibonacci(n-2); } int main() { std::chrono::time_point start, end; start = std::chrono::system_clock::now(); std::cout << "f(42) = " << fibonacci(42) << '\n'; end = std::chrono::system_clock::now(); std::chrono::duration elapsed_seconds = end-start; std::time_t end_time = std::chrono::system_clock…

c_11:examples:dir_list_cc - created

mike (mike@undisclosed.example.com) — 2017-02-25T18:01:06+0000

#include #include #include // To Build: gcc -std=c++11 dir_list.cc -lstdc++ -o dir_list int getdir (std::string dir, std::vector &files) { DIR *dp; struct dirent *dirp; if((dp = opendir(dir.c_str())) == NULL) { std::cout << "Error(" << errno << ") opening " << dir << std::endl; return errno; } while ((dirp = readdir(dp)) != NULL) { files.push_back(std::string(dirp->d_name)); } closedir(dp); re…

start - [FPGA PROGRAMMING]

mike (mike@undisclosed.example.com) — 2017-02-25T17:59:33+0000

Signal Processing * Filter Design Using Octave * Frequency Plots with Matlab/Octave - Windowed Frequency Transforms Computer Languages * C++11 examples FPGA PROGRAMMING Hardware Description Languages (HDL's) * Verilog HDL Tips and Tricks * OpenCL Quick Links * Back to Company Info

ref:octave:remez_100db.png - created

mike (mike@undisclosed.example.com) — 2017-02-22T06:22:04+0000

wiki:kreegerlogo.jpg - created

mike (mike@undisclosed.example.com) — 2016-07-02T21:30:10+0000

wiki:dokuwiki-128.png - removed

mike (mike@undisclosed.example.com) — 2016-07-02T21:21:19+0000

wiki:logo.png - created

mike (mike@undisclosed.example.com) — 2016-07-02T21:19:09+0000