From 14c854543b1a3cf344a371a5b45595657f95786b Mon Sep 17 00:00:00 2001 From: leochanj105 Date: Tue, 26 Oct 2021 13:22:32 -0400 Subject: add deadlines and costs --- all_pairs/source/audiobeam/README | 86 --------------------------------------- 1 file changed, 86 deletions(-) delete mode 100644 all_pairs/source/audiobeam/README (limited to 'all_pairs/source/audiobeam/README') diff --git a/all_pairs/source/audiobeam/README b/all_pairs/source/audiobeam/README deleted file mode 100644 index e228eda..0000000 --- a/all_pairs/source/audiobeam/README +++ /dev/null @@ -1,86 +0,0 @@ -Readme file for Oxygen beamforming source code distribution ------------------------------------------------------------ - -This is a very very beta distribution of beamforming source code from -MIT LCS. - -There is only one source file, main.c, and one header file, -main.h. You can compile everything using the Makefile included in the -distribution. - -The input to the program is a text file containing floating -point values for the signal read on each of the microphones. For n -microphones, each line of the text files represents a temporal sample -and should contain n floating point values separated by spaces, e.g.: - --1.8569790e-004 -9.0919049e-004 3.6711283e-004 -1.0073081e-005 ... - -There are several modes of operation for the program: - -1. The most basic mode is to process the microphone data and to -calculate the output based on one beam focused on a particular point -in space. The coordinates for the microphones and the focus point are -specified inside main.c (eventually to be moved to a separate file). - -2. Far field search mode. This mode assumes a far-field source (which -means we have a planar wavefront) and a linear array, and sweeps over -180 degrees in the plane of the array. The microphone coordinates are -specified in main.c, and the NUM_ANGLES constant defines how many -angle values should be tested (a value of 180 means one beam per each -degree). The energy of the signal over a particular window -(ANGLE_ENERGY_WINDOW_SIZE) is computed for each beam. The direction -with maximum energy is considered the direction that the speech signal -is coming from, and is printed out by the program. - -3. Near-field hill climbing mode. This mode accepts a starting -coordinate and attempts to "hill-climb" through the space seeking the -maximum energy. Each of the x, y, and z coordinates are perturbed in -the positive and negative directions at each time interval -(GRID_ENERGY_WINDOW_SIZE) by a step size (GRID_STEP_SIZE). This -perturbation, along with the original coordinate, produces seven -coordinates to be tested. The direction with the maximum energy -replaces the current reference coordinate. For instance, if we have a -starting reference coordinate of (1,1,0) and our step size is 0.01, we -will evaluate the energy for the following seven beams: - -(1,1,0) -(0.99,1,0) -(1.01,1,0) -(1,0.99,0) -(1,1.01,0) -(1,1,-0.01) -(1,1,0.01) - -Now let's say the beam (1,1.01,0) has the maximum energy; then this -coordinate will replace the original reference coordinate of (1,1,0). - -For methods 2, and 3, we are not outputting anything to disk, we are -just printing the result. This is because we have just started to work -with these methods, and have not applied them in real systems. This -code is currently being ported to RAW. - -To get a list of parameters for the delay_and_sum executable that is -generated when the source is compiled, just type ./delay_and_sum . - -There is some sample data included with the program, in the data -directory. There is some data for a near-field and far-field -source. The README.txt file in each directory specifies the microphone -and source position. The data1 file, when processed with a beamformer -aligned in the proper direction should produce something like a sinc -function (see -http://ccrma-www.stanford.edu/~jos/Interpolation/sinc_function.html). - -The data2 file should produce an audio signal of a woman saying "the -simplest method". If the beamformer is aligned properly, the noise -should be reduced significantly over the source signal from only one -of the microphones (use print_datafile.pl to isolate one -microphone). You can convert the data file that the program produces -to wave files using sox. - - - - - ---------------------------------- -Eugene Weinstein -ecoder@mit.edu \ No newline at end of file -- cgit v1.2.2