source: orbit/octave/GenerateAudioCommand/initCodeGenAndroid.m @ f22b7ab

function initWave=initCodeGenAndroid(audioFileName,sps); 

% code: array of 1s and 0s. 1 means bit "1", 0 means bit "0".
% audioFileName: like 'audio.wav'.
% Multiplyer: value around 1, to change "carrier" period.
bps = 16;       % bits per sample

_longHIGH=1000; %[us]
_longLOW=2000; 
_mediumLOW=500;
_shortHIGH=100;
_shortLOW=180;
_pause=10000;
_space=84354;

longHIGH=floor(_longHIGH*sps/1e6)-1;
longLOW=floor(_longLOW*sps/1e6)+1;
mediumLOW=floor(_mediumLOW*sps/1e6)-1;
shortHIGH=floor(_shortHIGH*sps/1e6)+1;
shortLOW=floor(_shortLOW*sps/1e6);
pause=floor(_pause*sps/1e6);
space=floor(_space*sps/1e6);

initWave=[halfSineGenDirect('u',longHIGH,0,1,sps);zeros(longLOW,1);halfSineGenDirect('u',longHIGH,0,1,sps);zeros(longLOW,1);halfSineGenDirect('u',longHIGH,0,1,sps);halfSineGenDirect('d',mediumLOW,0,1,sps);halfSineGenDirect('u',shortHIGH,0,1,sps)];

initWave2=[initWave;halfSineGenDirect('d',shortLOW,0,1,sps)];
initWave=[initWave;halfSineGenDirect('d',mediumLOW,0,1,sps)];


for i=1:4
        initWave=[initWave;halfSineGenDirect('u',shortHIGH,0,1,sps);halfSineGenDirect('d',shortLOW,0,1,sps);];
        initWave2=[initWave2;halfSineGenDirect('u',shortHIGH,0,1,sps); halfSineGenDirect('d',shortLOW,0,1,sps);];
        endfor

initWave=[initWave;halfSineGenDirect('u',shortHIGH,0,1,sps);halfSineGenDirect('d',mediumLOW,0,1,sps);halfSineGenDirect('u',shortHIGH,0,1,sps)];

initWave2=[initWave2;halfSineGenDirect('u',shortHIGH,0,1,sps);     halfSineGenDirect('d',mediumLOW,0,1,sps);halfSineGenDirect('u',  shortHIGH,0,1,sps)];

initWave=[initWave;zeros(pause,1);initWave;zeros(pause,1);initWave;zeros(pause,1);initWave2;zeros(pause,1);initWave2;zeros(pause,1);initWave2;zeros(pause,1)];



wavwrite(initWave, sps, bps, audioFileName);