Chirp Generation

[Evewillson]

In the MainActivity, based on the code for generating the signal, it seems that the frequency sweep signal with a frequency range of 16k-19kHz is not achieved, despite setting the frequency slope as c/2 with CHIRP_DURATION equal to 0.04 seconds.

[Pragma-cpu]

For generating the original chirp signal between any range of frequencies (<~22kHz), please replace the section under genTone() with the following code:
for(int i=0; i < CHIRP_DURATIONSAMPLE_RATE; i++)
{
x=(double)(i)/(double)(CHIRP_DURATIONSAMPLE_RATE);
yy=F11+(x*(F12-F11));
sample[j++]=Math.sin(2Math.PIi/(SAMPLE_RATE/yy));
}
For using the earpiece speaker, the following changes can be made:
audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);