Doppler Radar Download For Pc
This program is a Doppler RADAR for a PC. In reality it’s a sonar that can determine the velocity of a moving object in relation to the PC speaker/mic when you put the speaker and mic near each other like in a laptop.
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This program is written in Python 3.5 and works in real-time using the PyAudio interface and NumPy.For this reason, in windows I have used the Anaconda 3.5 Distribution.
This program is an implementation of the paper by Microsoft Research:
Weather Radar Download Free
SoundWave: Using the Doppler Effect to Sense Gestures
Sidhant Gupta, Dan Morris, Shwetak Patel, Desney Tan
Proceedings of ACM CHI 2012, May 2012
http://research.microsoft.com/en-us/um/redmond/groups/cue/SoundWave/
It has been inspired by a similar project that also implements this paper but for Javascript/Browser.
https://github.com/DanielRapp/doppler
To test this program, you should disable in the microphone settings, the echo cancelation and the noise reduction. In a small number of laptops, you must use an external microphone because the frequency response of those microphones has no gain at high frequencies, but this is rare.
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#How the program works?This program makes two things at the same time, first it generates a sine wave of 18KHz that is outputted by the speakers and at the same time, it is processing the input of the microphone. All this action occurs in a callback function of the PyAudio frameworks that interfaces with the sound board of the computer. Each time the callback in called it receives a buffer with the microphone data of size 1024 and then it accumulates in a 2048 buffer, it then makes the FFT of that buffer and look for the amplitude of the signal at the frequencies around the 18KHz primary tone that we generate. If we move hour hand in the direction of the microphone we compress the sound wave, this means that there will be some amplitude in the frequencies upper to 18Khz, if we move hour hand away we will see some amplitude in the frequencies bellow the 18KHz. This is the Doppler effect and is why you hear a difference sound when a car passes through you pressing the horn. This is also the what police RADAR uses but that is with electromagnetic waves and this is also why we know the starts of distant galaxies are going away from us. That the universe is expanding. In the last case, the light of supernovas is becoming more reddish that it should be if they weren’t moving away. Light is also a electromagnetic wave.
Going back to the program, then in the callback we put the result is a global variable doppler_shift and we copy the previous generated sin tone of 18KHz into the output buffer of the callback. Sound blaster x-fi drivers windows 10 for free.
In an external thread we periodically (0.5 seconds), see the value of this variable and print it to the screen as a text graph, at the end we plot the last FFT graph so we can see the signal.
Doppler Radar Download For Pc Mac
MIT license.