Does anyone knows how to synthesize audio signal using C++ or phyton?

Answer 1

For C++, you can find links of a few external libraries here:
https://dsp.stackexchange.com/questions/912/analogous-library-to-opencv-for-audio-processing-analysis
https://stackoverflow.com/questions/6938634/any-opencv-like-c-c-library-for-audio-processing
For Python, you can refer to these links:
http://people.csail.mit.edu/hubert/pyaudio/
https://dsp.stackexchange.com/questions/2610/scipy-audio-processing
https://www.quora.com/What-is-the-best-audio-signal-processing-library-for-Python

Answer 2

For C++, you can find links of a few external libraries that you will need to use for your task, here:
https://dsp.stackexchange.com/questions/912/analogous-library-to-opencv-for-audio-processing-analysis
https://stackoverflow.com/questions/6938634/any-opencv-like-c-c-library-for-audio-processing
You can then refer to their documentations for more details.
For Python, you can refer to these links:
http://people.csail.mit.edu/hubert/pyaudio/
https://dsp.stackexchange.com/questions/2610/scipy-audio-processing
https://www.quora.com/What-is-the-best-audio-signal-processing-library-for-Python