In the open source code called Freeswitch, there is a code based called tone_detect and mod_avmd.
I need to modify it to be able to detect a certain sound signal.
This project should be easy to do.
I will provide knowledge of FS and environment setup, and sample test bed.
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I have a lot of experience in determining tone frequencies using different methods: frequency discriminator, FFT, zero crossing. I also have a lot of experience in implementing tone detection methods in C and Matlab