I have an audio circuit setup currently in which a microcontroller (PIC32MM) sends PWM signals to an amplifier which is attached to some speakers in order to hear what is going on. I have attached a diagram of the connection from the micro to the amplifier.
When testing the code, I can hear that sound is being emitted, but it is in a distorted and high pitched way that I cannot make out the sounds, since it should be saying specific words.
I have also attached oscilloscope graph of signal coming from the micro with measurements. I would like to know how I could bring down the pitch of the sound since currently its very high pitched or squeaky and then if it is still distorted how to resolve that issue if it exists.