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Delta modulation slope overloading

I have a question about a problem in a textbook I can't exactly solve. It goes as follow: Given a message m(t) as input to a DM system $$ m(t) = 3cos(890\pi t) - 0.7sin(1000\sqrt{3}t) $$ Determine ...
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Delta Modulation Frequency in the Integrator

Ok guys, I can't understand a thing, I have made this circuit, that is a delta modulator: As you can see with an input of 5Vpp, in the output of the integrator I found a square wave signal, that has ...