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How to calculate the modulation depth of AM-DSB signal on USRP?

Hi, I use USRP for transmitting and receving signals. On the transmission part, the AM modualted signalt is U(t)=A*[1+k1*sin(x1*t)+k2*sin(x2*t)]*cos(xc*t), the modulation signal consists two sinusoidal signals with differfent frequencies. My questions are as follows : 1. On the received part, how to calculate the modulation depths of the two modualtion signals ? 2. What does the output "carrier amplitude" of MT Demodulate mean? Can it be used for calculating the modulation depth ? Thanks in advance.
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