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Python programming about the Fourier transform signal and Amplitude modulation.

alt="屏幕快照 2019-09-23 下午3.07.55.png" />

屏幕快照 2019-09-23 下午3.07.55.png

Given a message consists of two triangles:
m(t) = A(
t + 0.01
0.01
- 4
t - 0.01
0.01
The modulation and demodulation process of the double sideband-suppressed carrier (DSB-
SC) can be described in Figure 5, in which, the frequency fc of the sinusoidal carrier wave c(t) =
cos(27 fet) is 500H z. The low-pass filter at the demodulator has a bandwidth of 150Hz. Use Python
to sketch m(t) and the signals at point a, b and c in time domain and frequency domain.
cos(27 fet)
m(t)
a
b
C
LPF
m' ( t )
cos(27 fet)

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