The message signal to be transmitted is f(t) = 10cos(2π1000t) + 5cos(2π2500t) + 8cos(2π5000t), carrier signal  fc(t)= cos(2π10000t) with fTYB(t) = f(t) f(c) + f''(t) f''c(t) It is transmitted by modulating. f''(t) denotes the hilbert function. a) Find the time domain and frequency domain representation fTYB (t) and FTYB (t) of the modular signal. b) Draw the Frequency Spectrum.

Select the correct statement(s) regarding amplitude modulation (AM).     a.  If the AM Index is greater than 1 (i.e., µAM>1), then over modulation occurs leading to signal distortion     b.  With AM, the message is captured as amplitude changes to the carrier’s amplitude

A PCM communication system has 4 codewords: 00, 01, 10, 11; the first two are for positive voltages, the second two are for negative voltages. These are arranged in the way we have become used to seeing them arranged: the larger the binary number the larger the *magnitude* of the signal. The gap between codewords is 1 volt. No codeword gap straddles the 0 volts value. A square wave has a fundamental frequency of 1Hz. It has the value +2volts at t=0. It has a maximum value of 2 volts, and a minimum value of -2 volts. It is sampled at 1Hz. What is the resulting sequence of the magnitude of the quantisation errors in the codewords?

q15

digital communication

Here are the last parts of the question I asked previously. I forgot to specifiy that in the previous posting :) A digital communication link carries binary-coded words representing samples of an input signal,                                        xa(t)=3cos⁡(600πt)+2cos⁡(1800πt)   (d) Will there be any aliasing here?   (e) Which frequency will alias to what frequency

What is the resulting signal of the following Hartley SSB modulator? + sin 2πfct m(t). -π/2 a. The LSSB signal. O b. The inverted LSSB signal. c. The inverted USSB signal. O d. The USSB signal. + сos 2πfct

Q5