What is a minimum number of sampling frequency required to have distortion free reconstruction of a digital signal from its samples?

AF ADM system is designed to operate at 3 times the Nyquist rate for a signal with a 3 kHz bandwidth. The quantizing step size is 250 mV. *** (i) Determine the maximum amplitude of a 1-kHz input siinusoid for which the delta modulator does not show slope overload. (ii) Determine the posfiltered output part (i) signal-to-quantizing-noise ratio for the signal of

7. Why does PTM require a higher sampling frequency than PAM? a. The amplitude of PTM signals is constant. b. There are more sidebands in the first replica of a PTM c. Signal than in a PAM signal. d. A sample/hold circuit requires a higher sampling frequency. e. There are fewer sidebands in the first replica of a PTM signal f. Than in a PAM signal.

2. Define aliasing, and why it should be avoided? The spectrum of selected CT signal is given below. Draw the spectrum of the sampled signal with critical sampling, undersampling by 30%, and oversampling by 50%. Discuss the result. 1.0 -100 100 f (kHz)