1. Humans can hear sounds at frequencies between 0 and 22.05 kHz. What minimum sampling rate should be choosen to permit perfect recovery from samples?
2. Determine the Nyquist sampling rate for each of the following analog signals:
a. x(t)=cos(20t+12deg.)
b. xx(t)=2sin(5000pi t/3)
c. x(t)=sin(3000pi t/7)
3. A voice signal is sampled at 8000 samples per second.
a. What is the time between samples?
b. What is the maximum frequecy that will be recovered from the signal?
4. A cell phone transmits voice signals on a carrier. the transmissions lie inbetween 900MHz to 900.03MHz. What minimum sampling rate should be choosen so that the transmisions will be recoverable from the digital samles?
5. Voltages between -3V and +3V must be digitized. Find the Quatization step size when samples are quatized using:
a. 4 bits
b. 8 bits
c. 16 bits
6. How many digital codes can be prodced by an A/D converter using:
a. 8 bits
b. 10 bits
c. 12 bits