11 October 2007

Others

  • What is impulse response?
  • Explain the advantages and disadvantages of FIR filters compared to IIR counterparts.
  • What is CMRR?
  • Explain half-duplex and full-duplex communication?
  • Which range of signals is used for terrestrial transmission?
  • Why is there need for modulation?
  • Which type of modulation is used in TV transmission?
  • Why we use vestigial side band (VSB-C3F) transmission for picture?
  • When transmitting digital signals is it necessary to transmit some harmonics in addition to fundamental frequency?
  • For asynchronous transmission, is it necessary to supply some synchronizing pulses additionally or to supply or to supply start and stop bit?
  • BPFSK is more efficient than BFSK in presence of noise. Why?
  • What is meant by pre-emphasis and de-emphasis?
  • Explain 3 dB cutoff frequency? Why is it 3 dB, not 1 dB?
  • Explain ASCII, EBCDIC?

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