This is principle telecommun class Use this book for more information Analog and

Question

This is principle telecommun class Use this book for more information Analog and digital communication systems by Martin S. Roden
The questions are: 16. Barker codes are employed in: a) AM modulation. b) frame synchronization. c) companding. d) compression.
17. For many decades, television transmission employed: a) DSB. b) SSB. c) VSB.
18. A key component of a superheterodyne receiver is a(n) a) VCO. b) PLL. c) D flip flop. d) varactor. e)local oscillator.
19. In TDM and FDM, the letter M represents to:
20. As compared to NRZ, bi-phase assures a) no dc component transmitted. b) improved clock recovery. c) both a) and b 16. Barker codes are employed in 17. For many decades, television transmission employed 18. A key component of a superheterodyne receiver is a(n) 19. In TDM and FDM, the letter M represents 20. As compared to NRz, bi-phase assures

Explanation / Answer

16. D

A Barker code is a string of digits of length such that. for all . Barker codes are used for pulse compression of radar signals.

17. DSB

Double sideband (DSB) modulation signal, is used for many decades for Television signal transmission.

18. E

The LO (Local Oscillator) tunes the radio in superheterodyne receivers so that the desired input frequency passes through the IF filters.

19. Multiplexing.

TDM - Time Division Multiplexing

FDM - Frequency Division Multiplexing

20. C

No dc component will be transmitted and improved clock recovery.

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