Digital Communication 4 and 5

Pulse Code Modulation does not include

• Sampling

• Compression

• Quantization

• Encoding

One bit Quantization

• Pulse Code Modulation

• Differential PCM

• Delta Modulation

• Pulse width Modulation

Drawbacks of Delta Modulation

• Slope overload distortion

• Granular Noise

• Bandwidth

• both a and B

Quantization noise can be reduced by ________ the number of levels.

• Increasing

• Decreasing

• Doubling

• Squaring

DPCM encodes the PCM values based on

• Quantization level

• Difference between the current and predicted value
  

• Interval between levels

• None of the mentioned

Matched filter

• Decrease SNR

• Increase SNR

• Reduce Noise

• Increase ISI

The method in which the tail of one pulse smears into adjacent symbol interval is called as

• Inter channel interference

• interbit interference

• interdata interference

• intersymbol interference

Which is on - off keying

• ASK

• FSK

• PSK

• ALL the above

QPSK is a modulation scheme where each symbol consists of

• 1 bit

• 2 bits

• 3 bits

• 4 bits

In Binary Phase Shift Keying system, the binary symbols 1 and 0 are represented by carrier with phase shift of ____ degrees

• 0

• 90

• 180

• 270