Digital Communication Review of Unit 1 and 2

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The modulation techniques used to convert analog signal into digital signal are

• Pulse code modulation

• Delta modulation

• Adaptive delta modulation

• All of the above

In Delta modulation

• One bit per sample is transmitted

• All the coded bits used for sampling are transmitted

• The step size is fixed

• Both a and c are correct

The sequence of operations in which PCM is done is

• Sampling, quantizing, encoding

• Quantizing, encoding, sampling

• Quantizing, sampling, encoding

• None of the above

In Differential Pulse Code Modulation techniques, the decoding is performed by

• Accumulator

• Sample

• PLL

• Quantizer

Granular noise occurs when

• Step size is too small

• Step size is too large

• There is interference from the adjacent channel

• Bandwidth is too large

The digital modulation technique in which the step size is varied according to the variation in the slope of the input is called

• Delta modulation

• PCM

• Adaptive delta modulation

• PAM

In Adaptive Delta Modulation, the slope error reduces and

• Quantization error decreases

• Quantization error increases

• Quantization error remains same

• None of the above

The process of coding multiplexer output into electrical pulses or waveforms for transmission is called

• Line coding

• Amplitude modulation

• FSK

• Filtering

Scrambling of data is

• Removing long strings of 1’s and 0’s

• Exchanging of data

• Transmission of digital data

• All of the above