Question

Compair between delta modulation and adaptive delta modulation

Answer 1

Delta Modulation	Adaptive Delta modulation
It uses one bit for one sample	Only one bit is used to encode one sample
Step size is kept fixed and can not be varied	Step size is varied according to the signal variation
Slope-overload distortion & granular noise is present	Quantisation noise is present,but no other errors.
Lowest bandwith is enough	Lowest bandwith is enough
Signal to noise ratio is poor	Signal to noise ration is better than delta modulation
Bandwidth utilization is poor	Bandwidth utilization is superior than delta modulation
Step size is fixed,hence dynamic range is narrow.	Step size is variable,hence dynamic range is wider
Feedback exists in transmitter	Feedback exists