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• At receiver, the signal can be approximately reconstructed as | • At receiver, the signal can be approximately reconstructed as | ||
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• Two types of distortions: slope-overload distortion and granular noise | • Two types of distortions: slope-overload distortion and granular noise | ||
Revision as of 23:23, 2 December 2017
• Delta modulation
Another practical analog-to-digital conversion technique is delta modulation, whose output is a binary bit sequence, each consisting of either 0 or 1.
• Delta modulator at transmitter
• At receiver, the signal can be approximately reconstructed as
• Two types of distortions: slope-overload distortion and granular noise
• To avoid slope-overload distortion, we need to have
• On the other hand, to reduce granular noise, it is desirable to have smaller ∆
• Thus, there is a trade-off in selecting large or small step size ∆ to balance between minimizing slope-overload distortion and granular noise
• One solution is to reduce 𝑇𝑇𝑠𝑠, but this increases transmission rate
