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What are the applications of delta modulation?

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Probably the most common application is the variant, delta-sigma modulation used in high resolution A/D and D/A converters.
 
It was used by several PBX manufacturers before PCM became the standard. Its positive was the ability to encode any voltage and its negative was its limited dynamic range. A fast changing input could out run the thing. In telephone systems that have a 3.5k bandwidth limit, that was not really an issue.
 
Have you tried this one yet?
 
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