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Explain why a 1 3 - bit analogue - to digital - convertor ( ADC ) is often used in pulse code modulation ( PCM

Explain why a

13 -

bit analogue

-

to digital

-

convertor

(

ADC

)

is often used in pulse code modulation

(

PCM

)

when only

8 -

bits are transmitted.

(2

marks

)

.

Following compression in PCM

,

how and why is an inverter used?

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