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Question :-

In traditional TDM equipment and Public Switched Telephone Network (PSTN) digital networking, which of the following was the first encoding method used to convert anal og station voice to digital transmission lines?
Pulse Code Modulation (PCM)
Adaptive Differential Pulse Code Modulation (ADPCM)
Code Excited Linear Prediction (CELP)
Algebraic Code Excited Linear Prediction (ACELP)

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