Techniques such as ADPCM and LD-CELP have been created to compress the voice signal and reduce the number of ones and zeros needed for each PCM word.

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ADPCM (Adaptive Differential Pulse Code Modulation) and LD-CELP (Low-Delay Code Excited Linear Prediction) are techniques designed to compress voice signals, thereby reducing the bit rate required for digital representation compared to standard PCM (Pulse Code Modulation). This compression is achieved by encoding differences between samples or predicting future samples, rather than encoding the full sample values, effectively reducing the amount of data needed.

Techniques Such as ADPCM and LD-CELP Have Been Created to Compress