____________ is used by IM and other applications that provide voice services over lower-speed digital circuits.
pulse code modulationb.
adaptive differential pulse code modulationc.
Voice conversationd
code modulatione.
phase modulation

Respuesta :

Answer:

The correct answer is Adaptive differential pulse code modulation

Explanation:

Adaptive differential pulse code modulation (ADPCM) is a variant of differential pulse-code modulation (DPCM) that varies the size of the quantization step, to allow further reduction of the required data bandwidth for a given signal-to-noise ratio. The output data rate can be dynamically adjusted between 16 kbit/s and 64 kbit/s in these applications.