Why has the PCM sampling time beenset at 125 microseconds?

Answer Explanation:c

PCM (pulse code modulation) is a process for transmitting the analog data from one place to other place the signal which are used in pulse code modulation are binary that is only 0 and 1 using PCM all forms of analog data can be form including voice music etc.

to obtain pcm an analog signal is sampled at regular time interval the sampling rate is very high as compared to the frequency used by analog signal. the instant amplitude of analog signal at each sampling is being closer to the nearest several specific earlier levels. this process is called tantalization. in this the number of level is power of 2 so the sampling time is set as 125 microseconds.