in bandpass filter create a simple analog signal and label it with 300 to 3khz.

PCM Transmitter Men Analog 2 PAM Parallel data 2 Input Signal Bandpass filter Sample and hold Analog-to- digital converter Parallel-to- serial converter Sample pulse Conversion clock Line speed clock Serial PCM code Serial PCM code Serial PCM code Regenerative repeater Regenerative repeater Parallel data Mn PAM Analog Serial-to- parallel converter Digital-to- analog converter H Hold circuit Output Low-pass filter signal 2 Line speed clock Conversion clock PCM Transmitter Men Analog 2 PAM Parallel data 2 Input Signal Bandpass filter Sample and hold Analog-to- digital converter Parallel-to- serial converter Sample pulse Conversion clock Line speed clock Serial PCM code Serial PCM code Serial PCM code Regenerative repeater Regenerative repeater Parallel data Mn PAM Analog Serial-to- parallel converter Digital-to- analog converter H Hold circuit Output Low-pass filter signal 2 Line speed clock Conversion clock