Pulse-amplitude modulation

The pulse amplitude modulation (PAM) is an analog modulation method. In pulse amplitude modulation, the amplitude of the signal at specific time intervals ( time slots ) are removed individual "samples"; the signal is sampled. The information content lies at a PAM signal in the height of each pulse. This height corresponds to the information available at the time of sampling the amplitude of the signal voltage. The PAM signal is discrete in time and continuous values ​​.

The pulse amplitude modulation is suitable for communication systems with time division, as in the time between the individual pulses of a communication channel PAM PAM pulses in other channels can be transmitted. PAM is due to the high susceptibility rather than transfer over long distances. The pulse height is too strongly influenced by the characteristics of the transmission path, so that a false signal arrives at the receiver side. PAM was used to some extent in older telephone systems.

The pulse amplitude modulation is the precursor to the pulse code modulation (PCM). In the PCM addition, the amplitude values ​​of the PAM are quantized, that is, converted into a discrete-value result. This time and value discrete signal sequence is called a digital signal.

Overview: Modulator

AM | FM | PM | VM | SSB | SSBSC | DSBSC

ASK | G | GFSK | QPSK | QAM | OFDM | DMT | TCM | VSB

PWM | PAM | PFM | PPM (1) | PPM (2) | PCM

• Modulation (technology)