Pulse Amplitude Modulation Modulation scheme where the modulating wave is caused to modulate the amplitude of a pulse stream Compare with AM and FM See also modulation
Pluggable Authentication Modules PAM is an authentication system that controls access to Red Hat Linux
Pulse Amplitude Modulation is a process which represents a continuous analog signal with a series of discrete analog samples This is the basis of PCM and T-1
Percent Accepted Mutation A unit introduced by Dayhoff et al to quantify the amount of evolutionary change in a protein sequence 1 0 PAM unit, is the amount of evolution which will change, on average, 1% of amino acids in a protein sequence A PAM(x) substitution matrix is a look-up table in which scores for each amino acid substitution have been calculated based on the frequency of that substitution in closely related proteins that have experienced a certain amount (x) of evolutionary divergence
An abbreviation for Pulse Amplitude Modulation In the first part of the A/D conversion, pulses occurring at the sampling frequency are modulated by an analog audio signal See also PCM
pulse amplitude modulation Modulation scheme where a continuous analog signal is represented with a series of discrete analog samples, which are then recreated as a complete signal Sampling allows several signals to be combined on a channel that would otherwise carry only one signal Compare with AM and FM See also modulation
(Pluggable Authentication Modules) - A replaceable user authentication module for system security, which allows programs to be written without knowing which authentication scheme will be used This allows a module to be replaced later with a different module without requiring rewriting the software