The Modula programming language is a descendant of the Pascal programming language. It was developed in Switzerland in the 1970s by Niklaus Wirth, the same person who designed Pascal.
Phase-shift keying (PSK) is a method of digital communication in which the phase of a transmitted signal is varied to convey information. There are several methods that can be used to accomplish PSK. The simplest PSK technique is called binary phase-shift keying (BPSK). It uses two opposite signal phases (0 and 180 degrees).