| 释义 |
phase signal relative to a time scale. Phase is measured in degrees (°), with a full oscillation expressed as 360°, as illustrated in Figure P-3. The phase of a signal can shift unintentionally, which causes signal distortion. Phase modulation (PM), more commonly known as phase-shift keying (PSK) is a signal modulation technique that modems often use to impress digital bits on an analog carrier. See also analog, carrier, digital, distortion, modulation, signal, PSK, and waveform. 90 0 180 360 270 90 0 180 360 270 |