…On the other hand, when the modulating signal is digital, phase modulation is quite different from frequency modulation. Digital phase modulation is called PSK (short for phase shift keying), and is called 2-phase when the modulating signal is 2-value, 4-phase when it is 4-value, and 8-phase when it is 8-value. In the case of 2-phase, 1 bit can be sent, in the case of 4-phase, 2 bits can be sent, and in the case of 8-phase, 3 bits can be sent per modulation time interval (time slot). … *Some terminology explanations that mention "phase shift keying" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…一方,変調信号がディジタルである場合,位相変調は,周波数変調とかなり異なったものである。ディジタル位相変調は,PSK(phase shift keyingの略)と呼ばれ,変調信号が2値の場合2相,4値の場合4相,8値の場合8相という。1変調時間間隔(タイムスロット)当り,2相の場合は1ビット,4相の場合は2ビット,8相の場合は3ビット送れることになる。… ※「phase shift keying」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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