…Part of APK is also called QAM (quadrature amplitude modulation). Amplitude modulation when the carrier wave is a pulse train is called pulse amplitude modulation (PAM). When the modulating signal is an analog signal, the waveform is as shown in Figure b. … From [Multiplex communication]…Therefore, for telephone signals with a bandwidth of 0.3 to 3.4 kHz, communication is possible by transmitting sampled values sampled at, for example, 2 f 0 = 8 kHz ( T 0 = 125 μs). This method of sampling a continuous signal and transmitting the sampled values as the amplitude (height) of a pulse is called pulse amplitude modulation (PAM) and is a representative pulse modulation method. The basic idea of time division multiplexing is to arrange the sampled value sequences of multiple signals so that they do not overlap each other in time, and transmit them simultaneously over a single transmission line. … *Some of the terminology that refers to "pulse amplitude modulation" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…APKの一部をQAM(quadrature amplitude modulationの略)ともいう。搬送波がパルス列の場合の振幅変調は,パルス振幅変調pulse amplitude modulation(PAM)という。変調信号がアナログ信号の場合の波形は,図のbのようになる。… 【多重通信】より…したがって,0.3~3.4kHzの帯域を有する電話信号においては,例えば2f0=8kHz(T0=125μs)で標本化した標本値を伝送することによって通信が可能である。このように,連続信号を標本化し,その標本値をパルスの振幅(高さ)として伝送する方式は,パルス振幅変調pulse amplitude modulation(PAM)方式と呼ばれ,パルス変調方式の代表的なものである。時分割多重化の基本的な考え方は,多数の信号の標本値列を時間的に互いに重ならないように配置して,一つの伝送路を介して同時に伝送しようとするものである。… ※「pulse amplitude modulation」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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