In frequency division multiplexing communications, when the degree of multiplexing is high, group modulation is used, and several groups are further grouped together and group modulation is repeated. This hierarchical structure of multiplexing is called the FDM hierarchy. Multiplexing conversion devices are devices that perform group modulation according to this hierarchy. These include channel conversion devices that multiplex convert 12-channel voice into basic groups, group conversion devices that multiplex convert five basic groups, and similarly supergroup conversion devices, main group conversion devices, supermain group conversion devices, and giant group conversion devices. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
周波数分割多重通信において,多重度が大きい場合には群変調が用いられ,さらにいくつかの群をまとめて群変調を繰り返すことが行われる。この多重化の階層構成をFDMハイアラーキという。多重変換装置は,このハイアラーキに従って群変調を行う装置である。これらには12チャンネルの音声を基礎群に多重変換する通話路変換装置,五つの基礎群を多重変換する群変換装置,以下同様に,超群変換装置,主群変換装置,超主群変換装置,巨群変換装置がある。
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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