Standard frequency time signals

Japanese: 標準電波報時 - ひょうじゅんでんぱほうじ(英語表記)standard frequency time signals
Standard frequency time signals
A radio signal to provide a standard for frequency and time. The mainstream format is to continuously transmit standard frequency radio waves in the so-called 5MHz series, such as 2.5, 5, 10, or 15MHz, with a signal added every second, but some use frequencies other than the 5MHz series, and some transmit at fixed intervals rather than continuously. The second signal in the 5MHz series standard radio signal is displayed by modulating an audio frequency (1000, 1200, 1600 Hz, etc.) for 5 milliseconds, as recommended by the International Consultative Committee for Radiocommunication (CCIR).

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
周波数および時刻の標準を与えるための電波報時。2.5,5,10,15MHzなどいわゆる5MHz系列の標準周波数電波を連続発射し,これに毎秒信号を載せた形式のものが主流であるが,一部には5MHz系列以外の周波数を使っているものや連続でなく定時発射のものなどもある。5MHz系列の標準電波報時の秒信号は,国際無線通信諮問委員会(CCIR)の勧告により5ミリ秒間の音声周波数(1000,1200,1600Hzなど)の変調によって表示されている。

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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