| 释义 |
standard-frequency signal standard-frequency signal[′stan·dərd ¦frē·kwən·sē ‚sig·nəl] (communications) One of the highly accurate signals broadcast by government radio stations and used for testing and calibrating radio equipment all over the world; in the United States signals are broadcast by the National Bureau of Standards' radio stations WWV, WWVH, WWVB, and WWVL. |