A high rate of occurrence of any regularly repeated event, so that the interval between successive events is correspondingly small; (Physics, etc.)…

A low rate of recurrence of any regularly repeated event, so that the interval between successive events is correspondingly large; (Telecommunications…

a frequency within the range required for the transmission of speech (commonly taken as 200 or 300 Hz to 3000 Hz or higher).

a frequency between about 20 and 20,000 hertz, which for sound is within the range of audibility; a signal of this frequency; frequently attributive…

The angular frequency of a periodic motion, i.e. 2π times its actual frequency.

an intermediate frequency (of oscillation); (Telecommunications) a frequency of a medium wave, between 300 and 3000 kilohertz.

a particular frequency in a sideband (sideband, n. 2); a harmonic.

the frequency to which an incoming carrier wave is converted by the frequency changer of a superheterodyne receiver; abbreviated I.F. n. at I, n.1…

The low-frequency component of (esp. transmitted or reproduced) sound. Frequently attributive. Cf. treble, n. compounds.

Physics, etc. The rate of recurrence of any regularly repeated event, e.g. a vibration; the number of times that it occurs in a second or other…

the entire range of frequencies of electromagnetic waves, sound waves, etc.; also, the distribution of the energy of a wave-form among its…