A frequency to which a signal is converted for ease of handling. Receives its name from the fact that it is an intermediate step between the initial and final conversion or detection stages.
The signal obtained by heterodyning two signals of different frequencies. In superheterodyne receivers, the intermediate frequency is the difference between the incoming signal frequency and the local oscillator frequency.
In receivers, that frequency to which a selected incoming signal is converted by heterodyne with the local oscillator signal to which the remaining circuits of the receiver can be precisely tuned regardless of the frequency of the desired incoming signal.