CEA-109-D规定了标准广播（AM）、调频和电视广播接收机中使用的中频（IFs）。在CEA-109-D中，术语中频（IF）指接收机前端的主要干扰抑制和通带成形电路。

CEA-109-D specifies Intermediate Frequencies (IFs) to be used in Standard Broadcast (AM), FM, and TV broadcast receivers. In CEA-109-D, the term Intermediate Frequency (IF) refers to the dominant interference-rejecting and passband-shaping circuits in receiver front-ends.