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{{main|Television set}}
In TV receivers, the received radio frequency signal is converted to IF in tuner and then demodulated. The output of the demodulator consists of a VF and an aural signal which is in fact an FM subcarrier modulated by AF. (The subcarrier is 5.5 MHz. in [[system B]] and 4.5 MHz. in [[system M]] ) The aural signal and the VF are separated by a simple filter. The only extra stage needed for AF (other than the [[loudspeaker]]) is an [[Demodulation|FM demodulator]].<ref> Bernard Grob,Charles E.Herndon:''Basic Television and Video Systems'',Glencoe,McGraw Hill,New York,6th ed,1999,pp 469 </ref> (It should be noted that although AF VF signals are combined in the IF stages of the transmitters, they are separated in baseband stages of the receivers.)
== Intermodulation products and notch filters==
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