Intercarrier method: Difference between revisions

Revision as of 08:02, 18 May 2010

Revision as of 15:19, 21 July 2010

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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, p 469.</ref> (It should be noted that althoughAlthough 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==