In analog television, the luminance signal and the chrominance signals are transmitted in the same frequency range, but interleaved in frequency.
To ensure that these signals do not interfere with each other during display, the interleaved frequencies must be separated for display. This task is performed by a comb filter, Comb Filter. This is an analog filter whose blocking and passbands have many peaks, allowing the luminance signal to pass through such a comb filter and blocking the chrominance signals, or vice versa.
Comb filters improve the display of fine image details, clean up image edge transitions, and eliminate irrelevantcolors. Comb filters are also suitable for noise reduction and for spatial sound effects by raising and lowering different frequencies.