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  1. Member
    Join Date
    Mar 2014
    Location
    PALaland, Europe
    Search Comp PM
    Out of curiosity, what's the thin horizontal line we see in a VHS audio spectogram in upper part of both channels?
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  2. Originally Posted by kodec View Post
    Out of curiosity, what's the thin horizontal line we see in a VHS audio spectrogram in upper part of both channels?
    Picture please - i can imagine various lines in spectrogram - my first bet will be horizontal deflection frequency (for 50Hz systems this should be 15625Hz)
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  3. Member
    Join Date
    Mar 2014
    Location
    PALaland, Europe
    Search Comp PM
    Here it is. Yes, that's it. Why is it there?

    Click image for larger version

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  4. Dinosaur Supervisor KarMa's Avatar
    Join Date
    Jul 2015
    Location
    US
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    Yeah I've seen that too on VHS, both the mono linear track and on the stereo HiFi track. Also seen it on other tape based audio recordings. Not sure what it is.
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  5. It looks like the video's horizontal sync pulses leaking into the audio. As pandy pointed out 15625 (625 * 25) Hz for PAL. ~15734 (525 * 29.97) Hz for NTSC.
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