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  1. 8th Nov 2016 12:34 #1
    kodec
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    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. 8th Nov 2016 12:47 #2
    pandy
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    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. 8th Nov 2016 13:06 #3
    kodec
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    Here it is. Yes, that's it. Why is it there?

    Click image for larger version Name: ama2.png Views: 199 Size: 256.5 KB ID: 39362
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  4. 8th Nov 2016 17:28 #4
    KarMa
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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. 8th Nov 2016 17:33 #5
    jagabo
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    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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