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Lossy or Lossless? Please use this forum to post spectral and frequency analysis posts about shows you have your doubts about.

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Old 2005-03-18, 06:23 PM
wazoo2u wazoo2u is offline
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Re: Line at 15.5 on Spectral View - sourced from ?

Found this...

Date: Wed, 17 Nov 1993 14:03:00 EDT
Subject: Re: VCR/VHS for Mastering?

VHS HiFi, compares very favorably to 1/4" half-track 15ips analog tape with
dBx-I processing in all but one spec. Because of the modulation process
involved with getting the audio signal into the helical video signal, a low
level high frequency buzz is generated. It is down pretty low and is masked
by almost any audio signal, but it is there and it does rear its head when,
for example, dead space occurs. At any rate, the buzz floor is a lot lower
than any cassette noise floor, and as a recording medium VHS-HiFi is very
much suoerior to any analog cassette format.


The more I read, it appears that this is an ARTIFACT that shows up in VHS-HI-FI recordings.

If you look at the original CAP, you'll see that the frequency response extends well beyond FM, to at least 20kHz. I'm now interpreting that the recording was from a VHS-HIFI transfer, but not necessarily from "TV".

You'll probably see a lot of these because it's common for people to hook up their VHS-HIFI to a tuner and record a broadcast using the VCR timer.

I'm still trying to find out WHY this artifact shows up, and what causes it exactly.
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Old 2005-03-19, 08:04 PM
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Five Five is offline
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Re: Line at 15.5 on Spectral View - sourced from ?

what would really be useful is to find out if it is possible to prevent it during recording/playback.

does anybody have some real world experience with this?
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Old 2005-08-23, 01:35 PM
mokura mokura is offline
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Re: Line at 15.5 on Spectral View - sourced from ?

I came across this tread after searching the site for some information. I too have experienced the solid red lines going across the entire spectral view, except that I am transfering cassette tapes. This happens to ALL cassettes I transfer, cassette > stand alone CD and cassette > HD (.wav). [All cassettes were received from various sources.]

I had others transfer the same material and the spectral view from these other transfers do not show the red line. I gather that something is wrong with my setup, either my cassette deck, receiver, or a cable problem. Nothing I try seems to correct my problem. Has anybody had a similar problem before? Can anybody provide suggestions or pointers? This problem makes me feel like a newbie again. Thanks.
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The Traders' Den > Where we go to learn ..... > Technobabble > Lossy or Lossless?

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