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Termyn8or -> RE: Electronics genius-es--es-es (8/19/2007 3:26:42 AM)
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Ron;
There are several ways around this. How much electornics do you know ?
You could do what I did a while back and use beta. My SL-HFR60 and HFP100 records video better than any VHS and audio better than a CD. It has no problem with macrovision, However it reproduces the macrovision just fine and if you try to dub it to VHS the usual happens.
They seem to have taken all the macro scruibbers off the market. One can be built relatively easily, especially if you can tp the head switching pulse in the playing VCR, but then this is not available on a DVD. At any rate, if you clamp the video to blsck level during vertical retrace you'll foil most macrovision.
Another scheme would be to clamp the input gain of the recording VCR. VHS compresses the video, not in the digital sense, in the dynamic range. The macrovision pulses during vertical retrace fools the recording device into thinking it is recording at too high a level. Modern VCRs use RMS as well as peak delection to hold the recording modulation to the "right" level, and this is how macrovision fools it. By putting white blocks in the vertical retrace up to 100 IRE, it makes it turn down the level until sync is suppressed enough to make the monitor roll vertically, and possibly for the recording VCR to lose head sync.
The reason my beta doesn't have a problem is that it does not use RMS detction, simply peak detection. The level does not change because it is already set by the white burst in the VITS, or VIR signal, also in the vertical retrace interval. Since the macrovision does not exceed 100 IRE, it doesn't bother the beta at all. All VHS machines have used RMS detection, and the newer betas did as well. That is presicely how it works.
There has got to be a macro scrubber out there used for sale, unless nobody wants to give them up. They were sold legally because macrovision did screw with some of the older TV's video processing. Later, a few were sold because some people had to watch DVD through their VCRs. However they dropped the other shoe and started selling modulators. This does not help.
If there are no macro scrubbers for sale, surely online you can get plans, or possibly even a kit to build one. I think big money has actually gotten sales of new, effective macroscrubbers illegalized.
I know one or two people who have macroscrubbers but they'll never sell them. How are you at kit building ? If you get plans for one, I can look at the schematic and tell you if the thing is going to work, usually. I have also designed an analog one, which should work, but may cut off the closed caption and even the top of the picture if not adjusted properly. But do we care ?
T
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