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2. Analog Protection System - Wikipedia

   en.wikipedia.org/wiki/Analog_Protection_System

   Another form of analog copy protection, known as CGMS-A, is added by DVD players and digital cable/satellite boxes. While not invented by Macrovision, the company's products implemented it. CGMS-A consists of a "flag" within the vertical blanking interval (essentially data, like closed captioning) which digital recording devices search for.

3. Helical scan - Wikipedia

   en.wikipedia.org/wiki/Helical_scan

   M wrap, used in VHS and the D-1 (Sony) and D-2 (video) digital videotape formats, wraps the tape around the head drum in a pattern or in a tape path reminiscent of the letter M, around the left and right side of the head drum, 250 to 300 degrees around it where 180 to 270 degrees are active or used for recording, with two heads if 180 degrees ...

4. Videocassette recorder - Wikipedia

   en.wikipedia.org/wiki/Videocassette_recorder

   A typical late-model Philips Magnavox, VHS format VCR A close-up process of how the magnetic tape in a VHS cassette is being pulled from the cassette shell to the head drum of the VCR A videocassette recorder ( VCR ) or video recorder is an electromechanical device that records analog audio and analog video from broadcast television or other AV ...

5. Video tape tracking - Wikipedia

   en.wikipedia.org/wiki/Video_tape_tracking

   In the case of VHS, a linear control track at the tape's lower edge holds pulses that mark the beginning of every frame of video; these are used to fine-tune the tape speed during playback and to get the rotating heads exactly on their helical tracks rather than having them end up somewhere between two adjacent tracks. However, the exact ...

6. What your VHS tapes are worth now - AOL

   www.aol.com/news/2016-04-05-what-your-vhs-tapes...

   Before you decide to dig up those old VHS tapes, however, here's a list of the some of the most valuable types of tapes (and how much they're going for): More from AOL.com: What your barbies are ...

7. D-1 (Sony) - Wikipedia

   en.wikipedia.org/wiki/D-1_(Sony)

   D-1 or 4:2:2 D-1 (1986) was a major feat in real time, broadcast quality digital video recording. It stores uncompressed digitized component video, encoded at Y'CbCr 4:2:2 using the CCIR 601 raster format with 8 bits, [1] [2] along with PCM audio tracks as well as timecode on a 3/4 inch (19 mm) videocassette tape (though not to be confused with the ubiquitous 3/4-inch U-Matic/U-Matic SP cassette).