Y/C DUB color-under: Difference between revisions

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The DUB signal is typically carried on a [[Hirose 7-pin DUB]] connector on U-matic equipment and some professional VHS decks. Some time base correctors and transcoders (such as the [[Digital Processing Systems DPS-210]]) provide both [[Hirose 7-pin DUB]] connectors for direct VTR connection and [[BNC]] connectors with separate Y and C for flexible signal routing.

== Y/C-688 ==

'''Y/C-688''' is a common designation for U-matic color-under signal, referring specifically to the 688 kHz (more precisely 685.546 kHz) chrominance carrier frequency used by U-matic low-band decks. The name derives from the "Y/C" (luminance/chrominance) component separation combined with the nominal carrier frequency.

The term "Y/C-688" was used by some manufacturers and in professional documentation to distinguish U-matic DUB connections from standard S-Video (which uses a 3.58 MHz subcarrier for NTSC). The AMIA Cable Bible notes that Y/C-688 predates S-Video as a separated Y/C format, was first seen on 3/4" U-matic decks, and continued to be used on professional Betacam and VHS/S-VHS decks.<ref name="cable-bible">{{cite web |url=https://amiaopensource.github.io/cable-bible/#yc-688 |title=Y/C-688 ("Dub") |website=The Cable Bible |publisher=AMIA Open Source |access-date=2026-02-07}}</ref>

An important characteristic of Y/C-688 connections is that different devices modulated chrominance at different frequencies depending on the tape format—making signals from one Y/C-688-capable deck potentially incompatible with another, or with S-Video devices.<ref name="cable-bible" /> This is why the more general term "Y/C DUB color-under" is preferred when describing the signal type, as it encompasses all color-under frequencies without implying a specific modulation standard.

== See Also ==

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[[Category:Video signal formats]]

== References ==

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 The DUB signal is typically carried on a [[Hirose 7-pin DUB]] connector on U-matic equipment and some professional VHS decks. Some time base correctors and transcoders (such as the [[Digital Processing Systems DPS-210]]) provide both [[Hirose 7-pin DUB]] connectors for direct VTR connection and [[BNC]] connectors with separate Y and C for flexible signal routing.
+== Y/C-688 ==
+'''Y/C-688''' is a common designation for U-matic color-under signal, referring specifically to the 688 kHz (more precisely 685.546 kHz) chrominance carrier frequency used by U-matic low-band decks. The name derives from the "Y/C" (luminance/chrominance) component separation combined with the nominal carrier frequency.
+The term "Y/C-688" was used by some manufacturers and in professional documentation to distinguish U-matic DUB connections from standard S-Video (which uses a 3.58 MHz subcarrier for NTSC). The AMIA Cable Bible notes that Y/C-688 predates S-Video as a separated Y/C format, was first seen on 3/4" U-matic decks, and continued to be used on professional Betacam and VHS/S-VHS decks.<ref name="cable-bible">{{cite web |url=https://amiaopensource.github.io/cable-bible/#yc-688 |title=Y/C-688 ("Dub") |website=The Cable Bible |publisher=AMIA Open Source |access-date=2026-02-07}}</ref>
+An important characteristic of Y/C-688 connections is that different devices modulated chrominance at different frequencies depending on the tape format—making signals from one Y/C-688-capable deck potentially incompatible with another, or with S-Video devices.<ref name="cable-bible" /> This is why the more general term "Y/C DUB color-under" is preferred when describing the signal type, as it encompasses all color-under frequencies without implying a specific modulation standard.
 == See Also ==
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 [[Category:Video signal formats]]
+== References ==
+<references />