Connector device for information-handling apparatus and connector device for stereophonic audio/video apparatus

A connector device for connecting information-handling apparatuses, comprising:

• a common jack for selectively connecting, to a first stereo audio/video apparatus comprising first and second stereo audio devices having respective different first and second impedances and a first video device, a third stereo audio device having an impedance which is substantially equal to said first impedance, and a second stereo audio/video apparatus comprising a fourth stereo audio device having an impedance which is substantially equal to said second impedance, and a second video device, said common jack being mounted on said first stereo audio/video apparatus;
• a first plug mounted on said third stereo audio device and for connection to said common jack;
• a second plug mounted on said second stereo audio/video apparatus and for connection to said common jack;
• said first plug being connected to left and right audio signal terminals of said fourth stereo audio device and a video signal terminal of said second video device;
• said first plug having one of a left and right audio signal contact, one of a right and left audio signal contact, and a ground contact arranged successively from a tip end thereof;
• said second plug having one of a left and right audio signal contact, a video signal contact, a ground contact, and one of a right and left audio signal contact arranged successively from a tip end thereof;
• and
• plug determining means connected to said common jack for determining, when one of said first and second plugs is connected to said common jack, whether an impedance between a first contact, as counted from a tip end of one of said first and second plugs, and a ground contact of one of said first and second plugs is one of said first impedance and said second impedance so as to determine whether a plug connected to said common jack is one of said first and second plugs, energizing said first stereo audio device if said plug connected to said common jack is said first plug, and energizing said second stereo audio device and said first video device if said plug connected to said common jack is said second plug.