| |
Plug-in computer card with internal audio speaker element - Patent 5790897 (Site not responding. Last check: 2007-10-29) |
 | | This type of jack receptacle and jack plug, which generates a digital output signal, is to be contrasted with jack receptacles and jack plugs that operate with a mechanical switch to cut out an internal circuit when the jack plug is plugged in. |
 | | In jack units utilizing a mechanical switch, the incoming signal is connected to connector pins in the jack receptacle that lead to an internal speaker, when the jack plug is not inserted into the jack receptacle. |
 | | When a jack plug is inserted into the jack receptacle, the contacts to the internal speaker are mechanically opened and the audio signal feeds exclusively to the jack plug, disabling the internal speaker. |
| www.freepatentsonline.com /5790897.html (4118 words) |