| 摘要 |
In the present invention, a transmission cable category is cheaply and easily discerned. By applying a predetermined voltage to a predetermined pin in a receptacle that has a plurality of pins for connecting a transmission cable plug, the transmission cable category is discerned. A new HDMI cable has a resistor connected between the predetermined pin in the plug and a shield shell. When a voltage is applied, the fact that the cable is a new HDMI cable is discerned by detecting the current flow. Conventional HDMI cables do not have a resistor between a predetermined pin in the plug and a shield shell, and therefore no current flows when a voltage is applied. |
