| 摘要 |
Disclosed is an apparatus for detecting the type of an audio interface. The apparatus includes: an audio interface, an electric level comparison module A, an electric level comparison module B, wherein pin 3 and pin 4 are connected with the electric level comparison module A and B. The electric level comparison module A outputs signal Sg1 at output port when electric level V3 of pin 3 is greater than the sum of electric level V4 of pin 4 and pre-determined threshold Vg1, otherwise outputs signal Sg1'. The electric level comparison module B outputs signal Sg2 at output port when electric level V4 of pin 4 is greater than the sum of electric level V3 of pin 3 and pre-determined threshold Vg2, otherwise outputs signal Sg2'. The signal Sg1 is different from the signal Sg1'. The signal Sg2 is different from the signal Sg2'. The threshold Vg1 and Vg2 are greater than or equal to 0. It's convenient to detect and recognize the type of audio interface of the audio device which is connected with the apparatus for detecting the type of an audio interface. |
