US 7,502,951 B2
Adjustment system and method for automatically adjusting the gain of a voltage signal
Satoshi Sakurai, Shinagawa (Japan); and Hiroto Inoue, Shinagawa (Japan)
Assigned to Fujitsu Component Limited, Tokyo (Japan)
Filed on Mar. 25, 2005, as Appl. No. 11/89,308.
Claims priority of application No. 2004-092173 (JP), filed on Mar. 26, 2004.
Prior Publication US 2005/0213749 A1, Sep. 29, 2005
Int. Cl. G06F 1/26 (2006.01); G06F 11/30 (2006.01)
U.S. Cl. 713—340  [363/149; 327/50] 16 Claims
OG exemplary drawing
 
1. An automatic adjustment system having a cable insertion/pull-out sensing unit, comprising:
a transmission device including a constant voltage output unit outputting a constant-voltage signal to a cable; and
a reception device including a voltage detecting unit and a control unit, the voltage detecting unit receiving the constant-voltage signal transmitted through the cable and detecting the voltage of the constant-voltage signal, the control unit determining signal attenuation based on a voltage detected by the voltage detecting unit and adjusting a gain of a receiving unit receiving the constant-voltage signal from the transmission device upon detecting, by the cable insertion/pull-out sensing unit, a connection of the cable to a connector without requiring a powering on after the connection.