专利检索 ap:("YAMAHA CORPORATION") AND inv:"Suzuki, Eiichi, c/o Yamaha Corp." 第 1 页

1.

发明授权
Audio apparatus of negative impedance driving with adaptive gain control 有权
标题翻译：音频设备具有负阻抗驱动器电路和自适应增益控制

公开(公告)号：EP1014571B1

公开(公告)日：2009-02-25

申请号：EP99125664.5

申请日：1999-12-22

申请人： YAMAHA CORPORATION

发明人： Suzuki, Eiichi, c/o Yamaha Corp.

IPC分类号： H03G5/22

CPC分类号： H03G5/22 , H04R3/00

2.

发明公开
Audio apparatus of negative impedance driving with adaptive gain control 有权
标题翻译：音频设备具有负阻抗驱动器电路和自适应增益控制

公开(公告)号：EP1014571A2

公开(公告)日：2000-06-28

申请号：EP99125664.5

申请日：1999-12-22

申请人： YAMAHA CORPORATION

发明人： Suzuki, Eiichi, c/o Yamaha Corp.

IPC分类号： H03G5/22

CPC分类号： H03G5/22 , H04R3/00

摘要： An audio apparatus is constructed for use in negative drive of a loudspeaker having an internal impedance to perform a desired amplitude-frequency characteristic. In the audio apparatus, an amplifier device drives the loudspeaker with a driving voltage. A feedback device performs a positive feedback of a signal corresponding to the driving voltage of the loudspeaker to the amplifier device with a variable feedback gain, thereby causing the amplifier device to generate a negative impedance effective to negate the internal impedance of the loudspeaker. An adjustment device decreases the variable feedback gain of the feedback device as a level of the driving voltage of the loudspeaker increases, thereby adjusting the amplitude-frequency characteristic of the amplifier device.