Audio apparatus of negative driving with adaptive gain control

Details Audio apparatus of negative driving with adaptive gain control Audio apparatus of negative driving with adaptive gain control

2005-12-13

2005-12-13

Chin, Vivian (Department: 2644)

Electrical audio signal processing systems and devices

With amplifier

Feedback

C381S120000, C381S096000, C381S055000, C330S112000, C330S085000, C330S102000

Reexamination Certificate

active

06975734

ABSTRACT:
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.

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