Acoustic apparatus
December 27, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2887532 3037081 3590284 3657480 Loudspeaker lower bass response using negative resistance and impedance loading Acoustic monolithic power semiconductor integrated circuit and acoustic system using the same Tone control of the operational type Fixed bandpass tone controlling Loudspeaker system with combination crossover and equalizer Electro-acoustic converter with compensated frequency response characteristic InventorAssigneeApplicationNo. 634606 filed on 12/27/1990US Classes:381/98, INCLUDING FREQUENCY CONTROL381/96, LOUDSPEAKER FEEDBACK381/121FeedbackExaminersPrimary: Dwyer, James L.Assistant: Chiang, Jack Attorney, Agent or FirmForeign Patent References
International ClassesH03G 005/00H04R 003/00 H03F 021/00 Foreign Application Priority Data1989-12-29 JPAbstractAn acoustic apparatus comprises a cabinet, and a loudspeaker unit having a pair of input terminal, a first and a second driving systems disposed in the cabinet. The acoustic apparatus is driven by an external power amplifier which normally constant-voltage-drives a conventional loudspeaker. The first driving system supplies the entire of a input driving signal to one input terminal of a loudspeaker unit and the second driving system supplies component signals of the input driving signal other than ones in the specific frequency band. As a result, driving systems drive the loudspeaker unit with the component signals of the input driving signal in the specific frequency band in cooperation with the external amplifier.Other References
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