Pressure wave transducing
Patent 4628528 Issued on December 9, 1986. Estimated Expiration Date: 
December 9, 2003. 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.
December 9, 2003. 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 ReferencesInventorsAssigneeApplicationNo. 06/427785 filed on 09/29/1982US Classes:381/335, Plural diaphragms, compartments, or housings181/145, Plural chambers367/137, TRANSMITTER SYSTEMS367/188, Casing or housing381/115, With magnetic microphone381/337, Having acoustic wave modifying structure381/351, Plural chambers381/352, Having internal wave reflecting means381/64Mechanical (e.g., reverberation chamber)ExaminersPrimary: Rubinson, Gene Z.Assistant: Byrd, Danita R. Attorney, Agent or FirmInternational ClassesH04R 3/04 (20060101)H04R 1/28 (20060101) AbstractA loudspeaker driver has its front surface adjacent one end of a low loss acoustic waveguide and its rear surface adjacent to one end of a second acoustic waveguide that is one third the length of the first. The other openings of the waveguides face air and couple acoustical energy substantially uniformly over a relatively broad range of frequencies extenting into the bass frequency region. An equalizer includes a notch filter so that the frequency response of the equalizer below a bass cutoff frequency is sufficiently low to prevent audible distortion.Other References
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