Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Thermal response to – or generation of – sound vibration
Patent
1995-12-27
1998-05-05
Tran, Sinh
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Thermal response to, or generation of, sound vibration
381160, 381 91, 381169, H04R 2500
Patent
active
057487570
ABSTRACT:
An acoustic signal receiving apparatus comprising a housing having an acoustically reflecting surface and a directional acoustic sensor unit having first-order gradient characteristics. The sensor unit is coupled to the housing with use of a retractable member having a retracted position and an extended position. When the member is extended, the sensor unit is positioned relative to the reflecting surface such that the acoustic interaction between the sensor unit and the reflecting surface causes the output of the sensor unit to have second-order gradient response characteristics. In accordance with one illustrative embodiment, in a notebook computer with a "flip-back" lid, the sensor element automatically extends to the desired position when the lid is opened, and automatically retracts to be flush with the housing surface when the lid is closed.
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"Image-Derived Second-Order Differential Microphones", Elko, G.W., West, J.E., Kubli, R.A., J. Acoust. Soc. Am. 95(4), Apr. 1994, pp. 1991-1997.
Kubli Robert Alfred
West James Edward
Brown Kenneth M.
Lucent Technologies - Inc.
Tran Sinh
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