Assignee: Knowles Electronics, Inc.

Location: Itasca, IL
No. of patents: 26

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Number	Title	Issue Date
7065220	Microphone array having a second order directional pattern A directional microphone system is disclosed, which comprises circuitry for low pass filtering a first order signal, and circuitry for high pass filtering a second order signal. The system further comprises circuitry for summing the low pass filtered first order sig...	06/20/2006
6985598	Programming system for programming hearing aids A system for programming hearing aids utilizing a multi-electrode programming strip. The strip is removably attached to a connector and inserted into the aid through a narrow slot in the faceplate; the slot is bounded by the faceplate and by one of the edges of the ...	01/10/2006
6654477	Receiver and method of construction A receiver for converting electrical energy to acoustical energy, and a method of manufacturing the receiver, are disclosed. The receiver comprises an armature having a peripheral edge, a magnet stack and a weld joint for attaching the armature to the mag...	11/25/2003
6130953	Headset A headset including a housing, a resilient, convex headband fixed to the housing, an earphone fixed to the housing and displaceable relative to one end of the headband and a microphone fixed to a swivel arm that is on the housing. The headband has two spa...	10/10/2000
6041131	Shock resistant electroacoustic transducer The present invention relates to a hearing aid receiver (10) having a coil (12) with a tunnel (14) therethrough, a magnetic structure (16) having a central magnetic gap (18), an armature (20), and a fluid (30, 32) with a viscosity greater than air to prov...	03/21/2000
6028502	Potentiometer detent A potentiometer is disclosed that provides a user with tactile feel while making adjustments. The potentiometer includes a housing having a central bore with a rotor extending therein. A knob having a protrusion is operably connected to the rotor along wi...	02/22/2000
5990425	Programmable electrical switch A programmable electrical switch having a housing and a plurality of single-switch-position conducting leads which are positioned in two substantially aligned rows is disclosed. Each of the leads has a proximal end that is disposed within the housing and ...	11/23/1999
5960093	Miniature transducer A miniature transducer such as for an in-the-canal hearing aid, is disclosed. The transducer comprises a housing formed of a top cup joined to a bottom cup and defines an interior and an exterior. The bottom cup includes a base surface and a plurality of ...	09/28/1999
5870482	Miniature silicon condenser microphone Multiple embodiments of a solid state condenser transducer, and methods of manufacture, are disclosed. The transducer comprises a semi-conductor substrate forming a frame and having an opening, a thin-film cantilever structure forming a diaphragm extendin...	02/09/1999
5861779	Impedance circuit for a miniature hearing aid An impedance matching, reducing, or buffering circuit for permitting smooth signal flow from a first transmission medium to a second transmission medium. The circuit provides a first node adapted for coupling to the first transmission medium and for recei...	01/19/1999
5740261	Miniature silicon condenser microphone A housing for shielding a transducer of the type mounted on a silicon die attached to a flexible circuit. The housing provides a jacket which protects the silicon die from physical damage. The jacket, in cooperation with the top and bottom cups, further p...	04/14/1998
5692060	Unidirectional microphone A unidirectional microphone assembly for receiving sound within a range of sound frequencies is disclosed. The microphone assembly comprises a housing formed of a sound absorbing material. The housing has an outer surface, and a bore extending inwardly al...	11/25/1997
5559892	Impedence buffering MOS circuit with dynamically reduced threshold voltage, as for use in an output buffer of a hearing aid amplifier A buffer circuit, such as for use with a low voltage hearing aid, is disclosed. The hearing aid comprises a microphone, a receiver and an amplifier. The amplifier is disposed between the microphone and the receiver. The buffer circuit has a MOS device inc...	09/24/1996
5490220	Solid state condenser and microphone devices A solid state miniature condenser and condenser microphone of good sensitivity is disclosed. The microphone comprises a fixed perforated backplate that constitutes a fixed electrode in a parallel plate condenser, a diaphragm sensitive to incident sound pr...	02/06/1996
5408534	Electret microphone assembly, and method of manufacturer An electret microphone assembly, such as for a hearing aid comprises an electret microphone having a diaphragm and a charged plate, a substrate spaced from the charged plate, and a wire loop having first and second ends and a mid-portion. The first and se...	04/18/1995
5353244	Computer controlled transversal equalizer An adjustable equalizer network has a series chain of N all pass amplifier stages driving N+1 scaling circuits connected to a final summing circuit that includes circuitry to adjust the frequency response at M+1 frequency control points to obtain a predet...	10/04/1994
5337011	Pre-amplifier A tiny pre-amplifier for a small, low voltage, high impedance signal source, usually an electret microphone, exhibiting near unity gain, has an input cascode stage connected to the microphone and a matched balancing cascode stage; both cascode stages are ...	08/09/1994
5335286	Electret assembly A tiny electret assembly for an electroacoustic hearing aid transducer, either a microphone or a sound reproducer, includes a thin, flexible, planar diaphragm and a planar backplate, the diaphragm and the backplate constituting the electret electrodes. On...	08/02/1994
5319717	Hearing aid microphone with modified high-frequency response A microphone for a hearing aid having a modified high frequency response is disclosed. The hearing aid comprises a hollow housing having an upper wall, a lower wall and a depending wall disposed between the upper wall and the lower wall. The upper, lower ...	06/07/1994
5297075	Computer controlled transversal equalizer An adjustable equalizer network has a series chain of N all pass amplifier stages driving N+1 scaling circuits connected to a final summing circuit that adjusts the frequency response at M+1 frequency control points to obtain a predetermined ripple free m...	03/22/1994
5259035	Automatic microphone mixer An automatic microphone mixer for a multi-microphone audio system in which each microphone audio channel is provided with a control channel including a comparator that compares the microphone output, as an A.C. signal, with a D.C. threshold signal, and th...	11/02/1993
5222050	Water-resistant transducer housing with hydrophobic vent An immersion-resistant housing adapted to receive a vibratable diaphragm spanning the interior of the housing to divide the housing into first and second chambers includes a first port communicating between the first chamber and the exterior environment. ...	06/22/1993
5193116	Hearing and output transducer with self contained amplifier An integrated hearing aid receiver is disclosed. The receiver comprises a housing having first and second outlet ports. Disposed within the housing is a diaphragm defining an output chamber and a motor chamber. An armature is disposed within the motor cha...	03/09/1993
5101435	Combined microphone and magnetic induction pickup system An ear insertable hearing aid having both a miniature microphone and a magnetic induction pickup which can be used simultaneously or alternately. The invention includes a core for the magnetic induction device that maximizes the surface area usable for se...	03/31/1992
5083095	Plural source follower amplifier An amplifier having improved input impedance and reduced susceptibility to power supply ripple, particularly suited for use with a high impedance signal source, utilizes at least two field-effect transistors; the signal source is connected to the gate of ...	01/21/1992
5068901	Dual outlet passage hearing aid transducer An improved high-frequency characteristic is achieved, in an otherwise conventional hearing aid receiver transducer, by connecting each of the acoustic chambers on the two sides of the receiver diaphragm, in the receiver housing, directly through an outle...	11/26/1991

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Assignee: Knowles Electronics, Inc.