Abstract: An electrostatic speaker device, comprising a first stator which is substantially acoustically transparent to audio output and a second stator spaced from the first stator at a distance which defines a charge capacitive region between the first and second stators which operates as an electrostatic field capable of driving a charge sensitive diaphragm as a speaker element. At least one charge sensitive diaphragm is sandwiched between the first and second stators and includes a conductive layer for being responsive to the electrostatic field. Support structure is coupled to at least one of the first and second stators and is attached at a portion of a perimeter of the diaphragm in a manner that imposes tension across the diaphragm to enable the first and second stators to drive the diaphragm as the speaker element.

Abstract: An ultrasonic emitter device having broad frequency range capacity with relatively large diaphragm displacement compared to typical electrostatic diaphragm movement. The device includes a core member able to establish a first magnetic field adjacent the core member and a movable diaphragm stretched along the core member and displaced a short separation distance within a strong portion of the magnetic field. At least one, low mass, planar, conductive coil is disposed on the movable diaphragm and includes first and second contacts for enabling current flow through the coil. A variable current flow to the at least one coil provides a second magnetic field which variably interacts with the first magnetic field to attract and repel the diaphragm at a desired frequency for development of a series of compression waves which may be adjusted to include an ultrasonic frequency range.

Abstract: The present invention is embodied in a method and apparatus for eliminating audio feedback which includes an active microphone coupled to an amplifier which transmits signals received at the active microphone to a parametric speaker for broadcasting. The apparatus comprises at least one transducer for detecting at least one sonic frequency and generating an electrical signal representative of the at least one sonic frequency, a processor for receiving the electrical signal and generating a first ultrasonic frequency which has modulated thereon the at least one sonic frequency, a parametric demodulator for recovering the at least one sonic frequency from the first ultrasonic frequency, and a speaker for directly emitting the at least one sonic frequency.

Abstract: An ultrasonic emitter device having broad frequency range capacity with relatively large diaphragm displacement compared to typical electrostatic diaphragm movement. The device includes a core member able to establish a variable magnetic field adjacent the core member. A movable diaphragm is stretched along and displaced a short separation distance from the core member to allow an intended range of orthogonal displacement of the diaphragm within a strong portion of the magnetic field. At least one conductive ring disposed on the movable diaphragm within the influence of the variable magnetic field of the core member for enabling current flow through the ring for developing a second magnetic field which interacts with the first magnetic field to repel and relax the diaphragm at a desired frequency for development of a series of compression waves which may be adjusted to include an ultrasonic frequency range.

Abstract: An ultrasonic emitter device for converting electrical signals to audio output by acoustic heterodyning of ultrasonic emissions. The device comprises a rigid core member having a top surface which includes an array of cavities of predetermined size and means for enhancement of at least one resonant frequency operable as a carrier frequency within an ultrasonic frequency range. An electrostatic field is generated at the top surface of the core member, and operates with respect to a resilient, dielectric diaphragm disposed in tension along the top surface and across the cavities to allow an intended range of orthogonal displacement of emitting sectors of the diaphragm positioned over the cavities and within a strong portion of the electrostatic field. A conductive medium is applied to one face of the diaphragm and is electrically isolated from the core member.

Abstract: A rugged telephone antenna device for transmitting a short pulse duration signal of predetermined radio frequency that eliminates a trailing antenna resonance signal. The device includes a flexible or protected gas filled tube; a voltage source for developing an electrically conductive path along a length of the tube corresponding to a resonant wavelength multiple of the predetermined radio frequency; and a signal transmission source coupled to the tube for supplying a radio frequency signal to the conductive path for antenna transmission. A method for transmitting a short pulse signal without a trailing residual signal is also provided.

Abstract: A method and apparatus for reducing acoustic noise waves in the vicinity of an electrically conductive plasma, such as in the exhaust of a gas turbine engine, having a sensor to detect the noise wave and generate a representative electrical noise signal; a signal analyzer to analyze the noise signal, a wave form generator to generate a phase inverted, electrical interference signal based on the noise signal, an amplifier, a time delay, an error corrector; and an applying means to conduct the electrical interference signal to the plasma causing the plasma to generate a pulsating interference wave to cancel the acoustic noise wave.

Abstract: A system of GPS devices which receive civilian GPS signals and provide an intuitive graphical interface for displaying the relative position of GPS devices in relation to each other, the relative position being accurate to several meters and defined as the distance to, direction of and height variance between GPS devices. A first GPS device with the person or object to be located transmits its GPS determined location to a second GPS device. This second GPS device includes a means for receiving the GPS determined position of the first GPS device, and also includes means for calculating the relative position of the first GPS device relative to the second GPS device based on a comparison of the received telemetry of the first GPS device and its own GPS determined position. The relative position of the first device is then graphically displayed on an interface of the second GPS device in a manner which eliminates the need for a map in order to travel to the location of the first GPS device.

Abstract: In a total hip replacement, a stem of a femoral component is disposed in a patient's thigh bone with a ball extending in such femoral component above the stem. The ball is disposed in a hemispherical cup positioned in the patient's pelvis and enveloping the ball for frontal movement of the ball relative to the cup. A low-friction liner (e.g., plastic or ceramic) is disposed at the bottom of the cup. To determine whether the ball is properly positioned in the cup, a first member (e.g., a coil) is disposed on the bottom of the liner. A second member (e.g., a patch defining a loop) is disposed on the patient's thigh in operatively coupled (e.g. magnetic) relationship to the first member. The operative coupling between the members is variable in accordance with variations in the disposition of the ball in the cup. When the first and second members are respectively a coil and a patch, the coil and a capacitance may be fixed in the patient's body in a circuit resonant at a particular frequency.

Abstract: The present invention is the emission of new sonic or subsonic compression waves from a region resonant cavity or similar of interference of at least two ultrasonic wave trains. In one embodiment, two ultrasonic emitters are oriented toward the cavity so as to cause interference between emitted ultrasonic wave trains. When the difference in frequency between the two ultrasonic wave trains is in the sonic or subsonic frequency range, a new sonic or subsonic wave train of that frequency is emitted from within the cavity or region of interference in accordance with the principles of acoustical heterodyning. The preferred embodiment is a system comprised of a single ultrasonic radiating element oriented toward the cavity emitting multiple waves.

Abstract: A toy device for simulating a weapon which comprises a toy body having a configuration which supplies a directional orientation for aiming the toy body at a target and a parametric speaker. The parametric speaker generates at least one new sonic frequency from at least two ultrasonic frequencies of different value, and projects them directionally toward the targeted area. The speaker comprises i) an ultrasonic frequency generator; ii) a sonic frequency generator; iii) modulating means coupled to the ultrasonic frequency generator and the sonic frequency generator for producing the at least two ultrasonic frequencies of different value; and iv) at least one ultrasonic frequency emitter coupled to the modulating means and aligned for transmission with the directional orientation of the toy body for propagating the at least two ultrasonic frequencies and concurrently generating the new sonic frequency with directional sound transmission orientation toward the target.

Abstract: A sound projection device for use in speaking to one or more specific persons on a selective basis, the device including a housing having a directional aspect for aiming the housing at a target area, a gripping handle coupled to the housing to enable the device to be held in a user's hand, and a parametric speaker coupled to a front end of the housing for indirectly generating at least one new sonic frequency from at least two ultrasonic frequencies of different value. The housing includes a luminating source having a directional orientation substantially aligned with the directional aspect of the housing. The combination of light and directional sound source enables the user to visually identify the target area before transmitting the sonic frequency to the target.

Abstract: An ear-mounted microphone device configured for being supported in the ear. The microphone device includes a microphone element contained within a housing which is configured at one end to be mounted at a user's ear canal. When the housing is so mounted, the microphone element is positioned closely adjacent to the user's head such that the housing and the user's head cooperatively alter the sensitivity of the microphone so as to provide an enhanced directional orientation and sensitivity of the microphone element toward the user's mouth to a greater degree than is provided when the housing and microphone element are not mounted at the ear canal, so as to enhance pickup of the user's voice. A speaker element may be included within the ear device and can be decoupled mechanically by a gasket bridge between the housing and microphone so as to avoid feedback.

Abstract: A system of GPS devices which receive civilian GPS signals and provide an intuitive graphical interface for displaying the relative position of GPS devices in relation to each other, the relative position being accurate to several meters and defined as the distance to, direction of and height variance between GPS devices. A first GPS device with the person or object to be located transmits its GPS determined location to a second GPS device. This second GPS device includes a means for receiving the GPS determined position of the first GPS device, and also includes means for calculating the relative position of the first GPS device relative to the second GPS device based on a comparison of the received telemetry of the first GPS device and its own GPS determined position. The relative position of the first device is then graphically displayed on an interface of the second GPS device in a manner which eliminates the need for a map in order to travel to the location of the first GPS device.

Abstract: A system of devices both capable of receiving civilian GPS signals, but also capable of providing a relative distance and direction indication that is accurate to several meters. A first device would be capable of transmitting its GPS determined position to a second device. The second device would include a means for receiving the GPS determined position of the first device, and would also include means for calculating the relative distance and direction between the first and second devices. The system would further include the ability of the first device to selectively transmit telemetry at a desired frequency. By providing the second device with the ability to selectively tune a receiver to receive a telemetry signal broadcast by different devices, a distance and direction to a plurality of first devices is possible.

Abstract: An antenna device for transmitting a short pulse duration signal of predetermined radio frequency that eliminates a trailing antenna resonance signal. The device includes a gas filled tube; a voltage source for developing an electrically conductive path along a length of the tube corresponding to a resonant wavelength multiple of the predetermined radio frequency; and a signal transmission source coupled to the tube for supplying a radio frequency signal to the conductive path for antenna transmission. A method for transmitting a short pulse signal without a trailing residual signal is also provided.

Abstract: A record/playback device for use with a removable, interchangeable, flash memory recording medium which enables extended recording comparable with tape cassette dictating equipment. The device includes a housing, a microphone element, control circuitry and a switch mounted on the housing for selecting desired functional operations. A receiving socket is coupled to memory circuitry associated with the control circuitry and is configured for electrical coupling with a flash memory module adapted for receiving and retaining recorded digital information for storage in nonvolatile forme.

Abstract: An ear piece device configured for being supported in the ear and providing a microphone which primarily detects only sounds originated by the user is contained within a housing which is configured at one end to fit snugly at the ear canal of the user, but not to extend within the ear canal. A microphone element is coupled within the housing in a position such that the microphone element is separated from contact with the skull of the user by the housing. This microphone element is contained within a case which is mechanically and acoustically isolated from vibrations occurring within the housing. A support gasket formed of acoustical absorbing materials is interposed around the microphone case forming a bridge between the housing and the microphone case and contained active element.

Abstract: An ear piece device configured for being supported in the ear and providing a microphone which primarily detects only sounds originated by the user is contained within a housing which is configured at one end to fit snugly at the ear canal of the user, but not to extend within the ear canal. A microphone element is coupled within the housing in a position such that the microphone element is separated from contact with the skull of the user by the housing. This microphone element is contained within a casement which is mechanically and acoustically isolated from vibrations occurring within the housing. Mounting rings formed of acoustical absorbing materials are interposed around the casement and between the housing and casement in a displaced configuration on opposing ends of the casement to result in cancellation of residual vibrations passing to the microphone element from the housing. A speaker element may be included within the ear device and can be decoupled acoustically so as to avoid feedback.

Abstract: A radio frequency receiving device which is totally self contained and is fully supported at a diverging opening of a user's ear extending from the ear canal. The device includes an elongate casement having a lower portion and an upper portion at a total length of less than two inches. The casement is constructed of a top portion and a bottom portion, the top portion being deflected from the bottom portion by an acute angle whose value is between the range of 10 to 30 degrees. The bottom portion includes a speaker device mounted at a proximal side thereof and being configured to frictionally fit at the diverging ear opening in close proximity to the skull, with the upper half resting against the ear or being in frictional contact with an upper lip of the ear extending from the top cartilage. The device includes a printed circuit board contained within the casement, a battery compartment, on/off power and volume switches and a tuning circuit for providing selection of desired frequency.