Phitek Systems Limited

Slab Dsp Limited

Slab Technology Limited

John Frederick Corey

Mark Donaldson

Christopher Colin Lock

Kelly Charles Waterman

Graeme Oliver Jones

A jack () typically mounted in an aircraft seat is adapted for use with a variety of headset types. A jack has sockets () accepting any of several different types of plugs associated with different types of noise cancellation headsets or aviation industry headsets including one, two, or three pin types. The jack includes sensing components to correctly detect from the number of pins inserted, and the impedance and/or voltages sensed on those pins, the type of headset being used. With this identification, appropriate connections to the audio source as well as to noise cancellation circuitry may be made to enable the headset to function correctly.

Audio jack with plug or head set identification circuit

A jack () typically mounted in an aircraft seat is adapted for use with a variety of headset types. A jack has sockets () accepting any of several different types of plugs associated with different types of noise cancellation headsets or aviation industry headsets including one, two, or three pin types. The jack includes sensing components to correctly detect from the number of pins inserted, and the impedance and/or voltages sensed on those pins, the type of headset being used. With this identification, appropriate connections to the audio source as well as to noise cancellation circuitry may be made to enable the headset to function correctly

A flat panel rectangular or elliptical loudspeaker has one or more anisotropic diaphragms , made of double skinned fluted polypropylene copolymer (core flute) or corrugated cardboards having a longitudinal bending strength greater than the transverse bending strength. The diaphragm is vibrated by a driver unit which comprises a magnet and voice coil . In this version the magnet is mounted on the rear diaphragm and the voice coil is mounted on the front diaphragm . The two diaphragms are mounted at their edges to a frame with the driver unit mounted in the space enclosed by the frame and the diaphragms.

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Auckland, New Zealand

John Frederick Corey