Disclosed herein is a communications system implementing a headset wirelessly connected to a half-duplex communications device, such as a two-way radio or a radio-simulating cellular phone. The headset may incorporate a transmit/receive switch wherein a transmit signal is wirelessly transmitted from the headset to the communications device to direct the communications device to enter into a transmit mode. Alternatively, a wireless transmit/receive switch may be implemented separately from the wireless headset, where the wireless transmit/receive switch may be positioned in the proximity of the communications device and the headset and may be engaged by a user to direct the communications device to enter a transmit mode.

Wireless headset for communications device

In a short range radio communication headset, signals transmitted by the short range radio communications are received while direct sounds propagated from an external are detected Then, a digital signal adaptation processing using either received signals or the direct sounds as reference signals are applied, and a ratio between the received signals and the direct sounds is controlled by correlating the reference signals and another one of the received signals and the direct sounds that are not used as the reference signals and extracting necessary components

Communication system using short range radio communication headset

Techniques for wirelessly controlling push-to-talk operation of half-duplex wireless device

An audio system for portable high fidelity reproduction, to provide a sensation of being surrounded by a three-dimensional field of lifelike sound events, comprises a set of miniaturized electro-acoustical devices adapted to each other and for battery-operated high fidelity reproductions and designed to be supported by or built into an interconnecting belt-like garment, so as to be worn in contact with the listener's body without causing any discomfort or encumbrance. The system may further employ one or more pairs of small-size binaural transducers with open-air high fidelity characteristics, and its circuitry is designed for binaural radiation and for optimal frequency response and perfect space reproduction through a given transducer type.

High fidelity stereophonic reproduction system

A fully integrated, low cost, amplified electro-acoustic loudspeaker is disclosed in which an amplifier circuit (30, 130, 230, 330, 930, 1030), radio-frequency receiver amplifier circuit (430, 530), optical receiver amplifier circuit (630, 730), or network based amplifier circuit (830) is directly mounted on the loudspeaker's magnetic assembly (105, 505, 705, 805), contained within the loudspeaker's moving assembly (20, 29, 629, 42, 45, 50, 65), or a combination thereof. The amplified loudspeaker's magnetic assembly (5, 105, 405, 505, 705, 805, 905, 1005) is utilized as an electro-magnetic interference shield and/or a heat dissipating element for the attached electronic circuitry. In selected embodiments of the amplified loudspeaker system, the former (42) containing voice coil (45) is additionally utilized for convection cooling of the amplifier circuit (30, 230) or receiver/amplifier circuit combination (430, 630).

Fully integrated amplified loudspeaker

A headset for use in a voice communication system which provides a common audio signal, such as a radio receiver signal, to a plurality of such headsets. The headset includes an earphone having a double voice coil and an ambient sound microphone arranged to receive sounds from the surrounding environment. One of the voice coils is coupled to the common audio signal, while the other coil receives a signal from the ambient sound microphone to permit simultaneous monitoring of the two signals while preventing undesirable signal interaction.

Benjamin T. Cochran

Papers

Headset having double-coil earphone