Abstract: A wireless communication system for use in aircraft includes a wireless headset having at least one ear cup with a housing. A first ultra wideband transceiver is disposed in the ear cup housing. A base station includes a second ultra wideband transceiver. The second ultra wideband transceiver wirelessly communicates with the first ultra wideband transceiver.
Type:
Application
Filed:
July 7, 2008
Publication date:
January 7, 2010
Applicant:
Telex Communications, Inc.
Inventors:
Lalin S. Theverapperuma, Darcy Zehnder, Talal Aly-Youssef
Abstract: A flush mountable ceiling speaker (10) with individual coaxial waveguides (20, 22) for both the lower and high-frequency transducers (11, 12). The lower frequency radiation is combined with the sonic energy radiated by the high-frequency transducer (12) and shaped by the high-frequency waveguide (20) to create a coherent, uniformly controlled coverage pattern. The loudspeaker (10) creates a well defined sound dispersion pattern over a relatively large bandwidth, resulting in increased vocal intelligibility and more accurate reproduction of music at relatively great distances from the loudspeaker, as is particularly useful in association with high ceiling installations.
Type:
Application
Filed:
March 31, 2003
Publication date:
September 30, 2004
Applicant:
Telex Communications Inc.
Inventors:
William James Gelow, Christopher Sean Beckett
Abstract: A headset is disclosed having a headband configuration that distributes the compression forces on the user's head to provide firm placement without causing discomfort to the user. The headband is preferably integrally formed with a soft overmold molded along a portion of its interface with the user's head. The headband terminates in first and second ends. Either or both ends may terminate in a flared temple pad for further distribution of compression forces or may terminate in an earphone. A boom is pivotally connected to either a temple pad or an earphone and is optionally conformable for positioning towards the wearer's mouth. The boom terminates in a microphone.
Abstract: A one-piece multi-element directional Yagi-Uda antenna comprised of an array of director elements, a reflector element, boom and folded dipole driven element is fabricated from a single piece of conductive material. The method of forming the antenna uses simple, low-cost techniques, such as single and progressive die stamping, punching and forming. The dipole driven element of the antenna is formed by folding the ends of the driven element during the stamping process or in a separate folding step. In an alternative embodiment of the invention, the boom of the antenna array is formed with sufficient length to operatively connect a radome thereto.
Abstract: To transmit encoded information such as for example voice messages between remote transceivers, a transmitter digitizes and encodes an audio signal and then transmits the resulting digital coded signal to the receiver. The receiver decodes the signal and converts it back to an audio signal. The received encoded digital signal is used to reset the timing clock in the receiver so that the timing is synchronized in the receiver and transmitter by the transmitted encoded information. The encoder transmits digital information to a shift register. Encoding switches select certain stages of the shift register and the transmitter transmits the exclusive-OR of the digitized message and the output of the selected stages. This signal is also the input to the shift register. The information transmitted to the receiver is a scrambled digital signal.
Type:
Grant
Filed:
February 26, 1997
Date of Patent:
April 16, 2002
Assignee:
Telex Communications, Inc.
Inventors:
Keith E. Jenkins, Robert B. Basine, LaRhue G. Friesen
Abstract: An active noise cancellation aircraft headset system. A speaker is mounted within each earcup of a headset for receiving and acoustically transducing a composite noise cancellation signal. A microphone is also mounted within each earcup for transducing acoustic pressure within the earcup to a corresponding analog error signal. An analog filter receives the analog error signal and inverts it to generate an analog broadband noise cancellation signal. The analog error signal is also provided to an analog to digital converter, which receives the analog microphone error signal and converts it to a digital error signal. A DSP takes the digital error signal and, using an adaptive digital feedback filter, generates a digital tonal noise cancellation signal. A digital to analog converter then converts the digital tonal noise cancellation signal to an analog tonal noise cancellation signal so that it can be combined with the analog broadband noise cancellation signal.
Abstract: An inexepensive diversity receiver compares the received signal strength signal with a threshold value. When the received signal falls below the threshold value a signal is transmitted through a conductor and a delay circuit to a NAND gate. If the signal is applied to the the two inputs of the NAND gate at the same time, the output of the NAND gate switches a bistable flip-flop which in turn connects or disconnects a second antenna that is 180 degrees in phase from the first antenna between a state in which the signals from the two antenna is combined and a state in which they are not combined and only one antenna applies signals to the receiver.
Abstract: A time division multiplexing ("TDM") digital matrix intercom system for connecting intercom stations. The system includes a digital switching system receiving audio input communications signals from at least some of the intercom stations, and sending audio input communications signals to at least some of the intercom stations. The digital switching system includes a TDM system for broadcasting on a TDM bus multiple digital communications signals including such digital audio input signals. The TDM system includes one or more interfaces connecting intercom stations with the TDM bus.