Motorola Corporation

Telex Communications, Inc.

Jason Darrell McIntosh

Peter M Pavlov

William H Robertson, Jr

Julio C Castaneda

Donald W Burnette

David B Cranfill

Graeme Johnson

David M Yeager

Patty Galindo

The embodiments of the invention concern a keypad (). The keypad can include a membrane (), at least one key with at least one flangeto overlap with at least one second flange of a second key (), and at least one audio port opening () in the membrane for providing a passage of air from a transducer () positioned behind at least one key through the keypad to a main volume area (). For example, the audio port opening can be in a region of the membrane between the keys, and the overlapping of the flanges obscures a view of at least one audio port opening.

Keypad with flanged keys for high audio front porting communication products

The invention concerns a method () and system () for suppressing receiver audio regeneration. The method () includes the steps of receiving a communication signal (), at a Radio Frequency (RF) unit (), demodulating the communication signal to an audio signal (), monitoring a volume level of the audio signal (), and shifting the pitch of the audio signal when the volume level reaches a predetermined threshold (), and playing the pitch-shifted audio signal out of a speaker to produce a pitch-shifted acoustic signal (). The method can shift the pitch of the audio signal to produce a pitch-shifted acoustic signal with signal properties suppressing regeneration of the acoustic signal onto the audio signal at the RF unit. The amount of pitch-shifting can be a function of the volume level.

Method and system for suppressing receiver audio regeneration

Adhesively affixed holder for supporting a food/drink container

A speaker () having a diagnostic capability, as well as a circuit () and related methods () for performing speaker diagnostics based upon a driving-point impedance are provided. The speaker includes a flexible cone () and a voice coil () connected to the flexible cone for driving the flexible cone so as to convert electrical signals into sound. The speaker also includes a signal source () connected to the voice coil for supplying a test signal to the voice coil. The speaker further includes a signal sensor () electrically connected to the voice coil for sensing a response signal occurring in response to the test signal. Additionally, the speaker includes a condition determining module () for determining a driving-point impedance based upon the response signal and for comparing the driving-point impedance to a predetermined impedance to thereby determine a condition of the speaker.

Speaker diagnostics based upon driving-point impedance

The invention concerns a method () and a system () for ensuring audio safety in an audio device (). The system includes a processor (), a sensor (), an analog safety circuit () and a first feedback loop (). The processor is programmed to output an acoustic output signal (), the sensor monitors the acoustic output signal and the analog safety circuit is coupled to an output of the processor. The first feedback loop feeds the monitored acoustic signal from the sensor to the analog safety circuit. The analog safety circuit adjusts from a first level () to a second level () the acoustic output signal when the acoustic output signal exceeds a predetermined safety threshold () such that the audio device has an output capacity that is capable of driving a sound pressure level of the acoustic output signal above the predetermined safety threshold.

Method and system for ensuring audio safety

A communication device ( ) includes an earpiece ( ), a sensor ( ), and an active equalization circuit ( ). The earpiece ( ) transmits an acoustic output signal ( ) from the communication device ( ). The sensor ( ) is proximately located with the earpiece ( ) and measures an acoustic pressure ( ) at the earpiece ( ) and generates a response signal ( ). The active equalization circuit ( ) is coupled to the sensor ( ) and equalizes the acoustic output signal ( ) using the response signal ( ).

Communication device with active equalization and method therefor

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. The resultant composite cancellation signal is provided to the speakers in the earcups to cancel noise within the earcups. The broadband analog cancellation is effective to reduce overall noise within the earcup, and the DSP not only provides active control of the analog cancellation loop gain to maximize the effectiveness of the broadband analog cancellation but also uses the adaptive feedback filter/algorithm to substantially reduce at least the loudest tonal noises penetrating the earcup, including engine and propeller noises, as well as harmonic vibrations of components of the aircraft's fuselage.

Active noise cancellation aircraft headset system

A video monitor assembly incorporating a microphone shielded from electromagnetic interference emitted by the monitor's electronic components. The assembly includes a video monitor having a housing with a microphone port and an interior cavity containing electronic components emitting electromagnetic interference. A microphone is mounted within the housing, the microphone being capable of detecting at least a portion of the electromagnetic interference emitted by the electronic components of the monitor. A shroud is secured within the housing, the shroud being made from an electromagnetic interference shielding material and at least partially surrounding the microphone to substantially reduce the microphone's detection of the electromagnetic interference emitted by the electronic components of the monitor.

Growing community of inventors

Weston, FL, United States of America

Jason Darrell McIntosh