Shure Acquisition Holdings, Inc.

Motorola Corporation

Motorola Mobility LLC

Robert Szopko

Robert Mamola

Thomas J Kundmann

Michael Joseph Goodson

Jeffrey Arthur Meunier

Yang Tang

Mark Allen Kenkel

Michael J Alwicker

Adem Celebi

Gregory T Nash

Michael Goodson

Mark B Anderson

Scott A Niemiec

Justin N Annes

A flexible multi-channel diversity wireless audio receiver system for routing, processing, and combining multiple radio frequency (RF) signals containing audio signals received on respective antennas is provided. The wireless audio receiver system provides flexible routing of multiple RF signals in different selectable modes, and low latency uninterrupted reception of signals in harsh RF environments by combining multiple RF signals to maximize signal-to-noise ratio. The audio output may be generated in an uninterrupted fashion and mitigate multipath fading, interference, and asymmetrical noise issues. Received RF signals may also be cascaded by the wireless audio receiver system to allow daisy chaining.

Flexible multi-channel wireless audio receiver system

A wideband tunable combiner system for a dual frequency diversity transmitter is provided that includes a tunable capacitance network. Incoherent RF signals with the same audio signal may be combined with the system into a combined RF signal for transmission on an antenna. The tunable capacitance network, in conjunction with a combiner and a band pass filter, may optimize the isolation between the incoherent RF signals and reduce intermodulation, while maintaining a wide operating bandwidth. The capacitance value of the tunable capacitance network may be selected based on the frequencies of the incoherent RF signals, RF spectrum information, or antenna loading data. An RF transmitter including the tunable combiner system may have improved spectral efficiency and performance and take advantage of available spectrum.

Wideband tunable combiner system

An antenna assembly and method of forming an antenna is disclosed. The antenna comprises a dielectric core wrapped with an antenna tape having a conductive portion. A printed circuit board extends from a chassis, and a ground element secures the printed circuit board to the chassis at a point located away from the chassis. The printed circuit board can be secured to the conductive portion on the tape through a wire or flex cable connection. The dielectric core can be formed of a shock absorbing material and is configured to extend into the chassis. The antenna assembly can be provided with an antenna cover placed over the dielectric core and a shock-absorbing material can be located between the dielectric core and the antenna cover.

Helical antenna apparatus and method of forming helical antenna

A method, apparatus, and electronic device for using digital predistortion are disclosed. A transmittermay transmits a transmission signal. A receivermay monitor the transmission signal to execute digital predistortion of the transmission signal to compensate for distortion. A field programmable gate array or application specific integrated circuitmay adjust a power amplifier bias to improve the digital predistortion.

Method and apparatus for improving digital predistortion correction with amplifier device biasing

An interference cancellerand corresponding method thereof operates to reduce the level of an interfering signal and includes a circulatorcomprising a transmitter port, a receiver port and an antenna port, a transmission linecomprising a first end coupled to the transmitter port and a second end for coupling to a signal source; and a circuit, having an input coupled to the receiver portand an output coupledto the transmission line, for providing a phase shifted version of a signal coupled to the input at the output, wherein an interfering signal at the antenna port is reverse coupled to the transmission line by the circulator and coupled to the input of the circuit so as to reduce an amplitude of the interfering signal at the second endof the transmission line. The interference canceller concepts may advantageously be used in a single transmitter version or in a multiple transmitter version (FIG.).

Method and apparatus for reducing interfering signals in a transmitter

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Downers Grove, IL, United States of America

Robert Szopko