Freescale Semiconductor,inc.

Silicon Laboratories Inc.

Sigmatel, Inc.

Thomas Glen Ragan

Michael R May

Jon David Hendrix

Carl Alelyunas

Matthew Derrell Felder

Russell Croman

Matthew Brady Henson

Brian Douglas Green

Jing Li

David Anderton

Nicholas R Berkner

Tarang Shah

Yue Zhao

In one embodiment, a noise cancellation circuit includes: a window generator to generate a window having a first set of samples; a band splitter to split the window into pairs of symmetric frequency components; a processing circuit, for each of the pairs, to: compare a first magnitude of a first symmetric frequency component to a second magnitude of a second symmetric frequency component and modify one of the components based at least in part on the comparison; an integrator to integrate the pairs output from the processing circuit; and a second window generator to generate a second window having a second set of samples.

Performing noise cancellation in radio signals using spectral duplication

An apparatus includes a plurality of delay elements, a plurality of multipliers and an accumulator to form a biquad stage; and a precision logic circuit. The biquad stage includes feedback paths; at least one feedback path has an adjustable bit precision; and the precision logic is adapted to regulate the bit precision of the feedback path(s) based at least in part on at least one parameter that is associated with the biquad stage.

Biquad stage having a selectable bit precision

A radio frequency (RF) signal is received in a receiver, and various counts based on information from the signal can be obtained. Counts of a number of samples of the RF signal exceeding first and second thresholds can be accumulated during an accumulation window. From the first of these counts, it can be determined if the count exceeds a first metric corresponding to a first predetermined count value, and if so, a gain of an RF gain element can be reduced. From the second of these counts it can be determined if this count exceeds a second metric corresponding to a second predetermined count value, and if not, the gain can be increased.

Statistical gain control in a receiver

A wireless handset includes a long range wireless transceiver for selectively providing an inbound communication and an outbound communication through a wireless telephone network. A battery monitor module monitors a remaining power of a battery and produces a control signal when the remaining power compares unfavorably to a reserve power threshold. A processing module allows an outbound communication to an allowed recipient when the control signal is asserted, and prohibits an outbound communication to a disallowed recipient when the control signal is asserted.

Wireless handset having selective communication control and corresponding methods

A stereo decoder includes a first digital filter for producing a first filtered composite audio signal and a second digital filter for producing a second filtered composite audio signal. A sum/difference network produces a left channel signal and a right channel signal. A processor executes operational instructions that calculate a first corner frequency of a first digital filter based on a signal quality of the FM signal, calculate a first set of filter coefficients for the first digital filter based on the first corner frequency and an approximation of a filter transform, calculate a second corner frequency of a second digital filter based on the signal quality, and calculate a second set of filter coefficients for the second digital filter, based on the second corner frequency and the approximation of the filter transform.

Radio receiver with stereo decoder and method for use therewith

A receiver includes a mixing module for mixing an input signal by at least one mixing sequence to produce a mixed signal. The mixed signal is filtered to produce a first filtered signal. A first downsampler downsamples the first filtered signal to produce a first decimated signal, wherein the decimation period is not a multiple of the mixing period.

Receiver and methods for use therewith

A method for enabling at least a portion of a multiple function handheld device begins by enabling at least a portion of a digital audio functionality in response to a first mode selection. The method continues by disabling wireless communication functionality in response to the first mode selection.

Multiple function handheld device

A method for reducing adjacent channel interference begins by determining a desired channel of a radio frequency (RF) signal. The method continues by determining a plurality of potential local oscillations for the desired channel. The method continues by determining a proximal power level of an image frequency of each of the plurality of potential local oscillations to produce a plurality of proximal power levels. The method continues by selecting one of the plurality of potential local oscillations for down converting the desired channel based on the plurality of proximal power levels.

Reduced adjacent channel interference in a radio receiver

A radio receiver, optionally used in conjunction with a handheld audio system, includes a radio stage for processing a received radio signal into an audio signal. An audio stage produces an audio output, based on the audio signal. An overload monitor detects an overload condition in the radio stage and generates an overload signal in response to the detected overload condition. A controller controls the audio output in response to the overload signal.

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Austin, TX, United States of America

Thomas Glen Ragan