Silicon Laboratories Inc.

Freescale Semiconductor,inc.

Motorola Corporation

Cirrus Logic Inc.

Junsong Li

Raghu G Raj

Jon David Hendrix

Yui-Luen J Ho

Charles Eric Seaberg

Rahul Gawde

Azfar Inayatullah

Michael R May

Tejasvi Das

John M Khoury

Siddharth Maru

Yan Zhou

Jie Su

Matthew Beardsworth

Eric B Smith

Gregory Charles Yancey

Nariankadu Datatreya Hemkumar

Carlos Jesus Briseno-Vidrios

Younes Djadi

Wai-Shun Shum

Michael Allen Kost

Mark May

Sachin Deo

John Allen

Bradley A Banks

Ronald Wang

Franz Weller

A method may include receiving an input signal, generating a baseline signal based on the input signal, generating a corrected input signal by subtracting the baseline signal from the input signal, determining a threshold level change of the input signal when the corrected input signal exceeds a level change threshold, and responsive to the threshold level change, updating the baseline signal to the level change threshold.

Baseline calculation for sensor system

A multicore processor may include a plurality of cores including at least a first core and a second core, a shared peripheral comprising a plurality of interrupt register banks including at least a first interrupt register bank dedicated to the first core and a second interrupt register bank dedicated to the second core, and a plurality of communications bridges, including at least a first bridge interfaced between the first core and the shared peripheral and at least a second bridge interfaced between the second core and the shared peripheral. The first core may be configured to program the first interrupt register bank via the first bridge to configure the shared peripheral for access by the first core. The second core may be configured to program the second interrupt register bank via the second bridge to configure the shared peripheral for access by the second core.

Systems and methods for context-dependent multicore interrupt facilitation

A control method for a user interface system may include receiving an input signal, receiving a temperature signal indicative of a temperature, generating a baseline signal based on at least one among the input signal and the temperature signal, calculating an error signal based on a difference of the input signal and the baseline signal, and modifying the baseline signal based on the error signal.

Baseline estimation for sensor system

In one embodiment, an apparatus includes: a first demodulator to demodulate a digital signal into a first demodulated audio signal; a second demodulator to demodulate an analog signal into a second demodulated audio signal, the first and second demodulated audio signals including common content; and a delay determination circuit to determine a delay value between the common content of the two demodulated audio signals based at least in part on a first delay estimate having a first resolution and a second delay estimate having a second resolution.

Seamless linking of multiple audio signals

In one aspect, a tuner includes an analog front end to receive a radio frequency (RF) signal and to downconvert the RF signal to a second frequency signal, a digitizer to convert the second frequency signal to a digitized signal, a channel equalizer including a filter to filter the digitized signal, and a first controller to update the filter according to a frequency response of the filter.

Updating a filter of an equalizer

Radio frequency (RF) receivers having whitened digital frame processing and related methods are disclosed. Disclosed embodiments whiten frequency domain interference generated periodic current pulses from by digital frame processing by applying a variable time delay to the frame control signals that initiate digital frame processing. For one embodiment, the variable time delay is achieved by waiting a variable number of digital clock cycles for each digital frame processing cycle. Still further, a variable number of no operation (NO-OP) cycles can be performed at the beginning of each frame processing cycle to provide the variable time delay for the variable number of digital clock cycles. Other variable time delay techniques could also be utilized while still taking advantage of the whitened digital frame processing embodiments described herein.

Radio frequency (RF) receivers having whitened digital frame processing and related methods

In an embodiment, an apparatus includes a first signal path to receive and process a radio frequency (RF) signal of a first band and which has a first programmable digitizer to convert the RF signal of the first band into a digitized signal without downconversion. In addition, the apparatus further includes a second signal path to receive and process an RF signal of a second band, where at least portions of one or more of the paths may be shared during operation in the different bands.

Efficient dual channel conversion in a multi-band radio receiver

In one embodiment, a method includes determining in a controller of a radio receiver whether at least one blocker signal is present in a blocking spectrum surrounding a desired radio channel. If no blocker signal is present, a channel filter of a signal processing path of the radio receiver may be controlled to operate at a first bandwidth. If a first blocker signal is present, the channel filter may be controlled to operate at a second bandwidth less than the first bandwidth. If the first blocker signal and a second blocker signal are present on opposing sides of the desired radio channel, the channel filter may be controlled to operate at a third bandwidth less than the second bandwidth, when a beating signal based on the first and second blocker signals is greater than a threshold level.

Controlling filter bandwidth based on blocking signals

One aspect of the present invention is directed to an apparatus to perform impulse blanking of a received signal at multiple locations of a signal processing path. To effect such impulse blanking, multiple impulse detectors and blankers may be present, in addition to other circuitry. The impulse detectors may operate at different bandwidths, and the impulse blankers may be located at different locations of the signal processing path and may be differently configured.

Performing impulse blanking based on blocker information

In one embodiment, a method for processing radio frequency signals includes estimating an average value of a demodulated signal and a noise signal, both obtained from a radio frequency signal, estimating a noise floor based on the noise signal, generating a blend control signal based on the average values and the noise floor, and blending at least two path signals based on the blend control signal to obtain a blended signal. This blended signal may be output for further processing when multipath noise is detected.

Mitigating radio receiver multipath noise

In one embodiment, a receiver includes parallel paths for signal channel processing and image channel processing. The paths may include a mixer to receive an intermediate frequency (IF) signal and to downconvert the IF signal to a channel baseband signal, a filter to generate a filtered channel value, a combiner to combine the channel baseband signal with a filtered channel value from the other path to obtain a channel path output, in addition to one or more controllers to generate a step control signal and update a weighting of the filters based at least in part on the step control signal.

Controllable image cancellation in a radio receiver

One aspect of the present invention is directed to an apparatus to perform impulse blanking of a received signal at multiple locations of a signal processing path. To effect such impulse blanking, multiple impulse detectors and blankets may be present, in addition to other circuitry. The impulse detectors may operate at different bandwidths, and the impulse blankers may be located at different locations of the signal processing path and may be differently configured.

According to one aspect of the present invention, an apparatus is provided to enable weather band radio signals to be received and processed using a digital signal processor (DSP). The DSP can include functionality to implement both frequency modulation (FM) demodulation and weather band data demodulation, i.e., specific area encoding (SAME) demodulation. In one such embodiment, soft decision samples of a SAME message can be combined, and based on a combined result, a hard decision unit can generate a bit value of weather band data.

Combining soft decisions in a weather band radio

In one embodiment, the present invention includes a digital mixer to receive and digitally mix incoming weather band radio data with a control signal, a digital demodulator to demodulate the data to obtain a demodulated signal, and a digital feedback loop coupled between the demodulator and the digital mixer. The digital feedback loop includes a loop filter to receive the demodulated signal and to generate a filtered output and a fine tune controller to receive the filtered output and a frequency control signal and to generate the control signal based on them. In this way, audible artifacts caused by a frequency step change occurring in an analog front end to which the digital circuitry is coupled can be reduced or removed.

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Austin, TX, United States of America

Junsong Li