Cirrus Logic Inc.

Arx Fit, Inc.

Mark Alexander

Xue-Mei Gong

Golam Rasul Chowdhury

Bryan Garnett Cope

Kartika Prihadi

Eric Clay Gaalaas

Jay Beaudry

Krishnan Subramonium

John James Paulos

Dylan Alexander Hester

Systems, methods, and devices for measuring force applied to a machine, where an exercise machine comprises a frame; a motor assembly; a mounting plate, wherein the mounting plate is attached to the motor assembly; a force transducer. The force transducer is attached to the mounting plate and the frame and is the only point of contact between the frame and the motor assembly. The force transducer is configured to measure force applied to the motor assembly.

Exercise machine with a force transducer

An attenuator includes a first stagehaving a first operational amplifierand a tapped resistor. Tapped resistorhas an input for receiving input data, an output coupled to an output of first operational amplifier, and a plurality of taps for selectively presenting a sequence of voltages to a noninverting input of first operational amplifier. Each of these sequences of voltages corresponds to an attenuation step such that first stagesteps the attenuation produced by the attenuator from an intermediate value to a predetermined ending value. A second stageincludes a second operational amplifierand a tapped resistor. Tapped resistorincludes an input for receiving analog data from first stage, an output coupled to an output of second operational amplifier, and a plurality of taps for selectively presenting a sequence of voltages to a noninverting input of operational amplifier. Each of the sequence of voltages corresponds to an attenuation step, a second stagestepping the attenuation from a predetermined starting value to the intermediate value.

Multiple stage attenuator

A multi-bit DAC (,) is provided as part of a digital-to-analog data converter (DAC). The multi-bit DAC is comprised of a plurality of single-bit DACs (,) which have the values thereof selected through a digital encoder (,). The digital encoder (,) performs dynamic element matching (DEM) on an input data value. The sequence of selection is performed such that the element mismatch noise response of the DAC (,) is shaped. The outputs are summed at a summing junction (,) and then filtered with a low pass filter (,). In the noise shaping response, a cyclical second order response is provided with a Data Weighted Averaging (DWA) technique wherein the outputs of the DACs are restricted to one of two states. To achieve this, select ones of the output values are changed in order to comply with this restriction, thus deviating from a uniform element selection algorithm. This provides a constrained second order response which accounts for mismatching of the DAC elements (,).

2nd order noise shaping dynamic element matching for multibit data converters

Audio data processing circuitry,includes a plurality of analog inputs,for receiving analog audio data and a digital input,for receiving digital audio data. A analog mixer,mixes analog data received at said plurality of analog inputs,to generate a mixed analog audio stream. An analog-to-digital converter,converts the mixed analog audio stream to a digital audio stream and a digital mixer,mixes digital data received at the digital input,with the digital audio stream from the analog mixer,to generate a mixed digital audio stream.

Circuits and methods for implementing audio Codecs and systems using the same

Digital-to-analog conversion circuitry 100 is shown including a path for processing data in a 1-bit format. First portion of an analog finite impulse response filter 300 includes pre-selected number of delay elements 301 for receiving stream of data in the 1-bit format and outputting a plurality of signals in response. A switched capacitor digital-to-analog converter 106 forms a second portion of the finite impulse response filter 301 and has a plurality of elements each receiving one of the plurality of signals as selected to effectuate a set of filter coefficients, converter 106 summing the plurality of signals and outputting an analog data stream.

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Austin, TX, United States of America

Mark Alexander