Cirrus Logic Inc.

Krishnan Subramonium

Golam Rasul Chowdhury

Bryan Garnett Cope

Mark Alexander

Kartika Prihadi

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

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.

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Austin, TX, United States of America

Krishnan Subramonium