Cirrus Logic Inc.

Crystal Semiconductor Corporation

Mark Gentry

Phillip Matthews

Ronald D Malcolm

Jeff Klaas

A single chip audio systemincludes a bus interfacedigital to analog convertersan analog mixerand analog spatial enhancement circuitryDigital to analog convertersconvert digital audio data received through bus interfaceinto analog signals. Analog mixermixes signals received from digital to analog converterswith an analog signal received from an external source. Analog spatial enhancement circuitryenhances first and second mixed analog signals output from analog mixer

Single-chip audio circuits, methods, and systems using the same

Amplitude control circuitry includes a first register for storing received amplitude control data and a second register for storing amplitude control data transfered from first register . Output circuitry controls the amplitude of a received signal in response to amplitude data transferred from second register. A sensor determines when data stored in first register and second register does not match and enables a comparator when data in first register and, second register does not match. Comparator compares a signal output from output circuitry with a reference signal and generates a signal for enabling the transfer of data from first register to second register when the signal output from output circuitry falls within a window defined by the reference voltage.

Signal amplitude control circuitry and methods

A single chip audio system includes a bus interface , digital to analog converters , an analog mixer , and analog spatial enhancement circuitry . Digital to analog converters convert digital audio data received through bus interface into analog signals. Analog mixer mixes signals received from digital to analog converters with an analog signal received from an external source. Analog spatial enhancement circuitry enhances first and second mixed analog signals output from analog mixer

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Austin, TX, United States of America

Mark Gentry