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Audio Signal Processing

Single-chip-audio-system-power-reduction-circuitry-and-methods

Music speech filter

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Double diaphragm electrostatic transducer each diaphragm comprising two plastic sheets having different charge carrying characteristics

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Single-chip audio system power reduction circuitry and methods

Details

Inventors: Matthews, Phillip;
Assignee: Cirrus Logic, Inc. ()
Primary Examiner: Mei; Xu
Assistant Examiner:
Attorney, Agent or Firm: Murphy, Esq.; James J. Winstead Sechrest & Minick

An audio system 100 includes digital-to-analog converters 110 having left and right paths for converting received left and right streams of digital audio data and a plurality of analog data ports for receiving left and right channel streams of analog audio data. Mixer 115 has left and right paths for selectively mixing left and right channel data passed from converters 110 and left and right channel data passed from the analog data ports. Muting circuitry is also provided for selectively muting said right and left channel data to be passed to mixer 115 from converters 110. Circuitry is also included for idling a selected one of the left and right paths of mixer 115 when selected data path to mixer 115 is muted.

DETAILED DESCRIPTION A single chip audio system includes a bus interface, digital to analog converters, analog mixer, and analog spatial enhancement circuitry.
Digital to analog converters convert digital audio data received through bus interface into analog signals.
The 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.
The principles of the present invention substantially meet the demand of increasingly sophisticated computer users for audio subsystems which produce high quality sound.
Additionally, the application of the principles of the present invention allows for the provision of such features as stereo full-duplex coding/decoding, CD differential input, mono microphone input, a headphone output, as well as digital connections to a companion audio controller, as desired.

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