Single-chip audio system mixing circuitry and methods

Details Single-chip audio system mixing circuitry and methods Single-chip audio system mixing circuitry and methods

1998-02-26

2001-10-09

Mei, Xu (Department: 2644)

Electrical audio signal processing systems and devices

With mixer

C700S094000

Reexamination Certificate

active

06301366

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATIONS
This application for patent is related to the following applications for patent:
Pending U.S. patent application Ser. No. 08/949,563 entitled “SINGLE-CHIP AUDIO CIRCUITS, METHODS AND SYSTEMS USING THE SAME”, filed Oct. 14, 1997;
AUDIO SPATIAL ENHANCEMENT CIRCUITRY AND METHODS USING THE SAME, U.S. patent application Ser. No. 09/031,156, filed concurrently herewith;
SINGLE-CHIP AUDIO SYSTEM POWER REDUCTION CIRCUITRY AND METHODS, U.S. patent application Ser. No. 09/031,116, filed concurrently herewith;
SIGNAL AMPLITUDE CONTROL CIRCUITRY AND METHODS, U.S. patent application Ser. No. 09/031,439, filed concurrently herewith;
SINGLE-CHIP AUDIO SYSTEM VOLUME CONTROL CIRCUITRY AND METHODS, U.S. patent application Ser. No. 09/031,112, filed concurrently herewith;
OSCILLATOR START-UP CIRCUITRY AND SYSTEMS AND METHODS USING THE SAME, U.S. patent application Ser. No. 09/031,444, filed concurrently herewith.
These applications for patent are hereby incorporated by reference in the present disclosure as fully set forth herein.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates in general to digital data processing and in particular to single-chip audio circuits, methods and systems using the same.
2. Description of the Related Art
The ability to process audio information has become increasingly important in the personal computer (PC) environment. Among other things, audio is important in many multimedia applications, such as gaming and telecommunications. Audio functionality is therefore typically available on most conventional PCs, either in the form of an add-on audio board or as a standard feature provided on the motherboard itself. In fact, PC users increasingly expect not only audio functionality but high quality sound capability.
The key components in most digital audio information processing systems convert input analog audio information into a digital format for processing processor, support sample rate conversion, SoundBlaster compatibility, wavetable synthesis, or DirectSound acceleration, convert outgoing signals from digital to analog format for eventual audible output to the user, and mix analog and/or digital data streams. In conventional systems, these functions must be provided through multiple chip solutions which make board design and fabrication more complex and expensive.
Thus, to meet the demands of increasingly sophisticated computer users, the need has arisen for new circuits and methods for implementing single-chip audio systems and systems using the same. Among other things, such circuits and methods should provide for the implementation of systems for use with high quality sound systems and should support the latest sound processing standards and game designs.
SUMMARY OF THE INVENTION
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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