The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 30, 2003
Filed:
Feb. 26, 1998
Jeff Klaas, Austin, TX (US);
Phillip Matthews, Austin, TX (US);
Cirrus Logic, Inc., Austin, TX (US);
Abstract
An audio system includes circuitry for generating an audio data stream and circuitry for generating digital words defining a volume control level. System also includes volume control circuitry for controlling the amplitude of the audio data stream in response to the digital words. Volume control circuitry includes a master register for holding digital words received from circuitry for generating and a slave register for holding a digital word selectively transferred from master register in response to an enable signal. Output control circuitry and receive the audio data stream and apply a preselected gain defined by the digital word held in slave register . Volume control circuitry also includes circuitry for generating the enable signal when a digital word held in the master register changes and the audio data stream output from ouput control circuitry reaches a zero crossing.