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:
Feb. 17, 2009
Filed:
Nov. 12, 2004
Thomas Holm Hansen, Værløse, DK;
Anker Bjørn-josefsen, Lynge, DK;
Lars Risbo, Copenhagen, DK;
Douglas A. Roberson, Rockwall, TX (US);
Thomas Holm Hansen, Værløse, DK;
Anker Bjørn-Josefsen, Lynge, DK;
Lars Risbo, Copenhagen, DK;
Douglas A. Roberson, Rockwall, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A multiple-channel audio processor () and an associated plurality of power stages () in an audio system are disclosed. The audio processor () includes a plurality of audio amplifier channels (), each of which includes a pulse-code-modulation (PCM) to pulse-width-modulation (PWM) conversion function (), which generates PWM signals for application to the plurality of power stages (). The audio amplifier channels () each also include an interchannel delay function () for delaying the PWM edges relative to other channels (), for reducing noise. The audio amplifier channels () each also include delay adjust circuitry () for gradually increasing and decreasing the interchannel delay of the channel () on startup and shutdown. This permits a single control terminal (VALID) at the processor to globally enable and disable all of the power stages ().