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. 14, 2010
Filed:
May. 02, 2005
David Edward Zaucha, Carrollton, TX (US);
Venkateswar Reddy Kowkutla, Plano, TX (US);
Anker Bjørn-josefsen, Lynge, DK;
Lars Risbo, Købernhavn, DK;
Douglas Allen Roberson, Rockwall, TX (US);
Josey George Angilivelil, Sachse, TX (US);
David Edward Zaucha, Carrollton, TX (US);
Venkateswar Reddy Kowkutla, Plano, TX (US);
Anker Bjørn-Josefsen, Lynge, DK;
Lars Risbo, Købernhavn, DK;
Douglas Allen Roberson, Rockwall, TX (US);
Josey George Angilivelil, Sachse, TX (US);
Texas Instruments Incorporated, Dallas TX, unknown;
Abstract
A digital audio processor for a digital audio receiver having an improved automute sequence is disclosed. The digital audio processor includes automute detection circuitry that monitors the amplitude of digital audio signals before and after the application of digital filters by digital audio processing circuitry. The amplitude of the input signals are compared against a first threshold level, while the amplitude of the output signals are compared against a second threshold level. In response to the amplitude of the input signals for all of the audio channels falling below the first threshold for a selected time period, a gain stage in each channel ramps down the volume to a mute level, and pulse-width-modulation circuitry is disabled. If the output signal amplitude falls below a second threshold for a channel, the pulse-width-modulation circuitry for that channel is disabled. Hysteresis for the input signal amplitude is preferably added into the automute exit determination.