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:
Mar. 11, 2008
Filed:
Mar. 20, 2006
Chang Yong Kang, Chandler, AZ (US);
John L. Melanson, Austin, TX (US);
Chang Yong Kang, Chandler, AZ (US);
John L. Melanson, Austin, TX (US);
Cirrus Logic, Inc., Austin, TX (US);
Abstract
Digital to Analog Conversion and sample conversion blocks are combined in order to reduce hardware and/or computational complexity. A novel DSM design is used to perform sample rate conversion. The DSM may also be used to perform other digital filtering functions, thus providing a single hardware/software technique to perform both functions. The invention includes a method and apparatus for converting input data samples provided at a first sample rate to an analog output signal. Input data samples are converted by a Delta Sigma Modulator (DSM) in a Digital to Analog Converter (DAC) to output data samples, where internal states of the DSM are updated at a second sample rate unequal to the first sample rate. At least one internal state of the DSM s modified to account for the time difference in response to a new input sample arriving at a time different from an update of the internal states of the DSM.