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:
Jul. 06, 1999
Filed:
Jul. 31, 1997
Masamitsu Hirano, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
A digital-to-analog converting section includes a delta-sigma (.DELTA..SIGMA.) modulator and converts an input digital signal to an analog signal on the basis of delta-sigma modulation of the input digital signal by the delta-sigma modulator. A digital adder is provided, at the input stage of the digital-to-analog converting section, to add an oscillation-preventing direct current value to the input digital signal, and the adder operates to prevent oscillation in the delta-sigma modulating loop when the input digital signal changes from an 'input signal present' state to a 'no input signal' state. Also, an output buffer is provided, at the output stage of the digital-to-analog converting section, to shift the converted analog signal in response to an offset-adjusting current. Thus, the offset adjustment can be effected without adversely influencing the oscillation-preventing action of D.C. dithers.