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:
Aug. 20, 2002
Filed:
May. 27, 1997
Ryo Kamiya, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
A plurality of analog signals are subjected to a delta sigma modulation for conversion into respective bitstream data (PDM). The respective bitstream data are weighted for conversion into respective plural-bit PCM data, and then these plural-bit PCM data corresponding to the analog signals are added together. At that time, optional PCM to be mixed with the analog signals may also be added. PCM data resultant from the addition is then subjected to a delta sigma modulation for conversion into bitstream data. In this way, the mixed data is provided as one bitstream data. The mixed data can be coded as PCM data by performing a decimation process on the mixed data. The mixed data can also be provided as analog data by subjecting the mixed data to an analog low-pass filtering process.