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:
Oct. 21, 2008
Filed:
Jul. 12, 2007
Fumihito Inukai, Kyoto, JP;
Hitoshi Kobayashi, Osaka, JP;
Fumihito Inukai, Kyoto, JP;
Hitoshi Kobayashi, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
By using a selector, an output of a delta sigma modulator having a quantizer for quantizing a signal is selectively supplied to one of a first D/A converter having a linear amplifier and a second D/A converter having a digital amplifier. Further, the number of quantization levels of the quantizer, the sampling frequency, or the order of a transfer function of the delta sigma modulator is selected by a control signal selector in conjunction with the selector. An output of the first D/A converter is supplied to a line terminal, while an output of the second D/A converter is supplied to a headphone terminal.