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:
Feb. 04, 2003
Filed:
Aug. 14, 2001
Yukio Fukuhara, Tokyo, JP;
Akira Toyama, Kanagawa-ken, JP;
Nippon Precision Circuits Inc., Tokyo, JP;
Abstract
A pole-shifted noise shaper whose transfer function has a Z-plane in which the pole has been shifted out of the origin. The noise shaper suppresses idle pattern. The noise shaper has a dither adder ( ) placed immediately before a quantizer ( ) to add a dither signal to data about to be applied to the quantizer ( ). This suppresses attenuation of the dither signal due to noise shaping. Therefore, the dither signal can be supplied effectively. The idle pattern appearing in the output signal can be suppressed. Since the pattern of the dither signal is varied at a frequency that is {fraction (1/16)} to ⅛ of the frequency of the operating clock signal, the frequency of noise component due to the dither signal lowers. The signal and the dither signal component can be easily separated in a rear stage.