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. 01, 2003
Filed:
Sep. 17, 1999
Masaki Tsukamoto, Mitaka, JP;
Nippon Columbia Co., Ltd., Tokyo, JP;
Abstract
A digital audio signal distortion detecting device is provided for estimating the distortion based on the linearity error of an analog/digital converter at the time of analog/digital conversion from a digital audio signal converted from analog to digital by the analog/digital conversion having linearity error. This device includes storage means ( ) for storing the digital audio signal, occurrence frequency detecting means ( ) for fetching a plurality of samples from the digital audio signal stored in the storage means ( ) and counting the occurrence frequency of the samples for every code expressing the quantization level of the samples, normalizing means ( ) for extracting distortion characteristics accompanying the linearity error of an A/D converter ( ) from the occurrence frequency for every code detected by the occurrence frequency detecting means ( ) as a normalized occurrence frequency, and error bit detecting means ( ) for detecting an error bit on the basis of the code corresponding to the characteristics of the normalized occurrence frequency.