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:
Jun. 11, 1991
Filed:
Mar. 29, 1989
Kazuo Konishi, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Kanagawa, JP;
Abstract
A digital peak noise reduction circuit for reducing peak noise of an input digital signal having variable levels corresponding to a predetermined sound volume range. The circuit includes a division circuit for dividing the level of the input signal; a ROM for supplying a plurality of data expansion rates, each expansion rate being defined by a relationship between a different specific range of input digital signal level and the predetermined range; a multiplier for multiplying the digital audio data with the reciprocal related data output from the ROM; a multi-stage shift circuit for supplying a plurality of data compression rates, (each compression rate correspond to the expansion rates of the ROM) and for producing an output signal having a level corresponding to the selected compression rate; a de-emphasis circuit for compensating for specified frequency characteristics of the output signal; and a feedback circuit for supplying the output signal to the division circuit for controlling the ROM.